By: Katharine

In reply to Richard.

In theory, if you give the dahlias enough water and feed they should be fine but I genuinely find they do better outdoors. It may be because a greenhouse in summer is humid as well as hot and I just think dahlias prefer a drier heat. Honestly though, I’ve never tried to grow them in the greenhouse all summer so you could maybe take cuttings and try some indoors and some out as an experiment. The other thing to bear in mind is the type of dahlia you choose – some dahlias grow pretty large and will struggle in a pot whereas one advertised for patios will probably fair better.