Hola Philip
Is your Bougainvillea in a pot and requires moving?
All bougainvilleas thrive in full sun in a free-draining, soil based compost. They require a night temperature of 10ºC (50ºF). For pot culture use John Innes No 3 compost. Water freely during the summer months, but very spariingly during the winter - if you have the plant in a pot, look underneath and see if the roots are coming through the holes in the bottom - if so this is a good indication of a plant being pot bound.
Use a high nitrogen liquid feed in spring and change to a high potash one when flowering begins. Bougainvilleas are not self clinging and must be tied to their supports.
Pruning
Cut back the previous season's lateral growth in spring; only spurs up to 3cm (1 1/4 in) long should remain.
Hope that helps and if need be send us a picture
Campo Girl
General Gardening Spain