Repotting guide

When & how to repot Bokhara Iris (Iris bucharica)

Also called Bokhara iris, Buchara iris, Juno iris.

More about bokhara iris

About Bokhara Iris

Iris bucharica · also called Bokhara iris, Buchara iris · flowering

Iris bucharica is a Juno-group iris native to rocky hillsides and loess slopes of Tajikistan and north-eastern Afghanistan, prized for its large golden-yellow and white flowers borne in the leaf axils in mid-spring. It produces fleshy storage roots below the bulb that must not be damaged at planting or division. Free-draining, alkaline soil and a dry summer baking period are the single most critical requirements. Toxic to cats and dogs.

Mature size: 30–45 cm (12–18 in) tall in flower; individual bulbs spread to 8–10 cm (3–4 in) with fleshy storage roots extending outwards.

Watch for — Bulb rot from summer moisture: The primary cause of failure in UK gardens; the fleshy storage roots are especially prone to rot in wet summers. Lift bulbs after foliage dies back, dry thoroughly, and store in dry sand, or protect in situ with a cloche.

How to tell bokhara iris needs repotting

Repotting on a calendar is less reliable than reading the plant. For bokhara iris, watch for these signs:

Roots growing out of the drainage holes, or the rootball lifting the plant proud of the rim.
Soil that has shrunk away from the pot sides and no longer holds water.
The pot is unstable because the plant has grown top-heavy.
Old, compacted, broken-down mix that stays wet too long — for a succulent that is a rot risk, so refresh it even if the pot size is fine.

For the underlying biology of a pot-bound root system and why it stalls a plant, see our guide to spotting and fixing a root-bound plant.

How often to repot bokhara iris

Every 2–3 years, into bone-dry mix. Bokhara Iris's growth habit — upright, bulbous juno iris with glossy channelled leaves arranged alternately up the stem; fully deciduous in summer. — sets the pace. Iris bucharica is a Juno-group iris native to rocky hillsides and loess slopes of Tajikistan and north-eastern Afghanistan, prized for its large golden-yellow and white flowers borne in the leaf axils in mid-spring. It produces fleshy storage roots below the bulb that must not be damaged at planting or division. Free-draining, alkaline soil and a dry summer baking period are the single most critical requirements. Toxic to cats and dogs.

What size pot to step bokhara iris up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Bokhara Iris stores water and rots in a large pot of slow-drying soil. A tight terracotta pot that dries fast is far safer than a generous plastic one. Never up-pot a succulent by several sizes.

Not sure of the exact diameter? Our pot size calculator takes the current pot and root spread and tells you the right next size — it deliberately recommends a single step up, never a big jump.

The best time of year to repot bokhara iris

Spring or summer, while bokhara iris is in active growth and warm, is best — roots recover fastest then, and the plant is not sitting in cool damp soil. Avoid repotting a succulent in winter dormancy.

Step-by-step: repotting bokhara iris

Repot dry. Do not water bokhara iris for several days first. Working with dry roots and dry mix dramatically lowers the rot risk for a succulent.
Pick a snug, fast-draining pot. Choose terracotta one size up at most, with a drainage hole. Have gritty sharply drained, gritty alkaline soil ready.
Tip it out and clean the roots. Slide the plant out, crumble off the old soil, and trim any black, mushy or dead roots with clean snips.
Pot into dry mix. Set bokhara iris at its original depth in dry gritty mix, firming gently. Do not bury the stem deeper than it was.
Wait a week before watering. Leave it completely dry and out of harsh sun for about 7 days so any damaged roots callus. Only then water lightly.

Aftercare

Keep bokhara iris completely dry and out of fierce sun for about a week so any nicked roots callus before they meet moisture; watering a freshly repotted succulent is the classic way to rot it. Then resume the normal lean, dry rhythm. Do not fertilise for about 3 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for bokhara iris

Bokhara Iris wants sharply drained, gritty alkaline soil. Incorporate plenty of coarse grit or horticultural sand; a pH of 7.0–8.0 replicates the alkaline loess of the natural habitat. Raise beds or grow in terracotta pots in rainfall-prone climates. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting bokhara iris — frequently asked questions

How often should you repot bokhara iris?

Every 2–3 years, into bone-dry mix for bokhara iris. Repot bokhara iris every 2–3 years into a snug pot of sharply drained, gritty alkaline soil, ideally in spring or summer. Let it sit in dry soil and do not water for about a week afterwards so any nicked roots can callus. Over-potting and watering straight away is what rots succulents.

What size pot does bokhara iris need?

When is the best time of year to repot bokhara iris?

Should you water bokhara iris after repotting?

No — not straight away. Repot bokhara iris into dry mix and wait about a week before the first watering so any damaged roots callus over. Watering a freshly repotted succulent is the single most common way to rot one.

Should you fertilise bokhara iris after repotting?

Not immediately. Wait about 3 weeks after repotting bokhara iris. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.