Powdery mildew and pots
1) Some of my dahlias already have powdery mildew - we are having a long, cool, moist spring. I made up a baking soda solution and sprayed. Well, I overdid the application, and quite a few leaves have shriveled in protest. But on the bright side, the new growth coming in looks to be free of powdery mildew. In order to keep them that way, how often do I need to repeat the application? (more sparingly of course).
2) Gophers ate two of my dahlias planted in the ground. So I dug the rest up, and put them back into large pots. Interestingly, the root balls were smaller after 3 weeks in the ground than they were when I took them out of the pots - I suspect due to the aforementioned long, cool, moist spring, the ground was a bit too cold to be welcoming. But soon, the soil in the pots will get too hot, and I know they don't like that. I wonder, has anyone here experimented with partially burying the pots in the ground? How did that work for you? Any other solutions to the gopher issue?