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Globe thistle

Echinops sphaerocephalus · Asteraceae

The gardener's calendar

The right move for September

Ideal time to plant globe thistle: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.

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ID card

Foliage
Deciduous
Flowering
July to September
Mature size
32 to 59 inches tall × 24 to 35 inches wide
Growth
Fast
Hardiness
Very hardy, down to -4°F
Origin
Central and Southern Europe, Asia
Soil type
Well-drained, calcareous, poor to moderate

Care

Exposure

Place your echinops in full sun for abundant flowering and compact structure. It tolerates intense heat and windy locations. A minimum of 6 hours of direct daily sunlight is recommended to get the most beautiful flower balls.

Watering

Water moderately during the growing season, then reduce in summer since the plant tolerates drought well. Once established, it needs no supplemental watering except during prolonged dry spells. Avoid excess water that can rot the roots.

Soil

Echinops prefers well-drained soil, ideally calcareous or neutral. Poor, rocky soils suit it perfectly. Improve drainage in heavy soils by adding gravel or sand when planting.

Pruning and Cutting

Prune lightly in spring to balance the shape and remove dead wood. The ball flowers can be cut in late summer and left to dry on the plant for prolonged ornamental effect. You can also harvest them for dried flower arrangements.

Fertilizer

No fertilizer is needed in moderate soil. In very poor soil, a spring application of well-decomposed compost is sufficient. Avoid over-fertilizing, which promotes soft growth at the expense of flowering.

Diseases and Pests

Echinops is very resistant to diseases. In poorly drained soil, root rot can occur. Watch for spider mites during prolonged hot, dry periods. Good air circulation prevents most problems.

Did you know?

Echinops fascinated beekeepers and botanists of the 19th century: its dense spherical ball flowers attract bees and butterflies in massive numbers, making it a true pollen factory. Its scientific name, Echinops, comes from the Greek "echinos" (hedgehog) and "ops" (appearance), referring to its resemblance to a spiky ball.

Where to buy it

Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.

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