Pelargonium x asperum (Rough-leaved pelargonium) care

Light

Aim for at least 4-6 hours of direct sun on the leaves. Wants full sun for the strongest leaf fragrance and compact growth, with at least 4-6 hours of direct light. A sunny windowsill indoors; low light produces weak, sparsely scented foliage. If your only bright window faces south, that's perfect for pelargonium x asperum — same window any aroid would fry on.

Watering

Watering pelargonium x asperum: when the top 2-3 cm of soil is dry, about every 7-10 days. The number that matters isn't the day of the week — it's how dry the top 2-3 cm of the pot feels. A finger in the soil tells you more than a watering app. After every watering, tip the saucer. Water moderately, allowing the surface to dry between drinks; this scented geranium prefers to run slightly dry rather than soggy. Cut back in winter when growth slows. Overwatering causes yellowing and root rot.

Soil and pot

Pelargonium x asperum grows best in free-draining loam-based or general-purpose mix. A well-drained potting compost with added grit or perlite. It dislikes waterlogged roots, so ensure the pot drains freely and never let it sit in standing water. 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

Pelargonium x asperum sits happiest at around 30-50% humidity and 10-27°C (50-80°F). Happy in average, dryish household humidity with good ventilation. It is undemanding on moisture in the air; misting is unnecessary and can encourage fungal leaf problems. If you keep the room above 10 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 pelargonium x asperum sparingly. Feed every two to four weeks through spring and summer with a balanced or high-potassium liquid feed for steady foliage and flowering. Reduce or stop in winter. 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 pelargonium x asperum in the Growli community. Each is annotated with the most common cause so you know where to start.

• Weak fragrance and legginess — Sparse, poorly scented growth comes from too little sun. Give full light and pinch regularly to build a dense, aromatic bush.
• Yellowing leaves — Lower-leaf yellowing usually signals overwatering. Let the soil surface dry between waterings and ensure the pot drains freely.
• Rust and botrytis — Orange pustules or grey mould appear in damp, crowded conditions. Improve airflow, remove affected leaves and avoid overhead watering.
• Whitefly and aphids — Soft new growth attracts sap-sucking pests indoors. Inspect undersides of leaves and treat early with insecticidal soap.

Propagation

Very easy from softwood or semi-ripe stem cuttings spring through autumn; root in free-draining compost. Cuttings establish quickly and retain the rose scent. 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

Pelargonium x asperum is toxic to pets. Toxic to cats and dogs despite culinary use of its leaves. The ASPCA classifies Scented Geranium (Pelargonium sp.) as toxic, the toxic principle being essential oils (geraniol and linalool). Signs are primarily GI upset, with ataxia, muscle weakness, depression or hypothermia in larger exposures; cats are most sensitive. Keep away from 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.

Pelargonium x asperum deep-dive guides

Every aspect of pelargonium x asperum care, each with its own calibrated guide:

• Pelargonium x asperum watering schedule
• Pelargonium x asperum light requirements
• Best soil mix for pelargonium x asperum
• Pelargonium x asperum fertilizing guide
• When to repot pelargonium x asperum
• How to propagate pelargonium x asperum
• Pelargonium x asperum growth rate & size
• Pelargonium x asperum cold hardiness
• Pelargonium x asperum temperature & humidity
• Is pelargonium x asperum toxic to cats & dogs?
• Is pelargonium x asperum toxic to cats?
• Is pelargonium x asperum toxic to dogs?

Related guides

Pelargonium x asperum is also commonly called Rough-leaved pelargonium or Rose geranium hybrid.

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