Grow royal poinciana from seed by nicking the hard coat or soaking it, then sowing it about half an inch deep in a warm mix that drains.
Nick the hard seed, soak it, then sow it half an inch deep
| Factor | Recommended | Avoid |
|---|---|---|
| Coat | Nick the rounded end, or soak in hot water that has come off the boil | Do not sow an untreated hard seed and wait months |
| Depth | Cover about half an inch, or up to an inch | Do not bury the seed two inches down |
| Warmth | A warm, bright spot; keep the mix moist | Do not let the tray dry, or sit in a soggy saucer |
| Start | Seed is the usual start | Do not count on a stem cutting as the usual method |
The seed coat of royal poinciana is hard, so water cannot get in until you nick it or soak it. [1] File or clip a tiny window on the rounded end, or pour hot water that has come off the boil over the seed, let it cool, and soak overnight until the seed swells. A short dip in very hot water, then a day in room-temperature water, also works. [2] Sow about half an inch to an inch deep in a fast-draining mix, keep it warm and evenly moist, and wait two to six weeks for the sprout. [3] Seed is the usual way to start this tree. [4]
- Crack a dark brown pod, or buy seed, and take several seeds so one or more will sprout.
- Nick the rounded end with a file, or pour hot water that has come off the boil over the seed and soak it overnight until it swells.
- Sow about half an inch deep, or up to an inch, in a clean tray or pot of mix that drains.
- Keep the mix moist and warm, in bright light out of hot afternoon sun.
- Pot the seedling on when it has two sets of true leaves, then grow it until you are ready to plant it out.
How do I germinate royal poinciana seeds?
Nick the rounded end or soak the seed in hot water that has come off the boil, then sow it about half an inch deep and keep the mix warm and moist.
Do I need to nick the seed?
Yes, unless you use a hot-water soak that softens the coat. An untreated seed can sit for months.
Seed is the usual start; cuttings are slow
Stem cuttings can root in warm, humid mix, but they are slower and less reliable than seed. Sow the nicked seed unless you are copying a yellow form that does not come true.
Can I grow it from a cutting?
You can try a cutting in warm, humid mix, but seed is the usual start.
Nick or soak the hard seed, sow it about half an inch deep, keep the mix warm and moist, and use seed as the usual start.
FAQ
How long until a seed sprouts?
Often about two weeks after a good soak, and sometimes five or six weeks. If nothing shows after a month, the coat may still be sealed, or the seed was not viable.
Can I grow the yellow kind from seed?
A yellow tree is usually copied by a cutting or a graft. Seed from a red tree will make another red tree. Sow the nicked seed of the tree you have.
Related guides
Recommended plants
References
- [1] Hunker -
https://www.hunker.com/13429167/how-to-germinate-royal-poinciana-seeds/ - [2] Garden Guides -
https://www.gardenguides.com/111092-germinate-royal-poinciana-seeds.html - [3] Weekand -
https://www.weekand.com/home-garden/article/germinate-royal-poinciana-seeds-18050536.php - [4] UF/IFAS EDIS -
https://ask.ifas.ufl.edu/publication/ST228
This note is part of Delonix Guides.
More notes on making another plant live in Propagating Guides.
Updated: Reviewed by Bosquelle Editors