For optimal germination rates, initiate seed propagation indoors under controlled conditions—unless the species exhibits a high sensitivity to root disturbance. This approach allows precise regulation of temperature, humidity, and light, improving germination consistency and seedling viability. Do not skip any recommended seed treatments, as they are essential for uniform and successful germination.
⚠️ Keep soil evenly moist during germination. DO NOT LET IT DRY OUT—once seeds begin absorbing water (imbibition), drying can kill the seed embryo, and even brief dryness after sprouting can kill seedlings.
Seed Treatment (Required)
Step 1: Cold Stratification
Cold stratify seeds for 60–90 days (60–90 days) in a moist medium (such as damp sand or peat) at 1–4 °C (34–39 °F). Expect slower and less uniform germination.
Check regularly: If seedlings sprout in the fridge, remove them gently and plant immediately.
When to Sow
Indoors:
Sow after cold stratification, ideally in late winter to early spring.
Outdoors (Natural Stratification – Optional):
Sow in autumn. Surface-sow seeds outdoors in containers or a protected seedbed and allow natural winter chilling. Germination occurs in spring as temperatures rise.
Germination Conditions
Germination Temperature: Use a heat mat to maintain steady temperatures of 20–25 °C (68–77 °F)
Germination Time: Up to 90 days after stratification
How to Sow Indoors
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Fill seed trays or pots with a fine, well-draining seed-starting mix.
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Surface-sow seeds and gently press them into the soil—do not cover.
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Water gently to settle seeds.
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Humidity: Use a humidity dome or clear cover to maintain consistent moisture during germination. Open the dome BRIEFLY once per day to allow fresh air in and reduce mold risk. Remove the dome entirely once seedlings emerge.
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Use grow lights to maintain 12–16 hours of light per day
Post-Germination Care
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Transplant seedlings once they have several true leaves
• Final Plant Spacing: 90–150 cm (36–60 in)
• Plant Type: Deciduous shrub
• Mature Height: 120–240 cm (4–8 ft)
• Acclimate seedlings gradually before planting outdoors
• Full sun to partial shade for best flowering and berry production
Growing Tips
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Berries are most vibrant in full sun
• Prune in late winter to encourage fresh growth and heavier fruiting
• Tolerant of heat and humidity once established
• A favorite of birds and pollinators—excellent for wildlife gardens
More guides at: bloomoutlet.com/seed-guides