Geranium cinereum 'Lawrence Flatman' (Lawrence Flatman cranesbill) care

Light

Geranium cinereum 'Lawrence Flatman' needs sun on the leaves, not just bright ambient room light. Requires full sun for dense growth and prolific flowering. Shade thins the blooms and loosens the rosette. Give it the brightest, most open position available. A south or west-facing windowsill in the northern hemisphere is the default; anywhere else, expect the plant to stretch and pale out within a season.

Watering

Water geranium cinereum 'lawrence flatman' when the top few centimetres are dry; keep on the dry side once established. The actual day count varies with pot size, light, and season — the finger test (or lifting the pot to feel its weight) is more reliable than a fixed calendar. Empty any drainage saucer afterwards so the pot isn't sitting in water. Water moderately to establish, then sparingly — it strongly resents waterlogging and is prone to winter rot in wet soil. Prioritise drainage over watering frequency.

Soil and pot

Geranium cinereum 'Lawrence Flatman' grows best in gritty, sharply drained neutral to alkaline soil. Needs free-draining, lean-to-moderate soil and fails in heavy wet clay. Incorporate grit or coarse sand; use gritty compost in containers and aim for neutral-to-alkaline pH. 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

Geranium cinereum 'Lawrence Flatman' sits happiest at around Ambient outdoor humidity humidity and -15 to 24°C (5 to 75°F). An alpine perennial that wants airy, open conditions and no added humidity. Damp, stagnant air around the crown invites rot and mildew, so keep it well ventilated. 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 geranium cinereum 'lawrence flatman' sparingly. Minimal. Rich feeding ruins the compact habit. A single weak spring feed or a thin grit-and-compost dressing keeps it in good health. 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 geranium cinereum 'lawrence flatman' in the Growli community. Each is annotated with the most common cause so you know where to start.

• Crown and root rot — Caused by wet or heavy soil, particularly over winter. Plant in sharp drainage, grit the crown, and keep mulch off the rosette to prevent collapse.
• Loose growth in shade — Insufficient sun or overly rich soil leads to floppy, sparse-flowering plants. Move to full sun and keep the soil lean and gritty.
• Powdery mildew — A whitish film in humid, still air. Improve ventilation, avoid wetting the foliage, and trim back affected growth to refresh the clump.
• Vine weevil — Larvae feed on roots of pot- and trough-grown plants, causing sudden wilting. Check rootballs at potting time and use nematode controls if grubs are present.

Propagation

Propagate by division of the rosette in spring or by basal cuttings to keep the cultivar true. As a named selection it should not be raised from its own seed if uniform plants are wanted. 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

Geranium cinereum 'Lawrence Flatman' is mildly toxic to pets. Hardy Geranium (cranesbill) is not individually listed by the ASPCA; the ASPCA 'Geranium' entry covers Pelargonium (toxic principles geraniol and linalool), a different genus. Cranesbills are generally considered low-risk, but because this cultivar is unlisted, treat ingestion with caution and consult a vet to be safe. 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.

Geranium cinereum 'Lawrence Flatman' deep-dive guides

Every aspect of geranium cinereum 'lawrence flatman' care, each with its own calibrated guide:

• Geranium cinereum 'Lawrence Flatman' watering schedule
• Geranium cinereum 'Lawrence Flatman' light requirements
• Best soil mix for geranium cinereum 'lawrence flatman'
• Geranium cinereum 'Lawrence Flatman' fertilizing guide
• When to repot geranium cinereum 'lawrence flatman'
• How to propagate geranium cinereum 'lawrence flatman'
• Geranium cinereum 'Lawrence Flatman' growth rate & size
• Geranium cinereum 'Lawrence Flatman' cold hardiness
• Geranium cinereum 'Lawrence Flatman' temperature & humidity
• Is geranium cinereum 'lawrence flatman' toxic to cats & dogs?
• Is geranium cinereum 'lawrence flatman' toxic to cats?
• Is geranium cinereum 'lawrence flatman' toxic to dogs?
• Getting geranium cinereum 'lawrence flatman' to bloom

Featured in these plant shortlists

Geranium cinereum 'Lawrence Flatman' qualifies for 4 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.
• 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

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Geranium cinereum 'Lawrence Flatman' is also commonly called Lawrence Flatman cranesbill.

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