Can you divide dahlias in spring? If you've got a clump of tubers that’s looking more crowded than a bank holiday beach, ...

It’s dahlia season, when these big ... your tubers and start them off in a pot in compost under cover, in a cool greenhouse or under a porch, in spring, covering the crown.

Dahlias thrive in a sunny spot in fertile, well-drained soil. They're tender plants so can't be planted out until the danger of frost has passed in late spring, but on light soil their tubers can be ...