Well, the good news is there's no harm in trying.

They won't be as successful in hotter temperatures (I don't think there's a magic number), but if you're really wanting to get some success, you can try shading the pollinated blooms. If anything is potted, move it to a cool location (indoor perhaps).

Nate

I've heard that 70 to 75 F is ideal but, I try no matter what the temp except 90's F.

Julia

Marg, you have nothing to lose except a little time. Do it and see what happens...Ellie

Well, yesterday after I posted I thought I might as well try. I waited til later in the day when it was a bit cooler and made two crosses, now we'll see what happens. It's always nice to hear what others think tho. Thanks. Marg