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Round-headed garlic

Allium sphaerocephalon · Amaryllidaceae

The gardener's calendar

The right move for September

Ideal time to plant round-headed garlic: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.

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ID card

Flowering
June to July
Adult size
60 to 80 cm in height
Exposure
Full sun
Hardiness
Very hardy, down to -15°C
Foliage
Deciduous
Origin
Southern Europe and Central Asia
Growth
Fast
Soil type
Well-drained, light to medium

Care

Exposure

Round-headed garlic thrives in full sun, with a minimum of 6 hours per day. This exposure encourages generous flowering and well-formed bulbs. Avoid overly shaded areas where flowering would be compromised.

Soil and Planting

Plant bulbs in autumn (September to November) in well-drained, stony or sandy soil preferably. Planting depth should be 2 to 3 times the bulb's height. Overly compact or damp soil encourages rot: loosen it and raise slightly if necessary.

Watering

Water moderately during the active growth phase in spring. Once established, the plant tolerates summer drought well. After flowering and during summer, gradually reduce watering to encourage the bulb to rest.

Fertilizer

A balanced fertilizer or one rich in phosphorus and potassium, applied in spring when growth begins, is sufficient. Avoid excess nitrogen, which promotes foliage at the expense of flowering. A single application is generally enough for the season.

After-Flowering

Let the foliage dry naturally on the plant; it replenishes the bulb's reserves. Cut the stems only when completely brown and dry, generally in July-August. Spent flowers can be removed for aesthetics, but this is not necessary.

Pests and Diseases

Round-headed garlic is generally resistant. The main risk is bulb rot from poorly drained soil or excessive moisture. Aphids may occasionally visit without causing major damage. Ensure good air circulation and optimal drainage to prevent any fungal issues.

Did you know?

Allium sphaerocephalon, also called 'drumstick allium' or 'ornamental garlic,' fascinates with its highly architectural spherical flower head composed of small pink-purple flowers. Although less well-known than its edible cousins (onion, leek), it produces tiny edible bulbils that are rather tasteless; in the Middle Ages, botanical curiosity enthusiasts cultivated it more for its striking appearance than for its flavor.

Where to buy it

Plant the bulbs in autumn for spring flowering. Pick a plant with healthy foliage and roots that are not exposed. Best time: from September to November.

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Tips generated and checked by Viridia — adapt them to your local climate.