Iris pseudacorus seed Yellow Flag

LATIN NAME: Iris pseudacorus

COMMON NAME: Yellow Flag, Yellow Iris, Water Flag

The yellow flag is the great golden iris of the waterside, and its tall, bright flowers light up the margins of ponds and rivers in early summer. It grows as a vigorous, rhizomatous perennial, reaching up to a metre and a half, with bold, upright, sword-shaped, grey-green leaves and, in early summer, tall, upright stems carrying several large, rich yellow flowers, each with the distinctive iris structure of three falls, some with a brown or orange signal patch, and three standards. It is a native of Europe, western Asia and northwest Africa, and it is one of the most beautiful and most familiar plants of the waterside, growing happily in the shallow water and wet ground along the edges of ponds, rivers and marshes.

The yellow flag belongs to the iris family, Iridaceae, and it is native to Europe, western Asia and northwest Africa. Its specific epithet pseudacorus means false acorus, referring to the similarity of its leaves to those of the sweet flag, and it grows in wet ground and shallow water.

Scientific Research & Plant Biotechnology

The yellow flag has a genuine and growing place in both ecological and horticultural research. It has been studied in ecology and in the research on wetland plants, since it is one of the most important plants of the waterside, and researchers have examined its role in the wetland ecosystems, its value to wildlife and its growth in the shallow water, while its ability to take up nutrients from the water has also made it of interest in research on wetland treatment, where plants are used to clean the water. The plant has also been studied in horticulture, since it is one of the most beautiful and most widely grown of the water irises, prized for its rich yellow flowers, and it is grown around the world at the margins of ponds and streams, while a number of garden forms have been selected. The species has also been studied in botany, since the irises are a large and fascinating genus. For an iris of such golden beauty, the yellow flag has a rich and growing record of research.

Ecological & Economic Value & Wide Applications

Ecologically, the yellow flag is a keystone of the waterside. Its golden flowers feed bees and other pollinators in early summer, its roots hold the wet ground, and its bold clumps give cover and nesting sites for wildlife, while it has been a beloved plant of the ponds and rivers of Europe for a long time.

Its economic value lies mainly in horticulture and in wetland care. It is one of the most beautiful and most widely grown of the water irises, prized for its golden flowers, and it is used to plant the margins of ponds and streams, while its ability to take up nutrients from the water has made it valuable in the planting of constructed wetlands. For a grower, the yellow flag is an easy and rewarding plant, and for a gardener it brings golden bloom to the edge of the pond. The seeds are easy — sow them in a pot of moist compost in autumn, keep them cool and lightly watered, and they’ll sprout steadily over the following weeks, growing on into bold clumps for the waterside.

Use: Gardening. Landscape