How to Grow Gladiolus
Bulb
Gladioli bring upright drama and vivid colour to summer planting, producing tall spikes of funnel-shaped flowers that are particularly valuable for cutting. Although often called bulbs, they grow from corms. They are half-hardy in colder gardens, but reward a sunny, sheltered position with weeks of elegant flowers in shades from soft cream to deep crimson.
Planting
Plant corms from April to June in a sunny, sheltered site after severe frosts have passed. In colder parts of the UK, wait until the soil has warmed, or start a few corms under cover in pots. Set them 10 to 15 cm deep and about 15 cm apart in fertile, free-draining soil. Plant a small batch every two weeks until early summer for a longer cutting season. Position canes at planting time for tall varieties.
Care
Water during prolonged dry spells, especially as flower spikes form, and keep the soil lightly mulched to conserve moisture. Tie tall stems loosely to their supports before wind can bend them. Remove faded flowers from the bottom of each spike, but leave foliage until it yellows. In mild, free-draining gardens corms may overwinter outdoors; elsewhere, lift them after the foliage dies back and store frost-free in a dry, airy place.
Bloom time
Gladioli generally flower from July to September, with later succession plantings continuing into October in mild southern gardens. In cooler northern and Scottish gardens, flowering may begin later and finish earlier. Regular planting from spring creates a useful staggered display rather than one short flush.
Garden uses
Grow gladioli through sunny borders among softer perennials, or plant them in rows in a cutting patch. Their strong vertical lines add height behind lower summer flowers, while compact varieties suit large containers. The long-lasting spikes are excellent for indoor arrangements. Single-flowered varieties can also contribute nectar and pollen for visiting insects.
Tips
Choose a sheltered place, as exposed sites can snap the stems. Cut flowers early in the morning when the lowest floret is opening, and leave plenty of leaves on each plant. Sort corms while lifting, discarding any soft or damaged material. Keep labels with stored corms, as flower colours are difficult to identify when dormant.
Growing Gladiolus: frequently asked questions
How do I grow gladiolus in the UK?
Plant corms from April to June in a sunny, sheltered site after severe frosts have passed.
When does gladiolus flower?
Gladioli generally flower from July to September, with later succession plantings continuing into October in mild southern gardens.
How do I care for gladiolus?
Water during prolonged dry spells, especially as flower spikes form, and keep the soil lightly mulched to conserve moisture.
General guidance for UK gardens. Timing and hardiness vary by region and season; the RHS or a local garden centre can advise for your area. Page updated 18 Sep 2026.