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
Cold Stratification:
- Place seeds in a moist paper towel, or mix with moist sand or vermiculite.
- Seal in a plastic bag and refrigerate for 3–4 weeks at 35–40°F (1–4°C).
- Keep moist (not wet) and check for mold.
- If seedlings sprout in the fridge, plant them immediately
When to Sow
- Indoors: Start seeds 8–10 weeks before last frost.
- Outdoors: Direct sow in fall or early spring for natural stratification.
How to Sow
- Surface sow seeds and press gently — do not cover, they need light to germinate.
- Use grow lights to maintain 12–16 hours of light per day.
- 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.
Watering
- Keep soil evenly moist during germination.
- Avoid waterlogging — use a fine mist or spray bottle to water gently.
Germination Time
- Typically 30–90 days (after stratification); can take longer depending on conditions.
- Optimum temp: 65–70°F (18–21°C).
Spacing
- Thin or transplant seedlings 10–12 inches (25–30 cm) apart once large enough to handle.
Growing Tips
- Prefers well-draining, fertile soil.
- Tolerates a range of soils; thrives in light, loamy soil.
- Ideal pH: 6.0–7.0 (slightly acidic to neutral).
- Partial shade to full sun.
- In hot climates, partial shade helps prevent leaf scorch.
- Produces graceful red & yellow flowers that attract hummingbirds, bees & butterflies.
- A short-lived perennial but self-seeds readily for naturalizing.
Deadhead spent blooms to encourage more flowers.
More guides at: bloomoutlet.com/seed-guides