Description
Caltha palustris, known as marsh marigold or kingcup, is a UK native marginal plant with rounded, rich dark green leaves and waxy, golden-yellow flowers about 4 cm across. It is one of the first pond plants to flower each year, usually from March to May.
Marsh marigold at a glance
| Botanical name |
Caltha palustris |
| Common name |
Marsh marigold, kingcup |
| Plant type |
Clump-forming perennial; dies back in winter |
| Height and spread |
Usually 20–40 cm tall, 30–50 cm wide |
| Flowers |
Deep yellow, buttercup-like, March to May |
| Position |
Full sun; tolerates light shade |
| Soil |
Rich, wet, boggy soil or shallow water |
| Pond depth |
0–10 cm of water over the crown |
| Hardiness |
RHS H7 – very hardy (below -20°C) |
| Native to |
UK and Ireland (native wild flower) |
Where to plant marsh marigold
- The shallow shelf of a wildlife or garden pond, 0–10 cm deep
- Wet, boggy ground beside a pond or stream
- An aquatic basket on the shelf of a smaller pond
Is marsh marigold good for wildlife?
Yes. It is on the RHS Plants for Pollinators list, and its early flowers give insects nectar when little else is in bloom. The Wildlife Trusts note that the leaves give frogs shelter at the water's edge.
How to plant and care for it
Plant in an aquatic basket in spring or summer and stand it so there is no more than 10 cm of water over the crown. Keep the soil wet all year. Cutting back the old foliage after flowering can encourage a second, smaller flush in autumn.
Is marsh marigold poisonous?
Yes, if eaten raw, and the sap can irritate skin, so wear gloves when dividing it. It is also harmful to grazing animals such as cattle and horses.
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 cost less per plant. The 2x Pot & Compost option is two plants supplied with pots and compost.
