Posted: 31/07/2012 at 15:57
Are you keeping the same plants to flower again?
The reason I ask is if you treat as bi-enniel and discard after flowering then raise fresh ones for flowering the following year -that might work
My impression is that rust resistant varieties partially resist it -but the conditions this year have been ideal for rust and the spores do remain in the soil
Alina usually has some good advice on this-hopefully she will pick it up