Polygala calcarea, the chalk milkwort, is a species of flowering plant in the family Polygalaceae, native to western Europe. It is a delicate mat-forming evergreen perennial growing to tall by broad, with spikes of small, vivid deep blue flowers in spring, and leathery, oval leaves.
Etymology The specific epithet calcarea means "relating to lime", though this plant will grow in a range of soils.
Cultivation It prefers sharply drained conditions, and is suitable for cultivation in an alpine garden.
Cultivars The cultivar 'Lillet' has gained the Royal Horticultural Society's Award of Garden Merit.
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