Growing Guides

How to Grow Tree Seeds & Shrub Seeds:

Outdoor Planting: If you are planting in an area that drops below freezing in the winter: The best time to plant tree and shrub seeds outdoors is in the spring after the last frost in your area.
If you are planting in an area that does not freeze in the winter: You can plant tree and shrub seeds outdoors at anytime of the year.
Indoor Planting: You can plant tree and shrub seeds indoors anytime during the year - you will need a sufficient heat source (70-75 degrees), growing lights and a seed starting heat mat.

Do your seeds require stratification (pre-treatment)?

Stratification is required for most seeds but not all. Most pine, spruce, cypress, elm, some oak, and other seeds do not require any pre-treatment. Listed below are the stratification requirements for each seed we sell - listed by category in alphabetical order. 

If your seeds do not require stratification/pre-treatment: You can plant your seeds indoors anytime during the year and outdoors in the spring (after the last frost in your area). This is usually after May 15 in most US states and Canada.

If your seeds require stratification: The best time to stratify tree and shrub seeds is in the winter months. If the stratification requirement is: 60-120 days - you should start stratification in January or Feb. You can also put your seeds in the ground during the fall - in September or October (Before the ground freezes). If the ground freezes in your area during the winter months - then your seeds will germinate (sprout) in the spring after the last frost in your area. 

How to: Cold Moist Stratification:

If your seeds require cold moist stratification: You are mimicking the natural winter cycle for seeds. Most seeds fall during the fall months (September to November), then go through winter under soil, leaves and snow. The seed will not germinate until the weather is in the seeds favor to grow. The outdoor growing season for tree and shrub seeds is: May to October. This gives the seedling enough time to grow strong enough to survive the winter weather conditions. 

Stratification Supplies: You will need ziplock bags and Jiffy Seed Starting Mix.

Instructions: Fill a ziplock bag half way with seed starting mix. Add 10-20 seeds (depending on the size of the seed - less for acorns). Shake the bag a few times to make sure the seeds are covered with soil. Add water to keep moist. Place the bag in the bottom drawer of your fridge. Check on your bag once a week to see if you need to add more water to keep the soil moist.

Warm Stratification: What if my seeds require a warm stratification period first? Some seeds such as the White Fringe and Holly - require warm stratification and then possibly cold moist stratification. The warm stratification is required before you start the cold moist stratification. Your seeds will need to be in moist soil in temps of 70-75 degrees for the required time. You can achieve this by filling plastic containers with seed starting mix. Place the seeds barely underneath the top of the soil. We use the dollar store plastic containers. Place the containers on a heat seedling starter mat.

What do I do after the stratification period is finished? If your seeds are finished stratifying - you should plant your seeds immediately either indoors or outdoors. If the weather conditions outdoors are in favor of your seeds then you can plant outdoors either in the ground or in pots/containers. Use seed starting mix. If you are starting your seeds indoors - make sure you have a heat seedling starter mat and a growing light. Tree and shrub seeds are not like vegetable seeds. They are more hardy than vegetable seeds and require direct light/heat to germinate. Most tree seeds will not germinate in a paper cup on the window sill. If your seeds have been stratifying naturally outdoors during the winter - then they will naturally germinate during the spring season.

Other Pre-Treatment Requirements:

Scarification: Some seeds have very hard seed coats and require scarification. Seeds such as Yellowhorn and Redbud require scarification. Scarification is breaking through the seed coat to allow moisture inside the seed embryo. You can achieve this by rubbing your seeds in-between course sandpaper for a few minutes. You can also line a mason jar with sandpaper, add the seeds and shake for 5 minutes. This will help 'nick' the seed coats. Then soak your seeds in water for 24-48 hours. 

High Humidity Germination: (Also called 'Sow Under Glass').

The following seeds require high humidity to germinate: Quaking Aspen, Royal Empress and Sourwood.

Supplies Required: Growing Light, Heat Seedling Starter Mat, Jiffy Seed Starting Mix, Spray Bottle filled with water, Clear salad bowl with lid.

1. Poke a few holes in the lid of the salad bowl.

2. Fill the bowl less than half way with Jiffy Seed Starting Mix.

3. Add water to keep the soil mix moist. Then spray the inside of the container lid and walls with water.

4. Sprinkle 10-20 seeds on the top of the soil mix. You don't need to bury the seeds in the soil or cover the seeds with soil.

5. Place the salad bowl on the heat mat 24 hours a day and under the growing light for 12-14 hours per day.

Your seeds will germinate (sprout) in about 1 week. Watch out for mold forming on the soil. This can happen in a high moisture environment. Mold usually occurs due to over-watering. Keep the soil moist - not soaking wet. Once your seeds sprout - pluck each seed from the bowl and place each seed into its own pot/container. Keep the containers under the growing light and on the heat mat until they are at least 3-6 inches tall. These seeds are tiny so barely cover the seeds with the soil mix. If mold starts before the seeds germinate then pluck the seeds from the soil and start again in a new clean salad bowl.

*Some people prefer to use the plastic vegetable seed growing domes sold in garden stores. These domes are often to big and will not create the high amount of humidity and moisture for these tree seeds to germinate.

Planting tree and shrub seeds is easy and very rewarding once you get the hang of it! Do not over complicate it. Each seed does not have its own set of directions. All seeds are planted the same way. Seeds only need sun (light), heat (warmth) and water to grow into a healthy tree. Keep your supplies clean and don't over water your seeds/seedlings. Keep your seeds happy and they will do magical things for you - like grow into a strong healthy Tree _____________________________________________________________________________________________________________________________________________

Stratification & Pre-Treatment Requirements - Listed by Seed Category/Alphabetical Order

Alder Tree Seeds:

Black Alder: 60-90 days cold moist stratification.

Italian Alder: 30-60 days cold moist stratification.

Mountain Alder: 30 days cold moist stratification

Manchurian Alder: 30-60 days cold moist stratification.

Red Alder: No stratification required.

White Alder: 30-60 days cold moist stratification.

Gray Alder: 60-120 days cold moist stratification.

Aralia Tree Seeds:

Chinese Angelica: 60-90 days cold moist stratification.

Devil's Walkingstick: 60-90 days cold moist stratification.

Ash Tree Seeds:

Common Ash: Seed requires 30-60 days warm stratification followed by 60-120 days cold moist stratification.

Flowering Ash: 30 days warm stratification followed by 90-120 days cold moist stratification.

Green Ash: 60 days warm stratification followed by 120 days cold moist stratification.

White Ash: 60 days warm stratification followed by 120 days cold moist stratification.

Aspen Tree Seeds:

Refer to the 'High Humidity Germination' section above.

Birch Tree Seeds:

Creamy Bark Birch: Refer to the 'High Humidity Germination' section above or  cold moist stratification for 60 days. Slightly bury the seed. Stratified seed will germinate in the dark.

Silver Birch: Same as Creamy Bark Birch.

Asian White Birch: Same as Creamy Bark Birch.

Water Birch: Same as Creamy Bark Birch.

Yellow Birch: 60 days cold moist stratification. Slightly bury the seed. Stratified seed will germinate in the dark.

Whitespire Birch: Same as Yellow Birch.

Sweet Birch: 60 days cold moist stratification.

River Birch: 60 days cold moist stratification and slightly bury the seed.

Paper Birch: 2-3 months cold moist stratification.

Gray Birch: 60 days cold moist stratification.

Korean Birch: 60 days cold moist stratification.

Catalpa Tree Seeds:

Northern Catalpa: None required

Cherry Tree Seeds:

Paperbark Cherry: 60-120 days cold stratification.

Pin Cherry: 60 days warm stratification followed by 90-120 days cold moist stratification.

Weeping Higan Cherry: 30-60 days warm stratification followed by 90-120 days cold moist stratification.

Black Cherry: 30-60 days warm moist stratification followed by 90-120 days cold moist stratification.

Higan Cherry: Same as Black Cherry

Nanking Cherry: 90 days cold moist stratification.

Shining Bark Cherry: Soak seed in water for 48-72 hours then cold moist stratify for 30 days.

Black Chokechery: 30-60 days warm stratification followed by 90-120 days cold moist stratification.

Japanese Flowering Cherry: 30-60 days warm stratification followed by 90-120 days cold moist stratification. Before starting the warm stratification - soak seeds in room temperature water for 48 hours. Change the water after 24 hours.

Sweet Cherry: Same as Japanese Flowering Cherry.

Bird Cherry: 30 days warm stratification followed by 90-120 days cold moist stratification.

Coffee Tree Seeds:

Arabian Coffee: Scarification required.

Crabapple Tree Seeds: 

Sweet Crabapple: 60-90 days cold moist stratification.

Red Sentinel Crabapple: 60-90 days cold moist stratification.

Sargent Crabapple: 60-90 days cold moist stratification.

Siberian Crabapple: 60-90 days cold moist stratification.

Crape Myrtle Tree Seeds:

Common Crape Myrtle: None Required

Cypress Tree Seeds:

American Arborvitae: None Required

Arizona Cypress: 21-30 days cold moist stratification.

Bentham Cypress: None Required

Darjeeling Weeping Cypress: None Required

Italian Cypress: None Required

Modoc Cypress: None Required

Common Bald Cypress: Treat seeds in hot water then 60-90 days cold moist stratification.

Monterey Cypress: 21-30 days cold moist stratification.

Pond Cypress: Hot water treatment then 60-90 days cold moist stratification. 

Dogwood Tree Seeds:

Bentham's Cornel: 30 days cold moist stratification.

Giant Dogwood: 5 months warm stratification followed by 3 months cold moist stratification.

Flowering Dogwood: 90-120 days cold moist stratification.

Gray Dogwood: 60 days warm stratification followed by 60 days cold moist stratification.

Japanese Cornel Dogwood: 150 days cold moist stratification.

Pagoda Dogwood: 60 days warm stratification followed by 60-90 days cold moist stratification.

Redosier Dogwood: 60-90 days cold moist stratification.

Silky Dogwood: 90-120 days cold moist stratification.

Chinese Dogwood: 60-120 days cold moist stratification.

Pacific Dogwood: 90-120 days cold moist stratification.

Elderberry Tree Seeds:

Blue Elderberry: 60 days warm stratification followed by 90-120 days cold stratification.

American Elderberry: 30-60 days warm stratification followed by 90-120 days cold stratification.

European Elderberry: 30 days warm stratification followed by 120-160 days cold stratification.

European Red Elderberry: 30 days warm stratification followed by 120-160 days cold stratification.

Elm Tree Seeds:

American Elm: None Required

Chinese Elm: 30-60 days cold moist stratification.

Siberian Elm: None Required

Royal Empress Tree Seeds:

Refer to the High Humidity Germination section at the top of this page.

Fir Tree Seeds:

Green Douglas Fir: None Required

Balsam Fir: 30-45 days cold moist stratification.

Greek Fir: 21 days cold moist stratification.

Korean Fir: 21-30 days cold moist stratification.

Spanish Fir: 21 days cold moist stratification.

Fraser Fir: 30-60 days cold moist stratification.

Grand Fir: 14-21 days cold moist stratification.

Noble Fir: 30-45 days cold moist stratification.

Pacific Silver Fir: 21-30 days cold moist stratification.

Pindrow Fir: None Required

Red Fir: 30-60 days cold moist stratification.

Blue Douglas Fir: None Required

Veitch Fir: 15-30 days cold moist stratification.

White Fir: 30 days cold moist stratification.

Silver Fir: 30 days cold moist stratification.

Momi Fir: 30-60 days cold moist stratification.

Faber's Fir: None Required

Fringe Tree Seeds:

Chinese Fringe: 3 months warm stratification followed by 3 months cold stratification.

White Fringe: 3 to 5 months warm stratification followed by 2 months cold stratification.

Ginkgo Tree Seeds:

60-90 days cold moist stratification.

Golden Rain Tree Seeds:

Chinese Flame: We recommend a hot water treatment to scarify the seed coat - followed by 60-90 days cold moist stratification.

Golden Rain: We recommend a hot water treatment to scarify the seed coat - followed by 30-90 days cold moist stratification.

Gum Tree Seeds:

Blue Gum: Seed requires scarification before planting.

Red Gum: Scarification required before planting.

White Gum: Scarification required before planting.

Lemon Scented Gum: Scarification required before planting.

Hackberry Tree Seeds:

Chinese Hackberry: 60-90 days cold moist stratification.

Common Hackberry: 60-90 days cold moist stratification.

Southern Hackberry: 60-90 days cold moist stratification.

Hawthorn Tree Seeds:

Green Hawthorn: Acid scarify seeds 1-3 hours followed by 3-4 months cold moist stratification.

Singleseed Hawthorn: Acid scarify seeds 1-3 hours followed by 120 days cold moist stratification.

Black Hawthorn: 3-4 months cold moist stratification.

Downy Hawthorn: 30-60 days cold moist stratification.

Washington Hawthorn: 120 days cold moist stratification.

English Hawthorn: 120 days cold moist stratification.

Kansas Hawthorn: Scarify seeds followed by 120 days cold stratification.

Hemlock Tree Seeds:

Eastern Hemlock: 60-120 days cold moist stratification.

Mountain Hemlock: 28 days cold moist stratification.

Chinese Hemlock: 30-60 days cold moist stratification.

Holly Tree Seeds:

Chinese Holly: 4-6 months warm stratification followed by 120 days cold stratification. Seeds may germinate with only warm stratification.

Mountain Holly: 4-6 months warm stratification followed by 120 days cold stratification.

English Holly: 4-6 months warm stratification followed by 120 days cold stratification.

Possum Haw Holly: 30-60 days warm stratification followed by 90-120 days cold stratification.

American Holly: 1 year warm stratification followed by 90-120 days cold stratification.

Hophornbeam Tree Seeds:

Japanese Hop Hornbeam: 60 days warm stratification followed by 120-140 days cold moist stratification.

Hornbeam Tree Seeds:

American Hornbeam: 60 days warm moist stratification followed by 60 days cold moist stratification.

Heartleaf Hornbeam: 30-60 days warm stratification followed by 60-120 days cold stratification.

European Hornbeam: 30 days warm stratification followed by 90-120 days cold stratification.

Juniper Tree Seeds:

Alligator Juniper: 90-120 days cold moist stratification.

Eastern Red Cedar: 30 days warm stratification followed by 90-120 days cold stratification. We recommend scarification before starting warm stratification.

One-Seed Juniper: 90-120 days cold stratification.

Rocky Mountain Juniper: 45-90 days warm stratification followed by 60-120 days cold stratification.

Utah Juniper: 60-90 days cold moist stratification.

Common Juniper: Hot water treatment then 90-120 days cold moist stratification.

Kentucky Coffee Tree Seeds:

Seed requires scarification before planting.

Larch Tree Seeds:

American Larch: None Required

European Larch: None Required

Western Larch: 21-30 days cold moist stratification.

Japanese Larch: 30 days cold moist stratification.

Lilac Tree Seeds:

Hungarian Lilac: 30-90 days cold moist stratification.

Amur Lilac: 30-90 days cold moist stratification.

Japanese Lilac: 30-90 days cold moist stratification.

Late Lilac: 30-90 days cold moist stratification.

Early Lilac: 30-90 days cold moist stratification.

Common Lilac: 30 days cold moist stratification.

Linden Tree Seeds:

American Linden: 90 days cold moist stratification.

Littleleaf Linden: 90 days cold moist stratification.

Silver Linden: 90 days cold moist stratification.

Locust Tree Seeds:

Black Locust: Scarification required before planting.

Common Honey Locust: Scarification required before planting. Germination trials show the seed germinating with just a 24 hour water soak.

Maackia Tree Seeds:

Amur Maackia: Hot water treatment and then plant. 

Chinese Maackia: Hot water treatment and then plant.

Magnolia Tree Seeds:

Cucumber Magnolia: 90-120 days cold moist stratification.

Southern Magnolia: 90-120 days cold moist stratification.

Sweetbay Magnolia: 90 days cold moist stratification.

Maple Tree Seeds:

Bigleaf Maple: 40-60 days cold moist stratification.

Elegant Maple: 30-60 days cold moist stratification.

Paperbark Maple: Hot water treatment then 60-90 days warm stratification followed by 90-120 days cold stratification.

Snakebark Maple: 60 days cold moist stratification.

Amur Maple: Seed requires a hot water treatment followed by 90-120 days cold stratification.

Full Moon Maple: 60-90 days cold moist stratification.

Lace Leaf Japanese Maple: Hot water treatment followed by 90-120 days cold moist stratification.

Purplebloom Maple: 90-120 days cold moist stratification.

Red Leaf Japanese Maple: Hot water treatment followed by 90-120 days cold moist stratification.

Silver Maple: None required - Soak in room temperature water for 24 hours before planting.

Boxelder Maple: 90 days cold moist stratification.

David Maple: 21-30 days cold moist stratification.

Hedge Maple: 30 days warm stratification followed by 90-180 days cold stratification.

Japanese Maple: 60-120 days cold moist stratification.

Oliver Maple: Hot water treatment followed by 30-60 days cold moist stratification.

Red Maple: 30 days cold stratification.

Rocky Mountain Maple: 180 days warm stratification followed by 180 days cold stratification.

Shantung Maple: 30-60 days cold moist stratification.

Sugar Maple: 60-90 days cold moist stratification.

Tatarian Maple: 90-180 days cold moist stratification.

Trident Maple: 90 days cold moist stratification.

Vine Maple: Hot water treatment followed by 60-90 days cold moist stratification.

Mimosa Tree Seeds:

Scarify the seeds and then plant.

Monkey Puzzle Tree Seeds:

No pre-treatment required. We recommend soaking in water for 24 hours before planting. The Monkey Puzzle is a very slow-growing tree. Seeds can take 2-4 months to germinate.

Mulberry Tree Seeds:

White Mulberry: 60 days cold moist stratification.

Black Mulberry: 60 days cold moist stratification.

Red Mulberry: 60 days cold moist stratification.

Russian Mulberry: 60 days cold moist stratification.

Oak Tree Seeds:

Pin Oak: 60 days cold moist stratification.

Northern Red Oak: 90 days cold moist stratification outdoors or in a fridge.

Sawtooth Oak: 60 days cold moist stratification outdoors or in a fridge.

White Oak: Germinates as soon as it falls from the tree in the fall. Plant outdoors in the fall or spring.

Olive Tree Seeds:

Autumn Olive: 9-12 weeks cold moist stratification.

Russian Olive: 60-90 days cold moist stratification.

Fragrant Tea Olive: None Required

Olive: 4 day water soak followed by 120 days warm stratification then 120 days cold stratification.

Palm Tree Seeds:

Canary Island Date Palm: Soak seed in room temp. water for 1-2 days before planting.

Date Palm: Same as Canary Island Date Palm. 

African Oil Palm: None Required

Mexican Blue Fan Palm: Seed takes 1 to 4 months to germinate. 30 days warm stratification.

Pindo (Jelly) Palm: None Required

Royal Palm: None Required

Persimmon Tree Seeds:

Date Plum Persimmon: 60-90 days cold moist stratification.

Japanese Persimmon: 60-90 days cold moist stratification.

Persimmon: 60-90 days cold moist stratification.

Pine Tree Seeds:

Jack Pine: None

Knobcone Pine: 60 days cold moist stratification.

Slash Pine: 21-30 days cold moist stratification.

Torrey Pine: 30 days cold moist stratification

Whitebark Pine: 30 days cold moist stratification

Bristlecone Pine: None Required

Canary Island Pine: None Required

Digger Pine: 60-90 days cold moist stratification.

Pond Pine: 21-30 days cold moist stratification.

Singleleaf Pinyon Pine: 21-30 days cold moist stratification.

Yunnan Pine: None Required

Coulter Pine: 30-60 days cold moist stratification.

Eastern White Pine: 30-45 days cold moist stratification.

Japanese Black Pine: None Required

Japanese Red Pine: 14-21 days cold moist stratification.

Jeffrey Pine: 21-30 days cold moist stratification.

Korean Pine: 30 days cold moist stratification.

Lacebark Pine: 7-14 days cold moist stratification.

Loblolly Pine: None Required

Ponderosa Pine: 30-45 days cold moist stratification.

Red Pine: None Required

Swiss Stone Pine: 21-60 days cold moist stratification.

Western White Pine: 60-120 days cold moist stratification.

Dwarf Swiss Mountain Pine: None Required

Sugar Pine: 60-90 days cold moist stratification

Longleaf Pine: None Required

Scotch Pine: None Required

Pinyon Pine: None Required

Austrian Pine: None Required

Chinese White Pine: 30 days cold moist stratification.

Aleppo Pine: None Required

Chinese Red Pine: None Required

Border Pine: 21-90 days cold moist stratification.

Sierra Nevada Lodgepole Pine: 30 days cold moist stratification.

Monterey Pine: 21 days cold moist stratification.

Weeping Mexican Pine: None Required

Foxtail Pine: 30-60 days cold moist stratification.

Redbud Tree Seeds:

Chinese Redbud: Seed requires a hot water treatment followed by 30 days cold moist stratification.

Eastern Redbud: Seed requires scarification then 30 days cold moist stratification.

Western Redbud: Seed requires scarification then 30-60 days cold moist stratification.

Redwood Tree Seeds:

Giant Sequoia: 21-30 days cold moist stratification.

Coast Redwood: 31-30 days cold moist stratification.

Dawn Redwood: None Required

Rubber Tree Seeds:

Hardy Rubber: 90 days cold moist stratification.

Silverbell Tree Seeds:

Carolina Silverbell: 60-120 days warm stratification followed by 60-90 days cold stratification.

Snowbell Tree Seeds:

American Snowbell: 60 days warm stratification followed by 90 days cold moist stratification.

Japanese Snowbell: 5 months warm stratification followed by 90 days cold moist stratification.

Fragrant Snowbell: 60 days warm stratification followed by 90 days cold moist stratification.

Sourwood Tree Seeds:

Refer to the High Humidity Germination section at the top of this page.

Spruce Tree Seeds:

Korean Spruce: None Required

Siberian Spruce: None Required

Colorado Blue Spruce: None Required

Jezo Spruce: 21 days cold moist stratification.

Oriental Spruce: None Required

Dragon Spruce: None Required

Meyer Spruce: None Required

Norway Spruce: None Required

White Spruce: 21-30 days cold moist stratification.

Wilson's Spruce: None Required

Black Spruce: None Required

Red Spruce: None Required

Sumac Tree Seeds:

Fragrant Sumac: Scarification required before planting.

Staghorn Sumac: Scarification required before planting.

Smooth Sumac: Scarification required before planting.

Sweet Gum Tree Seeds:

American Sweetgum: 60-90 days cold stratification.

Sycamore Tree Seeds:

American Sycamore: None Required

London Planetree: None Required

Tulip Tree Seeds:

Chinese Tulip: 60 days cold moist stratification.

Yellow Poplar: 60-90 days cold moist stratification.

Tupelo Tree Seeds:

Black Gum: 60-90 days cold moist stratification.

Chinese Tupelo: 60 days cold moist stratification.

Water Tupelo: 60 days cold moist stratification.

YellowWood Tree Seeds:

American Yellowwood: Scarification followed by 30 days cold moist stratification.

Wattle Tree Seeds:

Black Wattle: Scarification required before planting.

Green Wattle: Scarification required before planting.

Fruit Tree Seeds:

Osage Orange: 30 days cold moist stratification.

Banana Passion Fruit: Plant outside after the last frost in your area. Plant indoors in soil temperature of 70-75 degrees. Germination can take up to 35-40 days.

Banana: Plant in very warm soil with temperatures of 75-80 degrees F. Germination can take 3-7 weeks.

Chinese Date: Hot water treatment then cold stratification for 40 days.

Common Apple: 60 days cold moist stratification.

Common Guava: None Required

Manchurian Apricot: 30-60 days warm stratification followed by 90-120 days cold stratification.

Noni: Seed can take 6-12 months to germinate. 

Papaya: None Required. Seed can take 2-3 weeks to germinate.

Pomegranate: Soak seeds in water for 24-48 hours and then cold moist stratification for 30 days. Germination can take several months.

Sea Grape: None Required

Soursop: None Required. Seed germinates in 15-30 days.

Starfruit: None Required

Sugar Apple: None Required. Seed germinates in about 30 days.

Tamarind: None Required

Wild Purple Passionfruit: Seed requires scarification before planting. After scarification - soak seeds in warm water for 24-48 hours before planting.

Fuji Apple: 60 days cold moist stratification.

Nemaguard Peach: 60-90 days cold moist stratification.

Bartlett Pear: 60-90 days cold moist stratification.

Birchleaf Pear: 60-90 days cold stratification.

Bradford Pear: 60-90 days cold stratification.

Apricot: 30 days warm stratification followed by 90 days cold stratification.

Chickasaw Plum: 60-90 days cold stratification.

Beach Plum: 30-60 days warm stratification followed by 90-120 days cold moist stratification. Soak seeds in room temperature water for 48 hours before the warm stratification. Change the water after 24 hours.

American Red Plum: 90-120 days cold moist stratification.

Pineapple Guava: None Required

Common PawPaw: 60 days cold moist stratification.

Kiwi: 30 days cold moist stratification.

Banana Yucca: None Required

American Cranberry: 30-60 days cold moist stratification.

David's Peach: 60-120 days cold moist stratification.

Passion Fruit: Plant outside after all frost danger has passed. Plant indoors with an average temperature of 70-75 degrees. Germination can take 30-45 days.

Nut Tree Seeds:

Heartnut: 60-120 days cold moist stratification.

Pecan: 60-90 days cold moist stratification.

Almond: 60-90 days cold stratification. Almond tree seeds are slow to germinate.

American Beech: 90 days cold moist stratification.

Bitternut Hickory: 90 days cold moist stratification.

Black Walnut: 90-120 days cold moist stratification.

Cashew: None Required

Horse Chestnut: 60-90 days cold moist stratification.

Mockernut Hickory: 90-120 days cold moist stratification.

Shagbark Hickory: 90-120 days cold moist stratification.

Shellbark Hickory: 90-120 days cold moist stratification.

Butternut: 90-120 days cold moist stratification.

Unique Tree Seeds:

Common Yew: 90-210 days warm stratification followed by 60-120 days cold stratification.

Korean Evodia: None Required

Moringa: None Required

Yellowhorn: Scarification and hot water treatment required. Plant seed in the spring.

African Mango: None Required

Black Cottonwood: None Required

Blue Jacaranda: None Required

Cacao: None Required

California Pepper: None Required

Cashew: Plant in warm soil (75-80 degrees).

Chinese Date: Hot water treatment then cold stratification for 40 days.

Chinese Pistache: 28-56 days cold moist stratification.

Curl-Leaf Mahogany: None Required

Flamboyant: Soak seed in warm water for 24 hours and then plant in warm moist soil.

Gum Arabic: Scarification required before planting.

Neem: None Required

Purple Orchid: None Required

Sacred Fig: Same as Royal Empress and Quaking Aspen.

Sandbox: None Required

Sassafras: 120 days cold moist stratification.

Soap: Scarification Required

Tamarind: None Required

Tomato Tree: None Required

White Orchid: None Required

Wild Purple Passionfruit: Scarification Required

Dove: Seed has a long pre-treatment. 4-5 months warm stratification then 90 days cold stratification. 

Golden Chain: Scarification required. Soak seeds in room temperature water for 24-48 hours. 

Shrub Seeds:

American Bittersweet: 60-120 days cold moist stratification.

Common Buckthorn: 60 days cold moist stratification.

Common Seabuckthorn: 90 days cold moist stratification.

Glossy Buckthorn: 60 days cold moist stratification.

Wax Currant: None Required

American Beautyberry: 90 days cold moist stratification.

American Cranberry Bush: Seed requires 180-510 days warm stratification followed by 60-120 days cold stratification. The best way to achieve this is to plant outdoors in spring/early summer. The seeds will germinate the following spring.

Bear's Breeches: None Required

Bird of Paradise: Scarify seeds before planting or soak in warm water for a few hours before planting.

Black Chokeberry: 90-120 days cold moist stratification.

Carolina Buckthorn: 60 days cold moist stratification.

Chinese Boxwood: 30 days cold moist stratification.

Chinese Sweetshrub: Hot water treatment then 30 days cold moist stratification.

Common Boxwood: None Required

Curl-leaf Mahogany: None Required

Dwarf Russian Almond: 30-60 days warm stratification followed by 90-120 days cold stratification.

Five Flavor Berry: 30-60 days cold moist stratification.

Fragrant Sumac: Scarification required before planting.

Green Wattle: Scarification required before planting.

Indigo Bush: Hot water treat or scarify for 8 minutes then cold moist stratification for 30-60 days.

Japanese Mock Orange: None Required

Korean Boxwood: 30-60 days cold moist stratification.

Lace Leaf Japanese Maple: Seed requires hot water treatment followed by 90-120 days cold moist stratification.

Mexican Manzanita: Seed requires scarification by fire or smoke treatment to germinate. Scarify in boiling water for 10-20 seconds then cold moist stratification for 60 days. After 60 days of cold moist stratification - burn straw over the seed then plant.

Nanking Cherry: 90 days cold moist stratification.

Narrow-Leaf Purple Coneflower: None Required

Scarlet Firethorn: 90 days cold moist stratification.

Shadblow Serviceberry: 30-60 days warm stratification followed by 90-120 days cold stratification.

Utah Serviceberry: 90-120 days cold moist stratification.

Virginia Creeper: 60 days cold stratification.

Wild Senna: Scarify seed before planting.

Azalea Knaphill Hybrid: See the 'High Humidity Germination' process at the top of this page.

Beauty Bush: 90-120 days cold moist stratification.

Chaste: None Required

Climbing Hydrangea: See the 'High Humidity Germination' process at the top of this page.

Creeping Mahonia: 60-90 days cold moist stratification.

Cumberland Azalea: Same as Climbing Hydrangea

Eastern Ninebark: 21-30 days cold moist stratification.

Flame Azalea: See the 'High Humidity Germination' process at the top of this page.

Fragrant Wintersweet: 90 days warm stratification followed by 90 days cold stratification.

Hydrangea Bretschneideri: Same as Flame Azalea

Japanese Cedar: 30 days cold moist stratification.

Japanese Flowering Quince: 60-90 days cold moist stratification.

Korean Azalea: Same as Flame Azalea

Laurustinus Viburnum: 180-510 days warm stratification followed by 60-120 days cold stratification.

Nannyberry Viburnum: 150-270 days warm stratification followed by 60-120 days cold stratification.

Oregon Grape Holly: 90 days cold moist stratification.

Peking Cotoneaster: 10-90 minutes scarification followed by 60-90 days cold moist stratification.

Red Rugosa Rose: None Required

Tea Berry Viburnum: 60-90 days warm stratification followed by 90 days cold moist stratification. 

Texas Mountain Laurel: Scarification required before planting.

Vernal Witchhazel: 60 days warm stratification followed by 90 days cold moist stratification.

Rose of Sharon: Scarify seed before planting. You may mechanically clip or file small lots. Some growers soak seed in water until they sink and then plant the seed.

European Smoketree: 60 days warm stratification followed by 90-120 days cold stratification. Some growers will scarify the seed to replace the warm stratification.

Oakleaf Hydrangea: See the 'High Humidity Germination Process' at the top of this page.

Border Privet: Soak seed in water for 48 hours then cold stratification for 60-90 days.

Common Privet: 30-60 days cold moist stratification.

Chinese Wisteria: None Required

Japanese Wisteria: Soak seed in water for 12-24 hours then plant.

Blue Passionflower: None Required

Passion Fruit: Plant outside after all frost danger has passed. Plant indoors with an average temperature of 70-75 degrees. Germination takes place in 30-45 days.

Cape Jasmine: None Required

Desert Willow: None Required