Thespesia populnea is a fast-growing tropical tree native to coastal regions of Asia and the Pacific Islands. It is known for its beautiful yellow flowers and valuable timber. The species has hard seeds that typically require scarification to improve germination rates.
Before sowing
Scarification
mecanica Scarification with knife or sandpaper, or concentrated sulfuric acid for 20-60 minutes
Soak
24 h Soak seeds in water for 24 hours before planting to enhance germination
Hard seed coat requires scarification for improved germination
Sowing
Substrate
well-draining potting soil or sterile seed compost
Depth
1cm
Temperature
25°C
Moisture
media
Container
pots deep enough to accommodate taproot
What to expect
Step 1
Pre-treat the seed
Step 2
Sow at 1cm · 25°C
Day 8–70
Seedlings emerge
Tips
Direct sowing often fails; use scarification and soaking pretreatment. Germination can be variable (8-70 days). Keep soil moist during germination phase. Seedlings ready for planting out in 12-16 weeks. Does not tolerate shade.
Sources: PFAF Database, Sheffield Seeds, Plants for a Future (PROTA), Hawaiian propagation protocols, SciELO Brazil botanical study
