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Large-Flower Primrose Willow

Ludwigia grandiflora ssp. grandiflora

Plant Description

An emergent perennial aquatic plant with smooth alternate leaves attached to pubescent stems; yellow flowers with 5-6 petals. During early growth stages, leaves are usually rounded ; once it begins to flower, the leaves lengthen – becoming lanceolate to elliptic.

Plant Details

Life Forms
Soil and Moisture Conditions
Suggested Actions
Shade Preference
Mature Height flowering stems can rise up to 3 feet above the water
Distribution In Rivers and other water bodies up and down the west coast and in the southeastern US.
Control Prevention is the best strategy , followed by early detection and rapid response. Report infestations to OregonInvasivesHotline.org.
Reproduction and Spread Often spread as an ornamental for Aquatic Gardens. Spreads by seeds and stem fragments with movement of water, waterfowl, and recreational equipment.
Introduced First observed in California and Oregon in the 1940s, but spreading rapidly in the last 20-30 years.
Look Alikes other Ludwigia species
Impact Clogs Waterways, degrades wildlife habitat, negatively impacts water quality and Aquatic recreation.
More Info
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