Dahlias certainly are beautiful. You definitely want to wait until it has finished blooming, but it is best to wait until the first frost has hit or the leaves have turned brown. At that point, you could transplant your tuber to a new container with fresh potting mix and store indoors in a cool, dark room for the winter. But it would probably make more sense to simply remove the tuber from the current container and store it as outlined above for the winter before then putting the tuber in a new container in the spring. That way you don’t have to lug the new, larger container (which will be heavier) in this fall and out again next spring.
Hi Dollie,
Dahlias certainly are beautiful. You definitely want to wait until it has finished blooming, but it is best to wait until the first frost has hit or the leaves have turned brown. At that point, you could transplant your tuber to a new container with fresh potting mix and store indoors in a cool, dark room for the winter. But it would probably make more sense to simply remove the tuber from the current container and store it as outlined above for the winter before then putting the tuber in a new container in the spring. That way you don’t have to lug the new, larger container (which will be heavier) in this fall and out again next spring.
Good luck!