I have just potted some very late sprouting dahlias in the hope of at least getting viable tubers for next year. Does the plant have to flower to produce eyes on the tuber?
The mother tuber grows larger and uses the same eyes next year to grow again. It is certainly is not too late for some other tubers to form and be large enough to divide. Here in Oregon, during a really wet season, one grower was not able to plant until July 1st. She had enough tubers from most varieties to have a good season the next year and the great majority of her plants bloomed before frost. .
Thanks, fingers crossed.