Alisma plantago-aquatica
Frog's-bit
Common names: Common frog's-bit, Water plantain
Photo: Christian Fischer · CC BY-SA 3.0 · Source
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Description
Alisma plantago‑aquatica, commonly known as frog’s‑bit, is a native riparian plant that produces conspicuous, loose white flower spikes that float above grass‑like leaf rosettes from June to September. It prefers shallow water at pond margins or permanently wet marsh zones, where it readily spreads to form natural stands. The plant attracts insects such as hoverflies and bees, making it a valuable component of naturalistic pond gardens. The plant is toxic; fresh sap contains irritants that can affect skin and mucous membranes, so it should not be consumed and gloves are recommended when handling or propagating.
Care instructions
Frog’s‑bit thrives best in shallow water 5–20 cm deep over the root ball, or in a pot with loamy pond soil. Place it in a sunny to partially shaded spot on the bank for most reliable flowering. Deadhead spent spikes in late summer to control seed spread and keep the plant compact. The root mass remains frost‑free underwater in winter; pruning dead leaves in spring is sufficient maintenance. Divide larger clumps every few years in spring to rejuvenate the stand and prevent uncontrolled spread in the pond.
Soil & site
Soil pH
Soil type
moist, nutrient-rich, loamy, clayey
Feeding
Medium feeder
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