First of all, make sure you’re planting it in a sunny, warm location. Bougainvillea needs sun & heat to thrive & be a blooming machine.
This plant also loves the heat. Not enough sun = not enough color.
Just like planting a shrub, dig the hole at least 2 times as wide as the rootball. Loosen the soil on the bottom of the hole to make sure the water will drain out.
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Bougainvillea doesn’t like to be kept sopping wet & is subject to root rot.
The soil needs to be well drained. A rich, loamy soil is ideal. I always amend in the ratio of 1/3 local organic compost to 2/3 native soil when planting bougainvillea.
I always keep a 2-3in layer of compost on top for good measure.
Use link below for full guide on Planting Bougainvillea