Broad-Petalled Cranesbill (Broad-Petalled Geranium) care

Light

In the wild broad-petalled cranesbill grows on the bright edge of a forest canopy, not in the canopy and not in the open. Indoors, that translates to within a metre of an unobstructed window, sheer curtain optional. Best in full sun to partial shade; at least four hours of direct sun daily encourages the most prolific flowering. The fastest test: a hand held at the leaf casts a soft-edged shadow at noon — sharp shadow means too much sun, no shadow means too little light.

Watering

Aim for once or twice a week in the growing season; less in winter for broad-petalled cranesbill, 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. Water freely during dry spells in spring and summer; once established, plants tolerate short periods of drought but flag quickly in prolonged heat without moisture.

Soil and pot

Broad-Petalled Cranesbill grows best in moderately fertile, well-drained loam or sandy loam. Tolerates most garden soils except waterlogged conditions; improve heavy clay with grit or coarse compost before planting. 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

Broad-Petalled Cranesbill sits happiest at around Ambient outdoor humidity (40–70%) humidity and -20 to 25°C (-4 to 77°F). This outdoor perennial requires no supplemental humidity and is comfortable in typical temperate garden conditions in the UK and northern US. 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 broad-petalled cranesbill sparingly. Apply a balanced slow-release granular fertiliser in early spring; avoid high-nitrogen feeds that promote leafy growth at the expense of flowers. 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 broad-petalled cranesbill in the Growli community. Each is annotated with the most common cause so you know where to start.

• Powdery mildew — Grey-white coating on leaves appears in hot, dry summers with poor air circulation; improve spacing, water at the base rather than overhead, and remove affected foliage promptly.
• Vine weevil — C-shaped grubs feed on roots in late summer to autumn, causing plants to wilt and collapse; treat container-grown plants with nematodes (Steinernema kraussei) from August to October when soil temperature is above 5°C.

Propagation

Divide established clumps in early spring or autumn; replant divisions immediately with good moisture. Can also be raised from seed sown under glass in early spring, though germination is slow and seedlings variable. 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

Broad-Petalled Cranesbill is pet-safe. True Geranium species (cranesbills) are listed by the ASPCA as non-toxic to cats and dogs, in contrast to Pelargonium (florist's geranium), which is mildly toxic. 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.

Broad-Petalled Cranesbill deep-dive guides

Every aspect of broad-petalled cranesbill care, each with its own calibrated guide:

• Common broad-petalled cranesbill problems & fixes
• Broad-Petalled Cranesbill watering schedule
• Broad-Petalled Cranesbill light requirements
• Best soil mix for broad-petalled cranesbill
• Broad-Petalled Cranesbill fertilizing guide
• When to repot broad-petalled cranesbill
• How to propagate broad-petalled cranesbill
• How to prune broad-petalled cranesbill
• What's eating my broad-petalled cranesbill?
• Broad-Petalled Cranesbill growth rate & size
• Broad-Petalled Cranesbill cold hardiness
• Broad-Petalled Cranesbill temperature & humidity
• Is broad-petalled cranesbill toxic to cats & dogs?
• Is broad-petalled cranesbill toxic to cats?
• Is broad-petalled cranesbill toxic to dogs?
• All 78 Geranium varieties
• Getting broad-petalled cranesbill to bloom

Featured in these plant shortlists

Broad-Petalled Cranesbill qualifies for 10 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best pet-safe houseplants — Houseplants the ASPCA lists as non-toxic to cats and dogs — every one verified against the ASPCA toxic and non-toxic plant list.
• Best plants for a north-facing window — Houseplants for a north-facing window: bright, even, indirect light and no scorching direct sun. Each pick verified against its documented light needs.
• Best drought-tolerant houseplants — Houseplants that prefer to dry out — forgiving of forgotten watering and ideal for travel or busy weeks.
• Best flowering houseplants — Indoor plants grown for their blooms — selected from the flowering species in Growli’s plant-care library.
• Best pet-safe low-maintenance plants — Non-toxic to cats and dogs and forgiving of forgotten watering — the easiest safe choices for a busy pet household.
• Best pet-safe flowering plants — Flowering houseplants the ASPCA lists as non-toxic to cats and dogs — colour and blooms in a pet home, without the worry.
• Best pet-safe plants for bright light — Non-toxic to cats and dogs and happy in a bright, sunny spot — safe plants for your best-lit windowsill.
• 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.
• Best cat-safe plants — Houseplants the ASPCA lists as non-toxic to cats (and dogs) — safe greenery for a home with a curious cat.
• Best dog-safe plants — Houseplants the ASPCA lists as non-toxic to dogs (and cats) — safe greenery for a home with a curious dog.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Broad-Petalled Cranesbill is also known as Broad-Petalled Cranesbill, Broad-Petalled Geranium, and Hardy Cranesbill.

• Two-leaf Squill care — light, water and common problems
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• Common Snowdrop care — light, water and common problems
• All 10153 plant care guides in the Growli library