|The Princess Series cultivars bear semi-double or double flowers with feathery petals in a large color palette. This fast grower originally found its home on rocky slopes and poor soils in China. Slightly resembling a chrysanthemum, the flowers may be either single or double in shades of purple, blue, rose, white, and sometimes yellow. Taller cultivars will require staking. This plant will thrive in neutral to alkaline soil that is well drained and sunny. For a longer season of bloom, deadhead. Easlily started from seed when soil temperatures are above 60 degrees.