Someone at my flower arranging class was using these & I thought I'd like to
try & grow some - can they be sewn directly outdoors or do they need to be
germinated indoors? I don't have a greenhouse (yet) so my utility room
doubles up for now. Currently we have a windowsill full of sunflower
seedlings which the children are growing.

Do they need particular conditions & when should I grow them?

Thanks for any help!
Jayne