Mimulus guttatus (now listed as Erythranthe guttata), known as monkey flower, is a short-lived, mat-forming perennial with toothed, oval, mid-green leaves on hollow stems. In summer it carries bright yellow, trumpet-shaped flowers, often spotted red or reddish-brown in the throat.

Monkey flower at a glance

Botanical name Erythranthe guttata (syn. Mimulus guttatus)
Common name Monkey flower
Plant type Short-lived, mat-forming perennial; dies back in winter
Height and spread About 30 cm to 1 m tall (sources differ), 50–100 cm wide
Flowers Bright yellow trumpets, often spotted red in the throat, July to September
Position Full sun or part shade
Soil Permanently moist, fertile, humus-rich soil or wet mud
Pond depth Wet mud at the pond edge; no source gives a water depth
Hardiness RHS H5 – hardy in a cold winter (-15 to -10°C)
Native to Not UK native; naturalised along UK streams and ponds

Where to plant monkey flower

  • Wet mud at the edge of a garden pond
  • Bog gardens with permanently moist, fertile soil
  • Full sun or part shade

Does monkey flower spread?

Yes. It spreads by seed and by stems that root into wet mud, and it has escaped along streams, rivers and ponds in the UK. It is not legally restricted, but keep it to garden ponds and do not plant it beside natural watercourses.

How to plant and care for it

Plant in spring in soil that stays wet. It is a short-lived perennial. Watch for slugs and snails; it may also get powdery mildew.

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 - 10cm

Light: Full sun or part shade

Hardiness: Hardy

Height and spread: 40 - 80cm tall, 50 - 100cm 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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