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Perennial flax is a slender-stemmed plant with bluish-green leaves that grows on dry, calcareous steppes, stony slopes and sparse grassland from Europe to the Caucasus, Anatolia and Central Asia. Its sky-blue, five-petalled flowers open early in the morning and most of them drop their petals in the afternoon; new flowers open every day. Nectar collects in small glands at the base of the petals; honey bees come regularly in the morning for nectar and pollen.
It flowers for several weeks from May to July; in cool places it can continue into August.
It has no honey of its own; it makes a small contribution to mixed steppe and highland honeys.
It is very drought-tolerant and suits dry bee gardens, flower-strip mixtures and banks. It self-seeds and stays put for years. Because visits are concentrated in the morning, spraying in the surrounding area should be left until the evening.