Turkestan onion

Sun

Full sun; tolerates light shade, but flowers best in sun.

Water

Water moderately while leaves are growing, allowing the soil surface to dry between waterings. Keep relatively dry during summer dormancy.

Soil

Well-drained sandy, gritty or loamy soil. Avoid heavy soil that stays wet, particularly in winter and during summer dormancy.

Height

0.5-1 ft (0.15-0.3 m)

Spread

0.5-1 ft (0.15-0.3 m)

Flowers

Late spring to early summer; dense, spherical heads of pale pink to silvery-lilac flowers.

Foliage

A few broad, thick, blue-grey leaves form a low rosette, sometimes with reddish-purple edges or undersides. Leaves yellow and die back after flowering.

Growth

Moderate seasonal growth; slowly forms small clumps through offsets.

Care needed

Low

• Pollinators
• Deer resistant
• Drought tolerant
• Heat tolerant
• Low allergen

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Easy

Toughness

Very tough

Pick your zone, country, light and whether you have pets.

1. Planting day

   0.5 ft (0.15 m)

2. After 1 year

   0.7 ft (0.21 m)

3. After 2 years

   0.7 ft (0.22 m)

   full size

About 1 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Toxic

Growth rate

Slow

• Plant bulbs in autumn with about 3 in (8 cm) of soil above their tips, spacing them 6-8 in (15-20 cm) apart.
• Water during prolonged dry spells while leaves are green; stop routine watering once the foliage dies back.
• In poor soil, apply a light dressing of bulb fertilizer as leaves emerge; avoid heavy feeding.
• Keep moisture-retentive mulch away from the crowns; a gravel surface mulch suits this plant.
• Lift and separate crowded offsets after the leaves have died back, then replant promptly.

Pruning. Cut off spent flower stems after flowering, or leave the seed heads until they lose their shape. Remove leaves only when completely yellow or brown.

Autumn

Plant bulbs in a sunny position with sharp drainage.

Winter

Check that beds and containers drain freely; move pots out of persistent rain if necessary.

Early spring

Watch emerging leaves for slugs and snails, and feed lightly if the soil is poor.

Late spring

Water during extended dry weather while the plant is actively growing.

Early summer

Remove spent flower stems if seed heads are not wanted, leaving the foliage intact.

Summer

Allow the bulbs to rest relatively dry; divide crowded clumps after foliage has died back.

• Plant in small groups at the front of a sunny border, where the broad leaves remain visible.
• Set among gravel and rocks for a contrast between rounded flower heads and angular stone.
• Grow in shallow-looking but adequately deep, freely draining containers for a seasonal courtyard display.
• Combine with low, drought-tolerant perennials that fill the gaps after the bulbs become dormant.

Garden styles it suits: Dry gravel garden, Alpine rock garden, Architectural minimal, Modern courtyard, Small-space and Pollinator garden.

Plant it with: Creeping thyme, Rock rose, Candytuft, Blue fescue and Low-growing stonecrop.

Wildlife: Flowers attract bees and other pollinating insects. Usually avoided by deer and rabbits, although no plant is completely browsing-proof.

• Bulb rot in wet soil: improve drainage or move bulbs to a raised bed; discard soft or rotten bulbs.
• Slugs and snails damaging young leaves: inspect emerging growth and use barriers, hand-picking or locally approved controls.
• Poor flowering in shade or crowded clumps: move to full sun and divide crowded bulbs after dormancy begins.
• Yellowing leaves after flowering: this is normal dormancy; leave foliage until it has fully died back and reduce watering.

All parts, including the bulbs, contain compounds toxic to cats, dogs and horses; ingestion can damage red blood cells and cause serious anaemia. Keep bulbs away from pets. This ornamental onion is not a food plant; eating it may cause stomach upset in people, and species-specific information on safe quantities is limited.

• Star of Persia (Allium cristophii)

  Has much larger, more open heads of metallic purple, star-shaped flowers and narrower, strap-like leaves.

• Tumbleweed onion (Allium schubertii)

  Has an open, firework-like flower head with flower stalks of very unequal lengths, rather than a compact globe.

The name karataviense refers to the Karatau Mountains of Central Asia, while Turkestan onion refers to its Central Asian origin.

Propagation. Separate offsets after the foliage dies back and replant in well-drained soil. Seed can be sown when ripe, but seedlings take several years to flower and named cultivars may not come true.

Accepted botanical name

Allium karataviense

Native range

Afghanistan, Kazakhstan, Kirgizstan, Tadzhikistan and Uzbekistan.

Sources: GBIF (CC BY 4.0) and Trefle (CC BY 4.0). The care and design notes are LandscapeGPT's own.