Gladiolus cardinalis (waterfall gladiolus) — perennial

Overview

Gladiolus cardinalis is a perennial in the genus Gladiolus, part of the Iridaceae family. Gladiolus cardinalis grows best in full sun, and tolerates well-drained soils. Suggested uses include borders and cut flowers. It is native to S Africa (Cape).

About

Gladiolus cardinalis is a perennial in the iris family (Iridaceae) that flowers from July to September. Native to the Cape region of South Africa, it is grown from ornamental bulbs and is commonly known as waterfall gladiolus. It favours a sunny, sheltered position in a moist yet well-drained soil and is valued for borders and cut flowers. Wear gloves and other protective equipment when handling, and do not eat the bulbs as they are harmful to people and pets.

Wikipedia contributors, CC BY-SA 4.0 — Gladiolus cardinalis

About the genus

Gladiolus is a genus of perennial cormous flowering plants in the iris family (Iridaceae).

Wikipedia contributors, "Gladiolus", CC BY-SA 4.0 — Gladiolus

In the garden

Gladiolus cardinalis belongs to the Iridaceae and originates from the Cape region of South Africa. Cultivated from ornamental bulbs, it produces summer flower spikes that appear from July to September and are suited to cutting for vases. Its common name, waterfall gladiolus, reflects its South African origins and garden use rather than any specific UK microclimate requirement. Sit the bulbs where they receive full sun and where the soil is well-drained but retains some moisture; a sheltered aspect will help protect the vertical flower spikes from strong winds. Avoid heavy, waterlogged ground: the combination of good drainage with regular moisture through the growing season encourages consistent flowering. Mulching in spring can help conserve moisture without creating permanent wet conditions around the bulbs. Planting in a sunny mixed border or a dedicated cutting bed works well — stems make effective summer flowers from July through September. Take sensible precautions when handling the bulbs: they are ornamental bulbs that must not be eaten, you should wear gloves and protective equipment, and they are harmful to pets, so consult the HTA guide to potentially harmful plants for further information and contact numbers.

Growing conditions

Best soil and position for Gladiolus

Sunlight: full sun
Soil type: well-drained
Soil moisture: moist
Exposure: sheltered

Plant details

Gladiolus cardinalis size, habit and characteristics

Plant type: perennial
Suggested uses: borders, cut flowers
Native to: S Africa (Cape)
Toxicity: Ornamental bulbs, not to be eaten. Wear gloves and other protective equipment when handling. Pets: Harmful if eaten. For further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants

Care notes

Pruning and caring for Gladiolus cardinalis

Cultivation: Plant corms in spring after danger of frost has passed. Requires well-drained soil and regular watering during growth. Protect from strong winds.
Pruning: Remove spent flower spikes to encourage further blooming and prevent seed formation.
Propagation: By corm division or seed.

Frequently asked questions

How do I grow Gladiolus cardinalis?

Plant corms in spring after danger of frost has passed. Requires well-drained soil and regular watering during growth. Protect from strong winds.

Where is the best place to plant Gladiolus cardinalis?

Gladiolus cardinalis prefers full sun. It suits sheltered positions.

What soil does Gladiolus cardinalis need?

Gladiolus cardinalis grows best in well-drained soil. Aim for soil that stays moist.

How do I prune Gladiolus cardinalis?

Remove spent flower spikes to encourage further blooming and prevent seed formation.

How do I propagate Gladiolus cardinalis?

By corm division or seed.

Is Gladiolus cardinalis toxic?

Ornamental bulbs, not to be eaten. Wear gloves and other protective equipment when handling. Pets: Harmful if eaten. For further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants.

More in the Gladiolus genus

Browse all Gladiolus →