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
Soak seeds in lukewarm water for 4–6 hours before planting.
When to Sow
- Indoors: Start 56–70 days (8–10 weeks) before your last expected frost.
Sowing Indoors
- Sow seeds on the surface of a moist, well-draining seed starting mix.
- Press gently to ensure contact but do not cover—light aids germination.
- Light: Seeds require 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 briefly once per day for fresh air and to reduce mold risk. Remove the dome once seedlings emerge.
Germination Requirements
- Optimum Temperature: Use a heat mat to maintain steady temperatures of 20–22 °C (68–72 °F)
- Germination Time: up to 28 days
Post Germination Care
- Transplanting: Move seedlings to individual pots once they have 2–3 sets of true leaves.
- Spacing in Garden: 20–30 cm (8–12 in) apart.
- Type: Perennial (often grown as biennial or annual in cold climates).
- Mature Height: 45–60 cm (18–24 in).
- Site: Prefers full sun and well-drained, neutral to slightly alkaline soil (pH 6.5–7.5).
Growing Tips
- Avoid overly rich soil, which encourages foliage over flowers.
- Pinch back young plants to encourage bushier growth.
- Deadhead spent blooms to extend flowering season.
- Provide moderate, even watering—avoid soggy soil.
- Mulch lightly to conserve soil moisture and reduce weeds.
More guides at: bloomoutlet.com/seed-guides