Caltha leptosepala (sold as Caltha palustris var. leptosepala), known as white marsh marigold, is a North American relative of the native kingcup. It has glossy, dark green, heart-shaped leaves and white flowers with a yellow centre, up to 4 cm across.

White marsh marigold at a glance

Botanical name Caltha leptosepala (sold as Caltha palustris var. leptosepala)
Common name White marsh marigold
Plant type Clump-forming perennial; dies back in winter
Height and spread About 30 cm tall and wide
Flowers White with a yellow centre, up to 4 cm across
Position Full sun or part shade
Soil Reliably damp to boggy, humus-rich, neutral to slightly acid soil
Pond depth 0–5 cm; happiest in bog conditions
Hardiness Fully hardy (no RHS H-rating published)
Native to Western North America (not UK native)

Where to plant white marsh marigold

  • A bog garden with reliably wet, humus-rich soil
  • The very edge of a pond, with no more than 5 cm of water over the crown
  • Next to the yellow kingcup for contrast

How to plant and care for it

Plant in spring or summer in damp to boggy soil, keeping the leaves out of the water. It dies back in autumn and regrows in spring.

Is it good for wildlife?

The flowers are a good source of pollen for insects.

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.

Pond depth: 0 - 5cm

Light: Full sun or part shade

Hardiness: Hardy

Height and spread: 20 - 40cm tall, 20 - 30cm wide

Planting and flowering months are shown in the calendar under the photos.

Bare root (7 cm, 9 cm, 1 litre, 3 litre): plants sent without a pot or compost, ready to plant straight away. The most economical way to plant a group.

Potted (9 cm, 1 litre, 3 litre): plants growing in our recycled, peat-free compost made in Lincolnshire. Larger sizes give a faster display.

Pack of 3 (7 cm bare-root, 9 cm bare-root, 1 litre bare-root, 3 litre bare-root): three plants of the chosen size at a lower price per plant.

2x Pot & Compost: two plants supplied with pots and compost.

Sizes shown with a line through them are currently unavailable.

At Lincs Plants, we strive to provide fast and reliable shipping to ensure your plants arrive in perfect condition. We offer 1-3 day shipping through a variety of dispatch methods to suit your needs.

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