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Repotting guide

When & how to repot Juno Iris (Iris graeberiana)

Also called Juno iris, Graeber's iris.

More about juno iris

About Juno Iris

Iris graeberiana · also called Juno iris, Graeber's iris · flowering

Iris graeberiana is a Juno-section iris native to the mountain slopes and foothills of Central Asia (Tian Shan and Pamir-Alai ranges of Kyrgyzstan and Tajikistan), producing pale blue to white falls with a distinctive yellow-orange crest in mid-spring. Like all Juno irises, it has fleshy storage roots below the bulb that must be kept intact at planting. A summer baking in dry soil is critical — it is challenging in wet temperate climates without glass protection. Toxic to cats and dogs.

Mature size: 20–40 cm (8–16 in) tall in flower; bulbs produce fleshy roots that may extend 10–15 cm (4–6 in) outward.

Watch for — Fleshy root loss at planting: The thick, carrot-like storage roots are brittle and irreplaceable; losing them severely weakens or kills the plant. Prepare a wide, deep planting hole and lay the roots out gently before backfilling with gritty compost.

How to tell juno iris needs repotting

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

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 juno iris

Every 2–3 years, into bone-dry mix. Juno Iris's growth habit — upright, bulbous juno iris with broad, glossy, channelled leaves arranged alternately up the stem, all dying back by midsummer. — sets the pace. Iris graeberiana is a Juno-section iris native to the mountain slopes and foothills of Central Asia (Tian Shan and Pamir-Alai ranges of Kyrgyzstan and Tajikistan), producing pale blue to white falls with a distinctive yellow-orange crest in mid-spring. Like all Juno irises, it has fleshy storage roots below the bulb that must be kept intact at planting. A summer baking in dry soil is critical — it is challenging in wet temperate climates without glass protection. Toxic to cats and dogs.

What size pot to step juno iris up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Juno 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 juno iris

Spring or summer, while juno 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 juno iris

  1. Repot dry. Do not water juno iris for several days first. Working with dry roots and dry mix dramatically lowers the rot risk for a succulent.
  2. Pick a snug, fast-draining pot. Choose terracotta one size up at most, with a drainage hole. Have gritty very sharply drained, gritty, slightly alkaline loam ready.
  3. 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.
  4. Pot into dry mix. Set juno iris at its original depth in dry gritty mix, firming gently. Do not bury the stem deeper than it was.
  5. 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 juno 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 juno iris

Juno Iris wants very sharply drained, gritty, slightly alkaline loam. A pH of 7.0–8.0 replicating the limestone-based soils of the Central Asian habitat is ideal; incorporate 30–40% coarse grit by volume and add limestone chips. Avoid peat-based composts. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting juno iris — frequently asked questions

How often should you repot juno iris?

Every 2–3 years, into bone-dry mix for juno iris. Repot juno iris every 2–3 years into a snug pot of very sharply drained, gritty, slightly alkaline loam, 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 juno iris need?

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Juno 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. Use our pot size calculator to size it from the plant's current pot and root spread.

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

Spring or summer, while juno 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.

Should you water juno iris after repotting?

No — not straight away. Repot juno 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 juno iris after repotting?

Not immediately. Wait about 3 weeks after repotting juno 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.

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