“To grow strong roots and healthy stems, dahlias need to be planted at the right depth and in the correct position,” says Vasylchyshyna. Simply place each tuber horizontally in a hole about 5 to 6 ...

Aim to feed your dahlias once a fortnight if you’re growing them in pots. For dahlias grown in flower beds or raised beds, you can feed less often; once every three to four weeks will be sufficient.