I'm having some trouble with some salvias and agastaches I have planted. They were from pint size containers and were so beautiful for a while after I planted them. They had flowers and everything was great for three or four weeks until all the leaves started to die or get diseased and I ended up cutting more and more until most of them ended up being cut almost all the way to the ground. Should I start over or just keep watering? Will these come back and be ok? Eventhough it's fall there have been a few hot days and I think that it was too much for them - I'm thinking they didn't get enough water, I don't know! What should I do?