The willow gentian is an excellent perennial, soon forming a clump of upright leafy stems, with a pair of flowers from each leaf axil. The standard form has tubular blue flowers, but we also offer some variations on the theme. The colour forms usually come true from seed.

Gentiana asclepiadea is the most common form, in which the tubular, bright blue flowers are not widely flared at the end, unlike in 'Knightshayes'.