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.
When to Sow Indoors:
Start indoors 6–8 weeks (42–56 days) before your last expected frost.
When to Sow Outdoors:
Not recommended. Direct sowing is unreliable due to small seed size and moisture sensitivity.
Optimum Germination Temperature: Use a heat mat to maintain steady temperatures of 18–22 °C (65–72 °F)
Germination Time: Up to 28 days
Light Requirements for Germination: Light is required. Surface-sow and press seeds gently into the soil.
Use grow lights to maintain 12–16 hours of light per day.
How to Sow Indoors:
Use a fine, well-draining seed-starting mix. Scatter seeds on the surface and lightly press them in—do not cover with soil. Bottom-water or mist gently to avoid displacing seeds.
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.
Post-Germination Care:
Once seedlings emerge, provide bright light and good air circulation. Keep soil lightly moist but never waterlogged. Transplant carefully once seedlings have several true leaves.
Final spacing: 25–30 cm (10–12 in)
Plant type: Tender perennial (often grown as an annual)
Mature height: 30–60 cm (12–24 in)
Growing Tips:
Pinch young plants to encourage bushier growth and more flowers. Prefers rich, well-draining soil and regular watering. Protect from frost and strong winds. Excellent for containers, borders, and cool-season color.
More guides at: bloomoutlet.com/seed-guides