They do love the heat but they require light to germinate and with the fluffy heads on the seeds they blow away very easily. I would suggest starting them in doors 4 to 6 weeks before last frost and then not putting them out until the soil temp outside reaches a steady 55 degrees f.
The ones I have are a miniature variety only about 6 inches tall but lots of blooms. Would you like a packet of seeds to try next spring?