Iris pseudacorus
Sumpf-Schwertlilie
Common names: Gelbe Schwertlilie, Wasser-Iris
Photo: ABesheva · CC BY-SA 4.0 · Source
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Description
Iris pseudacorus is a native wetland perennial that produces bright yellow flowers from May to July. It grows in dense, spreading clumps along pond edges, ditches, and wet meadows, providing an attractive vertical structure and serving as an important nectar source for bees. The sword‑shaped leaves give garden ponds and shorelines a clear, upright appearance. All parts of the plant, especially the rhizome, contain toxic compounds; contact with skin, mucous membranes, or eyes should be avoided, and the plant should not be ingested by children or pets.
Care instructions
Iris pseudacorus prefers a sunny to partially shaded location with constantly moist to shallowly flooded soil, ideally at a pond edge in 5–15 cm water depth. Plant the rhizomes in spring (around mid‑April, week 16) just below the soil surface in nutrient‑rich, loamy substrate. After flowering, cut back spent stands after seed maturity if you wish to prevent uncontrolled self‑seeded spread. Every three to four years, the clump can be divided in autumn to keep the plant vigorous and limit its spread. Wear gloves when dividing or cutting, as the plant sap can cause skin irritation.
Soil & site
Soil pH
Soil type
moist, nutrient-rich, humus-rich, clayey
Feeding
Medium feeder
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