petunias from seed OUTDOORS???
...can anyone tell me what the minimum temp has to be for me to start the 'wave' petunias from seed outdoors?? I live in zone 6 and they do self-sow every year on my deck(though my local nursery tells me that's impossible). I have started some inside....but would like to 'sprinkle' some seed around my gardens...just have no idea how soon I could do that. Maybe someone in zone 7 (one up from me) may know???
Thanks so much,