Diascia, sometimes called twinspur, is a delicate, frothy type of plant. Some varieties will spill over pots, and others tend to grow more upright. It's a relative of the snapdragon and comprises about 70 different species in South Africa, where it is a native. The varieties of diascia you see popping up at garden centers have been bred rather recently. They’re coming out with new colors and better bloomers every year.