Posted: 08/09/2016 at 18:59
Bluerose,I think they are simply too dry. yes,, they may be vigorous spreaders but in decent conditions. A thick mulch in future will help.
i would be surprised if they have flowered already and gone over....I would expect them to flower through September
there are a couple of additional problems but anything that is struggling attracts pests and diseases. Address cultivation...mulching, Feeding and watering...and all should be well next year