The acidanthra may flower next year tehy dont always flower the first year after being replanted.
as for the osteopernum they do generally need to be kept frost free . There are a few hardy ones but most of the ones used for summer plantings will die in the frost.

You can ask as many questions as you like too. :o)

Personally I'd put the osteospermum out doors but keep an eye open for heavy frosts and put them in a green house or cold frame if it will be very cold.

It depends on whether they really 'are' the hardy ones - Osteospermum jucundum is the only one that is. Where you are, too, I wouldn't risk planting plugplants outdoors.

Acidanthera aren't all that reliable. I grow mine in pots, and give them winter protection. When they start to shoot, I water them freely - that was a Nurseryman's tip, and it works! I get flowers, which I didn't before.

Last year osteospemum in pots in the gh flowered right through until spring, the year before with the same care I lost them to the prolonged cold

thank all the people who have been most helpful