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Herbaceous Perennial
Clump-forming
old H4 (hardy)
Dark Blue in Autumn and Summer
Green in Autumn and Summer
0.5-1 metres
0.1-0.5 metres
2-5 years
willow gentian
Gentianaceae
Gentiana can be annuals, biennials, herbaceous or evergreen perennials, mostly with showy, trumpet or salver-shaped flowers
G. asclepiadea is an herbaceous perennial to 1m, with arching stems bearing lanceolate leaves, and trumpet-shaped deep blue flowers 4-5cm in length in the upper leaf axils in late summer and early autumn
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Grow in light, humus-rich soil that is reliably moist but well-drained; avoid chalky soils. It needs shade from hot sun but in areas with cool, damp summers it can tolerate sun
Propagate by seed sown in pots in an open frame as soon as seed is ripe
Cottage/Informal Garden, Flower borders and beds, Cut Flowers, Rock Garden or Underplanting of Roses and Shrubs
Generally pest free
Generally disease free
© The Royal Horticultural Society 2011 / RHS Registered Charity № 222879/SC038262