Use semi-hardwood cuttings, not soft green tips, and give them bottom heat with high humidity. Without those two conditions the success rate falls off sharply.
Choosing the right wood
This is where most attempts fail before they start. Soft new green growth wilts and rots. Fully hardened old wood is too dormant to respond. What you want is semi-hardwood, meaning growth from the current season that has begun to firm up and turn woody at the base while remaining flexible.
The practical test is to bend the stem. If it snaps cleanly it is too hard. If it flops without resistance it is too soft. If it bends and springs back, it is right. Late summer is when most plants have wood at this stage.
Taking and preparing the cutting
- Cut a length of about fifteen centimetres with three or four nodes.
- Remove all leaves from the lower two thirds and reduce any remaining large leaves by half to cut water loss.
- Trim the base to just below a node with a clean angled cut.
- Dip the base in rooting hormone. Unlike geraniums, bougainvillea genuinely benefits from it.
- Insert into a free-draining medium, half perlite and half coarse sand or a cactus mix.
The conditions that decide the outcome
| Condition | Target | Why it matters |
|---|---|---|
| Bottom heat | 21 to 27 degrees Celsius | The single largest factor in success rate |
| Humidity | High, but ventilated daily | Prevents wilting without inviting fungal rot |
| Light | Bright, indirect | Direct sun cooks a rootless cutting |
| Moisture | Just damp | Wet medium rots the base before roots form |
A heat mat makes the difference between an occasional success and a reliable one. If you do not have one, the top of a fridge is a reasonable substitute in cooler months.
Timeline and what to expect
Expect six to ten weeks. Do not tug the cutting to test it, because that breaks the fragile new roots. Instead watch for new leaf growth, which only happens once roots can support it. Some cuttings hold their leaves for weeks and still fail, so leaf retention alone is not evidence of rooting.
Once new growth appears, ventilate more each day for a week before removing the cover entirely, then pot on into a gritty mix. Bougainvillea flowers on new growth and prefers being slightly pot bound, so resist the urge to move it into a large container.