Sisyrinchium montanum has iris-like foliage. The star shaped blue flowers appear along the upright, unbranched stems that form spikes in Summer. Each flower only lasts a day, but new buds continue to open during the flowering season. It has erect pedicels in fruit.

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Usually occurs as an escape from cultivation, and often close to habitation.

Flowers from early to mid-summer.

An evergreen, clump-forming plant.

Occasional, but widespread records of this plant occurring away from cultivation in Britain.

Rarely recorded away from cultivation in Leicestershire and Rutland.