How to plant waterlily dahlias
Waterlily dahlias are available either as rooted cuttings or as tubers. While tubers will usually make larger plants, they are also more expensive.
Pot up rooted cuttings into 3½in (9cm) pots. Move them into larger pots before hardening off and planting out after the last frost.
Pot up tubers into 4.5-6in (12-15cm) pots, depending on the size of the tubers. Last year I had to pot on some of mine as they grew so well.
Keep your plants frost-free but cool to avoid straggly growth.
Tubers can also be planted directly into the garden in early May. Soil should be mounded over them to protect the first shoots from damaging frosts.