Posted: 06/04/2014 at 13:51
I had to give up growing them because of rust, Kirsty. They used to grow fine many years ago but it seems the air pollution back then (sulphurous smoke from burning coal) actually helped protect against it. I have tried spraying with fungicide from seeding emergence to adulthood, different soil types and planting aspects, and pots. Nothing prevented rust finally killing the plants, but some of them did get to produce nice flowers, although the ugly rusted leaves and stems always took away a lot of the pleasure. The good news is there are lots of other plants so I don't miss them too much!