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Plant care

Dragon Heart Cranesbill (Dragon Heart Geranium) care

Geranium 'Dragon Heart'

Also called Dragon Heart Cranesbill, Dragon Heart Geranium.

RHS H7USDA 5-8Mildly toxic to petsIndoor Up to 50 cm tall and 80 cm wide.

Watering rhythm

Bright indirect light (just back from a sunny window)

Moderate; water during dry spells

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Light

Bright indirect light (just back from a sunny window)

Soil

Any moderately fertile, well-drained

Humidity

Low to moderate

Temp

-20°C to 30°C

Pet safety

Mildly toxic to pets

Mature size

Up to 50 cm tall and 80 cm wide.

Care at a glance

Light

Dragon Heart Cranesbill is what florists mean by "bright spot, no direct sun" — close enough to a south or east window to feel the brightness, with a sheer curtain or a few feet of distance keeping the sun off the leaves. Full sun or partial shade; shade is tolerated but best flower production and the most intense magenta colour are achieved in a bright, open border. A phone lux-meter at the leaf surface should read 1,500-3,000 lux at noon.

Watering

Water dragon heart cranesbill moderate; water during dry spells. 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 during extended dry periods to maintain vigorous growth and sustained flowering; this cultivar is fairly drought-tolerant once established in well-drained fertile soil.

Soil and pot

Dragon Heart Cranesbill grows best in any moderately fertile, well-drained. Grows in most garden soils apart from waterlogged sites; the spreading habit benefits from an organic mulch in spring to suppress weeds and retain moisture. 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

Dragon Heart Cranesbill sits happiest at around Low to moderate humidity and -20°C to 30°C (-4°F to 86°F). Average garden humidity suits this cultivar; the tall, arching stems benefit from open siting with good air movement to minimise powdery mildew risk. 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 dragon heart cranesbill sparingly. Apply a balanced slow-release fertiliser in spring; avoid excessive nitrogen which promotes leafy growth at the expense of the prolific flower display. 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 dragon heart cranesbill in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Flopping stems — Tall, trailing stems on vigorous plants can sprawl and smother lower-growing neighbours; insert twiggy pea-sticks or grow through an open-mesh hoop support placed in spring.
  • Geranium sawfly larvae — Greyish-green, spotted larvae create ragged holes in the foliage in late spring and again in late summer; check leaf undersides regularly and remove by hand to protect the display.

Propagation

Division of established clumps in spring; basal softwood cuttings in early spring with bottom heat. Protected by Plant Breeders' Rights — propagation for sale requires a licence. 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

Dragon Heart Cranesbill is mildly toxic to pets. The ASPCA 'Geranium' toxic listing refers to Pelargonium species (containing geraniol and linalool), not to true Geranium cranesbills. True Geranium is not individually listed as toxic or confirmed non-toxic by ASPCA; treat with caution around pets. 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.

Dragon Heart Cranesbill care — frequently asked questions

What is the common name for Geranium 'Dragon Heart'?

Geranium 'Dragon Heart' is most commonly called Dragon Heart Cranesbill, but it is also known as Dragon Heart Cranesbill, Dragon Heart Geranium. The names refer to the same species, so care instructions for Dragon Heart Cranesbill apply identically to anything sold as Dragon Heart Geranium.

How much light does dragon heart cranesbill need?

Dragon Heart Cranesbill grows best in bright indirect light (just back from a sunny window). Full sun or partial shade; shade is tolerated but best flower production and the most intense magenta colour are achieved in a bright, open border.

How often should I water dragon heart cranesbill?

Water dragon heart cranesbill moderate; water during dry spells. Water during extended dry periods to maintain vigorous growth and sustained flowering; this cultivar is fairly drought-tolerant once established in well-drained fertile soil. The finger-test (or lifting the pot to feel its weight) beats a fixed weekly calendar because pot size, light, and season all change how fast the soil dries.

Is dragon heart cranesbill toxic to cats and dogs?

Dragon Heart Cranesbill is mildly toxic to pets. The ASPCA 'Geranium' toxic listing refers to Pelargonium species (containing geraniol and linalool), not to true Geranium cranesbills. True Geranium is not individually listed as toxic or confirmed non-toxic by ASPCA; treat with caution around pets.

What USDA hardiness zone does dragon heart cranesbill grow in?

Dragon Heart Cranesbill is rated for USDA zone 5-8 and RHS hardiness H7. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Dragon Heart Cranesbill deep-dive guides

Every aspect of dragon heart cranesbill care, each with its own calibrated guide:

Featured in these plant shortlists

Dragon Heart Cranesbill qualifies for 5 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Dragon Heart Cranesbill is also commonly called Dragon Heart Cranesbill or Dragon Heart Geranium.