Iris Butter and Sugar A good plant for a reliably moist border, and lovely reflected in a pool, Iris sibirica Butter and Sugar is a shorter and more delicate cultivar than most Siberian irises. It’s a spreading, clump-forming, deciduous, rhizomatous perennial with lots of very slender, upright, grey-green leaves. The large flowers, produced in midsummer on elegant, upright stems, are beautifully and subtly coloured, with palest cream standards with yellow-flushed, green-veined throats and pale yellow falls. Do not allow the soil to dry out while the plant is establishing. Iris Butter and Sugar holds the RHS Award of Garden Merit. Site: Tolerates exposureSoil: Humus-rich, reliably moist, well-drained, slightly acid to neutral soilPosition: Full sun or partial shadeSeason of interest: MidsummerHardiness: Very hardyHeight: 26” (65cm) Spread: 26” (65cm)