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 warm water for 24 hours before sowing.
When to Sow
Indoors: Start 30–60 days (4–8 weeks) before your last frost date.
Outdoors: Sow directly in late spring to early summer once soil is warm and frost danger has passed.
Germination Conditions
Optimum Temperature: Use a heat mat to maintain steady temperatures of 24–30 °C (75–86 °F)
Germination Time: up to 30 days
Light: Seeds germinate best with light exposure. Surface sow—press gently into soil; do not bury. A very light dusting of vermiculite may be added if needed to maintain humidity. Use grow lights to maintain 12–16 hours of light per day.
How to Sow Indoors
- Fill pots or seed trays with well-draining seed starting mix.
- Surface sow seeds and press gently into the soil (do not bury).
- Mist lightly to settle 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
- Transplant seedlings once they develop 2–3 true leaves.
- Space plants 90–150 cm (3–5 ft) apart.
- Mature Size: Shrub or small tree, typically 2–6 m (6–20 ft) tall.
- Prefers full sun and well-draining soil.
- Drought tolerant once established, but young plants need regular watering.
- Pinch back tips when young to encourage bushier growth.
Growing Tips
- Protect young seedlings from cold; Tecoma stans is frost sensitive.
- Ideal for pollinator gardens—flowers attract bees, butterflies, and hummingbirds.
- Can be pruned to maintain shape or size.
More guides at: bloomoutlet.com/seed-guides