By Cammomile
west sussex,
United Kingdom 
Is it possible to overwinter osteospermums in an unheated greenhouse? To my knowledge they are not the hardy type and arrived too late in the season to produce many flowers.
1 Sep, 2011
i believe that they can overwinter under glass, but it may depend on how cold the winter gets? it appears other members have overwintered in this way, best luck, will be trying to do the same with some non-stop begonias, [fantastic flowers and colour]
2 Sep, 2011