Iris bucharica (Bokhara iris) — Clump-forming, upright

Overview

Iris bucharica is a clump-forming, upright perennial in the genus Iris, part of the Iridaceae family, with deciduous or evergreen; sword-shaped to grassy, often glaucous foliage. Iris bucharica grows best in full sun; some tolerate partial shade, and tolerates loam and chalk or sand; sharply drained for bearded kinds soils and neutral to slightly alkaline pH. Its UK hardiness is rated H5–H7. It is native to Afghanistan, Tadzhikistan and Uzbekistan.

About

Iris bucharica is a clump-forming, upright perennial in the iris family that bears white and yellow flowers from May to July. The plant carries sword-shaped, often glaucous leaves and can be either deciduous or evergreen. It favours full sun but will tolerate some light shade and prefers neutral to slightly alkaline, well‑drained soils on a south- or west-facing site. Handle with care: the plant is harmful if eaten and gloves are recommended when handling.

Wikipedia contributors, CC BY-SA 4.0 — Iris bucharica

About the genus

Iris takes its name from the Greek goddess of the rainbow, and for once the naming feels entirely earned. I can't think of another genus that covers so much ground — inky purples, burnt apricots, clean whites, blues that seem lit from inside — or so many situations. There are bearded irises that want their rhizomes baked in full sun, Siberian types happy in ordinary border soil, and species that will sit contentedly at the edge of a pond. What they share is the flower: three petals standing up, three falling away, built with a kind of architectural confidence most plants never attempt. Even out of bloom the foliage earns its place — those upright fans of blue-green leaves hold a border together for months. I grow them for the fortnight in May and June when nothing else in the garden can compete, and I've made my peace with that. Some plants are for the long haul. An iris is an event.

Written by Henry

In the garden

Iris bucharica is a perennial member of the Iridaceae native to Afghanistan, Tadzhikistan and Uzbekistan. In the UK it flowers from May to July, producing white and yellow blooms that sit above a clump of sword-shaped, often glaucous leaves. The habit is upright and clump-forming, making it a clear structural element where it is planted. Plant where it receives full sun; some plants tolerate partial shade but best performance comes from a south- or west-facing aspect. It prefers neutral to slightly alkaline soils—loam, chalk or sand are all suitable—provided the soil is well drained. The species is rated H5–H7 (hardy to fully hardy), so it will withstand typical UK winters and can be grown in both exposed and sheltered situations. Use Iris bucharica where you need a late spring to early summer floral lift in sunny borders, gravelly or sharply drained areas and on open slopes. Avoid heavy, poorly drained ground. Wear gloves when planting or dividing because the plant is harmful if eaten; keep pets away for the same reason. The sword-shaped leaves form a neat clump that persists into the season, giving architectural structure after flowering.

Growing conditions

Best soil and position for Iris

Sunlight: Full sun; some tolerate partial shade
Soil type: Loam, chalk or sand; sharply drained for bearded kinds
Soil pH: Neutral to slightly alkaline
Soil moisture: Well drained; Siberian and Japanese kinds need moisture-retentive soil
Aspect: South or west facing
Exposure: Exposed or sheltered
UK hardiness: H5–H7

Plant details

Iris bucharica size, habit and characteristics

Plant type: Perennial
Habit: Clump-forming, upright
Foliage: Deciduous or evergreen; sword-shaped to grassy, often glaucous
Native to: Afghanistan, Tadzhikistan, Uzbekistan
Toxicity: Harmful if 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 Iris bucharica

Cultivation: Plant bearded irises with the top of the rhizome exposed so it can bake in summer sun; beardless kinds sit just below the surface in richer, damper ground. Feed with a low-nitrogen fertiliser after flowering and keep the rhizomes clear of mulch and encroaching neighbours.
Pruning: Remove spent flower stems at the base. Trim the outer leaves back by about half in late autumn to reduce overwintering fungal spores, leaving the central fan intact.
Propagation: Divide rhizomes six to eight weeks after flowering, discarding the old woody centre and replanting vigorous outer sections. Species come from seed, but named cultivars will not come true.
Pest resistance: Generally trouble-free, though iris sawfly and slugs damage foliage and thrips can disfigure buds.
Disease resistance: Prone to leaf spot, and to rhizome rot wherever drainage is poor or planting too deep.

Frequently asked questions

How do I grow Iris bucharica?

Plant bearded irises with the top of the rhizome exposed so it can bake in summer sun; beardless kinds sit just below the surface in richer, damper ground. Feed with a low-nitrogen fertiliser after flowering and keep the rhizomes clear of mulch and encroaching neighbours.

Where is the best place to plant Iris bucharica?

Iris bucharica prefers full sun; some tolerate partial shade. It suits exposed or sheltered positions.

What soil does Iris bucharica need?

Iris bucharica grows best in loam and chalk or sand; sharply drained for bearded kinds soil. It prefers neutral to slightly alkaline soil. Aim for soil that stays well drained; siberian and japanese kinds need moisture-retentive soil.

How do I prune Iris bucharica?

Remove spent flower stems at the base. Trim the outer leaves back by about half in late autumn to reduce overwintering fungal spores, leaving the central fan intact.

Is Iris bucharica hardy in the UK?

Iris bucharica has an RHS hardiness rating of H5, meaning it is hardy in most of the UK, tolerating -15 to -10°C.

How do I propagate Iris bucharica?

Divide rhizomes six to eight weeks after flowering, discarding the old woody centre and replanting vigorous outer sections. Species come from seed, but named cultivars will not come true.

Is Iris bucharica toxic?

Harmful if 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 Iris genus

Browse all Iris →