Fully double flowers in red, pink, orange, yellow and white measure 4-6 in. across, grow 30 in. tall. Those flowers get very bushy and have several blooms. Blooms in early summer, no matter how hot it gets. Great cutflower.
The good seeding season is the mid to end spring. It is recommended to plant them directly in container, because their germination rate is pretty high, and the size of the seeds is large enough to be treated easily.
It is recommended to keep 3 inches of interval to seed them, because they grow big. Full sun is preferredThey seems to be always thirsty. Especially in the dry summer in California, sometimes they require watering more than once a day. However, in the humid summer in Japan, maybe it is enough if you water them once a day only on sunny days.
If you forget watering, they lose vigor easily.