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I want to start my sunflowers early before I plant them outside. When should I plant the seed(s)?

I live in southern Ontario, just north of Toronto, and I want to plant my sunflowers early but I don't know how early to start. I will eventually transplant them outside in the main garden, but if I plant the seeds inside in a pot too early, I think that stunts the growth or something. Can anyone give me any insight?

Public Comments

1. late march or early april.
2. YOU SHOULD START NOW IT THE TIME BUT BUY IN HOME DEPOT SOME LITTLE QUARTERS THEY A RE MADE OF DIRT AND YOU SOAK THEM IN WATER AND IT GROWS AND THEN PUT THE SEEDS INSIDE AND KEEP THEM SOAK IN A PLASTIC SO THEY WONT DRIED AND WHEN THEY ARE READY TAKE THEM OUT BUT START NOW OR BUT DIRT AND PUT SOME INT HE EGGS CARTIGEAS AND PLATNT INSIDE
3. I don't think you should start them early. Given plenty of sun, sunflowers grow very rapidly anyway. Also, they do not transplant well. Happy Growing!!
4. I would plant the seeds outside after the danger of frost is over. I never start sunflowers indoors because once they bloom they are done and then they are just plain old ugly after that.