yellow flag iris
- Position: full sun or partial shade
- Depth of water: 5-25cm (2-10in)
- Soil: reliably moist or boggy soil
- Rate of growth: fast-growing
- Flowering period: July and August
- Flower colour: sulphur yellow
- Hardiness: fully hardy
Sulphur yellow flowers, often with brown markings appear from midsummer amongst the upright grey-green leaves. This native, yellow flag iris was once commonly found on marshy land and riversides and is ideal for planting at the margins of a large lake or pool. It also flourishes in deep, reliably moist soil that has been enriched with well-rotted organic matter.
- Garden care: Plant shallowly with the upper part of the rhizome sitting on the surface of the soil, incorporating a low nitrogen fertiliser in the planting hole. After planting remove the upper-most third of the leaves to minimise the incidence of wind-rock. In exposed areas stake with bamboo canes in early spring.
- Harmful if eaten
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