Tubers can be divided right after digging them up like this or in the spring. Because they're so big when they come out of the ground they're hard to store. Splitting them in the fall (and not the spring) eliminates that problem because they take up much less space once they've been divided.

Can I split my dahlia tubers?

You can divide your dahlia tubers in either the winter or springtime. You may want to wait until spring when the tuber eyes are more visible. To get started you will want a clean workspace, a good pair of garden scissors, cinnamon, and bleach.

Can you split dahlia tubers UK?

Dahlias are a perennial plant that grow from tuberous roots. And like most tuberous flowers, it is easily propagated by digging up and dividing the roots. ... In warmer climates where the tubers can remain in the ground, you can dig up, divide, and replant the tubers in early spring before growth has begun.