Blue Plumbago, Cape Leadwort. Unusual blue color for tropics! Blooms all year round with denser blooms from March to November. Plumbago is popular in both tropical and sub-tropical gardens because of its delicate blue flowers, it is seen often as a low plant used for hedges. It tolerates both drought and poor soil, grows best if it is heavily pruned from time to time, even cut back to the ground.