Tibouchina longisepala Melostomataceae Deborah Lindsay, Kaiser Center Roof Garden, Oakland Most of this family is tropical but a few species like this one and its larger cousin, the Princess Flower, can take a certain amount of light frost. This species is a small shrub to 3 feet with pink 1-inch flowers from mid-summer into winter. It prefers part shade and loves the fog belt. It is native to Central America and is fairly new to cultivation. Photo by Jill Salmon