Posted: 27/08/2015 at 08:48
GWRS my FB friend Philip Orley has three explanations for the state of your dahlias. He says either this one in the picture has flowered and that is the seedpod forming, or the flower has rotted with the rain followed by humid weather or it has had a high nitrogen feed when it did not need it. Tomato food is low in nitrogen should any flowers need feeding. I favour the weather explanation myself but you did say you are away a lot from your garden so perhaps you did miss this one flowering.