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© E. Branquart
© E. Branquart
© E. Branquart

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© E. Branquart
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Mimulus guttatus


Common name: Monkeyflower
Synonyms: Mimulus equinus, Mimulus grandiflorus, Mimulus langsdorfii, Mimulus luteus
Origin: North America
Plant type: Herbaceous
Life cycle: Perennial
Code of conduct: Annex I (consensus list)
Invasive status (ISEIA protocol): Watch list
Main ornemental function: Mixed border • Plants for ponds


Herbaceous plant with layering or semi erect stems, up to 80 cm tall in wetlands. Shorter on dryer soils. Stems are hairless at the base but hairy in the superior part. Opposite leaves, oblong with toothed margin. Yellow flowers.


High dispersal capacities. This plant mainly reproduces by seeds, dispersed by wind and water. M. guttatus grows fastly. Germination period is short. It can also reproduce vegetatively by stem cuttings and stem layering. Fragments of stems can easily create new individuals.


The Monkeyflower is found on wet habitats like riverbanks, lakesides. It typically grows in disturbed areas of riverbanks (bare sediments and boulders) and is rarely found in adjacent marshes and wet meadows (where its establishment seems to be hindered by mollusc herbivory). This species colonises gaps in established vegetation.


Species classified B2 in Belgium. This species is naturalised in several European countries. Its distribution in increasing in Germany and Poland. Invasion are reported in Scotland. In Belgium, only small populations of Mimulus populations are observed. UK studies show that Mimulus's impact is mainly restricted to disturbed sediment communities. It often occurs in discrete patches along streams and its populations are subjected to strong inter-annual variations. However, when growing in dense populations, Mimulus guttatus significantly alters both species composition and structure of riparian plant communities (Sparganio-Glycerion fluitantis, Bidentetea tripartiti). It mainly competes with widespread ruderal plants. Mimulus guttatus can also alter chemical properties of soils. For more information about this species, click here


Do not plant, do not buy this species.

Possible native alternatives

Main ornemental function

Mixed border
Plants for ponds

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