Dahlia’s weather stressed or diseased?

Hello, I am growing Dahlia’s for the first time in midtown Toronto, they were doing quite well until heat spell and a recent deluge of rain. Now one plant has some yellowing along the leaf veins, looks mottled (possible DMV?…

Speeding up Dahlias and Calla lilies

I’ve bought dry tubers of each of these at a Metro grocery store. They’re packed in sealed, clear plastic bags, the calla lily tubers in what looks like sawdust, and the dahlia tubers bare. Is there anything I can do…