Tall dahlias in pots for slug protection?
This is my first year planting dahlias and wondered if for slug protection, I could plant tubers for 5 foot tall dahlias, in large plastic pots partially sunk in the flower bed with copper tape around the top edge of the pot. This works well for 6' tall sunflowers. I don't know how tubers work in the ground. Do they send out roots or fungal connections that require lots of space around the tuber? If they do then I expect a pot may be too restrictive. I will be feeding the dahlias regularly, so would pots be OK?