Gladiolus 'Black Jack' (L)

Grow in fertile, well-drained soil in full sun, planting the corms 15cm deep in spring, on a bed of sharp sand to aid drainage; in frost-prone areas, lift when the leaves turn yellow-brown, and store the new corms in a dry, frost-free place until the following spring; in milder areas, add a thick dry mulch over winter

No pruning required, flowers may need staking with a cane. See staking: perennials

Propagate by division, separating cormlets when dormant

May be susceptible to thrips, aphids, slugs and snails

May be susceptible to gladiolus corm rot, grey moulds (Botrytis), Fusarium bulb rot, gladiolus core rot, gladiolus dry rot, gladiolus scab and neck rot, fungal leaf spot, and virus diseases