I found a box of Dahlia tubers that didn't get planted this spring. They are all sprouting. What can be done with them? Save for next year or throw away? Marti
Certified GKH Gardening Expert
I fear that it would be a bad idea to bring them back into dormancy from here. You may want to plant them in container, and grow them indoors until spring.
Here is an article that will explain how to properly winter these: https://www.gardeningknowhow.com/ornamental/bulbs/dahlia/storing-dahlia-tubers.htm