Some careful light pruning during maturation can help make a better formed tree. Take most of the branches that grow beneath the main crown. These lower branches will just add more shade and are not needed. If your tree is a little thin for branches, skip this pruning. Royal Poinciana is tolerant of some salt drift, not too fussy as to soil and has no pests.
Light fertilization is recommended.
Plant as a foundation tree or, if you have the land, use three about 20 feet apart in a triangle. The effect will be a huge protected shaded area suitable for almost all plants and people. There is also a yellow Poinciana that blooms in spring as well as a very colorful shrub to 10 feet called Paradise Poinciana . You may be interested in receiving great tropical plants mail order from Master Gardener. We ship from spring thru fall depending on the weather up north.