Yellow Flag Iris 'Roy Davidson' (Iris pseudacorus): Variegated Water Iris

The Yellow Flag Iris 'Roy Davidson' is a distinctive cultivar of the vigorous European species Iris pseudacorus. It is prized for its variegated foliage, which adds season-long interest to water gardens.

Variegated Foliage and Yellow Blooms

'Roy Davidson' features the typical large, bright yellow flowers of the species (3 to 4 inches across) in late spring. Its standout feature is the foliage: the sword-like leaves are boldly striped lengthwise with creamy yellow and green. The variegation is stable and highly ornamental, glowing in the spring garden even before bloom.

Water Garden Culture

Iris pseudacorus is a true marginal aquatic plant. It thrives in shallow water (up to 6 inches deep) or consistently saturated mud. It is ideal for pond edges, bog gardens, and wet meadows. It can be aggressive in ideal conditions, so plant with awareness. 'Roy Davidson' is hardy in zones 4 to 9. The variegation is most vivid in full sun.

Hybridizer and History

This cultivar was hybridized by B. Hager and introduced in 1987. It is one of the few variegated forms of the Yellow Flag Iris, offering a unique foliage accent for water features.