Iris 'Katharine Hodgkin' (Katharine Hodgkin iris) care

Light

Most houseplants will scorch where iris 'katharine hodgkin' thrives. Give it the windowsill you'd otherwise leave empty because everything else burned there. Full sun, especially in late winter and spring, ripens the bulb and ensures flowering. A warm, open spot that bakes in summer dormancy gives the best long-term performance. A plant moved abruptly from low light to direct sun bleaches in 48 hours — always acclimatise over a week.

Watering

Aim for water during autumn-to-spring growth; keep dry in summer dormancy for iris 'katharine hodgkin', but treat that as a starting point rather than a rule. A south-facing summer windowsill will dry the pot twice as fast as a north-facing winter room. Lift the pot; if it feels noticeably lighter than it did wet, water it. Needs moisture while in leaf and flower from late winter into spring, then a dry summer rest to ripen the bulb. Summer wet is the main cause of decline and bulb rot.

Soil and pot

Iris 'Katharine Hodgkin' grows best in sharply drained, gritty, neutral to alkaline soil. Demands very free drainage; add grit to beds or grow in alpine troughs and pots. It dislikes summer moisture, so dry, lean, slightly alkaline soils suit it best. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Iris 'Katharine Hodgkin' sits happiest at around Ambient outdoor humidity and -20 to 24°C (-4 to 75°F). A hardy alpine-style bulb with no humidity needs. Open, airy conditions and dry summers prevent fungal problems such as ink-spot disease. If you keep the room above year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed iris 'katharine hodgkin' sparingly. Apply a low-nitrogen, high-potassium feed such as a tomato-type fertiliser as growth begins and again after flowering to build the bulb for next season. Avoid rich or high-nitrogen feeds, which favour leaf over flower and encourage rot. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on iris 'katharine hodgkin' in the Growli community. Each is annotated with the most common cause so you know where to start.

• Summer wet and rot — Moist soil during dormancy rots the bulbs. Plant in sharply drained ground or lift and store dry, or grow in pots kept dry in summer.
• Ink-spot disease — A fungal disease causing black blotches on bulbs and leaves; destroy affected bulbs and avoid replanting reticulata irises in the same spot.
• Bulb splitting into non-flowering grass — Bulbs can break into many small offsets that produce only leaves; feed with potassium after flowering and grow lean to maintain flowering size.
• Slug and snail damage — Tender late-winter flowers are grazed by slugs and snails; protect emerging buds in damp weather.

Propagation

Lift dormant clumps in summer and separate the offset bulblets, replanting in autumn at about 8-10 cm deep. Larger bulbs flower the following winter; small offsets take a year or two to reach flowering size. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Iris 'Katharine Hodgkin' is toxic to pets. ASPCA lists Iris species as toxic to cats and dogs. The bulbs hold the strongest concentration of irritant terpenoids and glycosides (irisin, iridin), causing drooling, vomiting, diarrhoea and irritation. Keep bulbs out of reach when planting or storing. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Iris 'Katharine Hodgkin' deep-dive guides

Every aspect of iris 'katharine hodgkin' care, each with its own calibrated guide:

• Iris 'Katharine Hodgkin' watering schedule
• Iris 'Katharine Hodgkin' light requirements
• Best soil mix for iris 'katharine hodgkin'
• Iris 'Katharine Hodgkin' fertilizing guide
• When to repot iris 'katharine hodgkin'
• How to propagate iris 'katharine hodgkin'
• Iris 'Katharine Hodgkin' growth rate & size
• Iris 'Katharine Hodgkin' cold hardiness
• Iris 'Katharine Hodgkin' temperature & humidity
• Is iris 'katharine hodgkin' toxic to cats & dogs?
• Is iris 'katharine hodgkin' toxic to cats?
• Is iris 'katharine hodgkin' toxic to dogs?
• Getting iris 'katharine hodgkin' to bloom

Featured in these plant shortlists

Iris 'Katharine Hodgkin' qualifies for 5 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best flowering houseplants — Indoor plants grown for their blooms — selected from the flowering species in Growli’s plant-care library.
• Houseplants toxic to cats & dogs — The common houseplants the ASPCA lists as toxic to cats and dogs — the ones to keep out of reach, each with its symptoms and a safe alternative.
• Best small & tabletop houseplants — Compact houseplants that stay under about 40 cm — desk, shelf and windowsill plants that never outgrow a small space.
• Best houseplants for full sun — Houseplants that want direct sun — the species for a hot south or west-facing windowsill where shade-lovers scorch.
• Best houseplants for a cool room — Houseplants that tolerate cool conditions down to about 10°C — for an unheated spare room, hallway, porch or a home kept cool.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Iris 'Katharine Hodgkin' is also known as Katharine Hodgkin iris, dwarf reticulata iris, and blue yellow miniature iris.

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