Echinops bannaticus (Blue Globe Thistle)

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Echinops spp.

globe thistles

Asteraceae Europe, Asia, and Africa

Attracts Pollinators Attracts Butterflies Deer Resistant Drought Tolerant

SunFull Sun

WaterLow · drought-tolerant

HardinessZones 3–9

Overview

Echinops is a genus of about 120 species of stout, spiny perennials and biennials in the aster family (Asteraceae), native to Europe, Asia, and Africa. Plants form upright clumps 2–6 feet (0.6–1.8 m) tall on rigid, often white-woolly stems, with deeply cut, spiny-margined leaves 4–14 inches (10–35 cm) long, dark green above and gray-felted beneath. The flower heads differ from most asters in being single-flowered units packed into a spherical head 1–2.5 inches (2.5–6 cm) across, in steel-blue, violet, or white. The globes open in mid- to late summer and draw bees and butterflies. Dried heads hold their shape and color for cutting. Plants grow from a deep taproot that makes established clumps drought-tolerant but hard to move. E. ritro and E. bannaticus are the common garden species. Stems and leaves are sharply spiny, and the deep taproot lets plants self-seed into a long-lived stand.

Native Range

Native to central and southern Europe, the Mediterranean, central and western Asia, and the mountains of tropical Africa. Grows on dry, rocky slopes, steppe, open grassland, and roadsides in well-drained soils from sea level to about 9,000 feet (2,700 m).

Suggested Uses

Grown in sunny borders, gravel and prairie-style plantings, and pollinator gardens, spaced 24–36 inches (60–90 cm) apart. The spherical heads are cut fresh or dried for arrangements. The spiny foliage and deep root suit dry, low-water plantings but make plants hard to move once set.

How to Identify

Recognized by spherical flower heads of steel-blue to violet, 1–2.5 inches (2.5–6 cm) across, held on rigid stems above deeply cut, spiny gray-green leaves with white-felted undersides. Each globe is built from many one-flowered units rather than a single composite head. The round spiny heads and the felted, thistle-like foliage separate Echinops from the true thistles (Cirsium) with their flattened heads.

Appearance

Size & Dimensions

Height2' - 6'

Width/Spread2' - 3'

Colors

Flower Colors

Foliage Colors

Bloom Information

Bloom Period

~5 weeks

Summer

Flowering comes in mid- to late summer, generally July to September, lasting 4–6 weeks. The spherical heads open from the surface inward, holding color for several weeks, and dry on the plant afterward. Cutting heads before seed sets prolongs the display and limits self-seeding.

Detailed Descriptions

Flower Description

steel-blue, violet, to white

Foliage Description

gray-green with white undersides

Growing Conditions

Sun Requirements

SunFull Sun

Requires 6-10 hours of direct sunlight daily

• Full Sun: 6+ hours of direct sunlight

• Partial Shade: 3-6 hours of direct sunlight

• Full Shade: Less than 3 hours of direct sunlight

Soil Requirements

pH Range6.0 - 7.8(Neutral)

357912

Soil Types

loam sand chalk rocky

Drainagewell drained

Water & Climate

Water Needs

Low

Frost Tolerance

hardy

Time to Maturity

2–3 years

Drought Tolerance

Drought tolerant when established

Care & Maintenance

Care Guide

Grows in full sun and average to poor, well-drained soil with low water once established, tolerating drought, heat, and lean, rocky ground. Rich or wet soil produces floppy stems and shortens the plant's life. The deep taproot makes mature clumps drought-tolerant but hard to divide or transplant. Plants self-seed and can spread into a colony if heads are left to ripen. Aphids gather on stems, and root rot follows wet winter soil. Staking supports tall stems in exposed sites.

Pruning

Cut stems to the ground in late fall or early spring as the foliage dies back. Deadheading spent globes before seed ripens prolongs bloom and prevents heavy self-seeding. Cutting some stems back by half in early summer yields shorter, sturdier, later-flowering growth.