Description
Caltha palustris plena is a double-flowered form of the native marsh marigold. In early spring it produces fully double, bright yellow, long-lasting flowers above rounded, glossy dark green leaves.
Double marsh marigold at a glance
| Botanical name |
Caltha palustris plena |
| Common name |
Double marsh marigold, double kingcup |
| Plant type |
Clump-forming perennial; dies back in winter |
| Height and spread |
About 20–40 cm tall, 30–50 cm wide |
| Flowers |
Bright yellow, fully double, March and April |
| Position |
Full sun |
| Soil |
Rich, wet, boggy soil or very shallow water |
| Pond depth |
0–5 cm of water over the crown |
| Hardiness |
RHS H7 – very hardy (below -20°C) |
| Native to |
Garden form of the UK native marsh marigold |
Where to plant double marsh marigold
- The shallow edge of a garden pond, 0–5 cm deep
- Wet, boggy ground beside a pond or stream
- Small ponds, where its compact size suits
How to plant and care for it
Plant in spring or summer in rich, wet soil in full sun. Cutting back the old foliage after flowering usually brings a lighter second flush of flowers in autumn.
Is it good for wildlife?
The single marsh marigold is an early nectar plant. Double flowers generally offer insects less nectar and pollen, so choose the single form if wildlife is your main aim.
Is marsh marigold poisonous?
Yes. The leaves are poisonous if eaten and the sap can irritate skin, so wear gloves when handling it.
Which size should I buy?
Bare-root plants (7 cm, 9 cm, 1 litre and 3 litre) arrive without a pot or compost and are the most economical way to plant a group. Potted plants (9 cm, 1 litre and 3 litre) arrive growing in our peat-free compost and give a faster display. Packs of 3 come in 7 cm, 9 cm, 1 litre and 3 litre bare-root sizes and cost less per plant. The 2x Pot & Compost option is two plants supplied with pots and compost.
