Geranium sylvaticum 'Mayflower' (Mayflower wood cranesbill) care

Light

Geranium sylvaticum 'Mayflower' wants the spot a few feet back from a sunny window — bright enough to read a paperback at noon, but the sun never falls directly on the leaves. Best in part shade to dappled light, tolerating full sun where soil stays moist. Inherits the woodland-edge preferences of the species; avoid hot, parched positions that fade the flower colour. A faint hand shadow at midday is the right amount; a sharp dark shadow means it's getting direct sun and probably too much.

Watering

Water geranium sylvaticum 'mayflower' keep evenly moist; water deeply when the top 3-4 cm dries, about weekly through the growing season. 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. Likes reliably moist soil and resents drought during flowering. Mulch to conserve moisture; established plants in good ground need watering only in dry spells.

Soil and pot

Geranium sylvaticum 'Mayflower' grows best in fertile, humus-rich, moisture-retentive loam. Thrives in any moisture-holding garden soil improved with leaf mould or compost. Tolerant of neutral to mildly alkaline or acid conditions; dislikes hot, free-draining, dry soils. 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 sylvaticum 'Mayflower' sits happiest at around Outdoor ambient humidity and -30 to 24°C (-22 to 75°F). Fully hardy outdoor perennial with no special humidity needs; well suited to cool, moist temperate climates including the UK. 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 sylvaticum 'mayflower' sparingly. Low feeder. A spring mulch of compost or leaf mould generally meets its needs; one application of balanced general fertiliser in spring is plenty on lean soils. Over-feeding produces lush but floppy, shy-flowering growth. 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 sylvaticum 'mayflower' in the Growli community. Each is annotated with the most common cause so you know where to start.

• Powdery mildew — Greyish-white film on foliage in dry late-summer conditions. Shear affected leaves back hard and keep soil moist to trigger clean regrowth.
• Faded flower colour — Violet-blue blooms wash out pale in hot, dry sun. Site in part shade with moist soil to keep the colour rich and the display longer.
• Post-bloom flop — Clump sprawls and tires after the early-summer flush. Cut back by half to two-thirds to regenerate a fresh, compact mound of leaves.
• Vine weevil in pots — Notched leaves and wilting from root-eating grubs in containers. Use nematode treatments or grow in open ground where attacks are uncommon.

Propagation

Propagate by division in autumn or early spring to keep the named clone true; basal cuttings in spring root well. As a selected cultivar it will not come true from seed, so avoid seed-raising if you want identical plants. 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 sylvaticum 'Mayflower' is mildly toxic to pets. Hardy cranesbills in the true Geranium genus are not individually listed on the ASPCA toxic plant database; the ASPCA 'Geranium' listing refers to Pelargonium (bedding geranium), which is toxic via geraniol and linalool. Cranesbills are generally considered non-toxic, but as 'Mayflower' is not specifically ASPCA-listed, treat with caution and verify with a vet rather than assuming pet-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 sylvaticum 'Mayflower' deep-dive guides

Every aspect of geranium sylvaticum 'mayflower' care, each with its own calibrated guide:

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

Featured in these plant shortlists

Geranium sylvaticum 'Mayflower' qualifies for 6 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best low-light houseplants — Houseplants that need no direct sun and cope with a north-facing room or a spot well back from a window.
• 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 houseplants for beginners — Forgiving of irregular light and watering — the houseplants least likely to die in a new plant parent’s first season.
• Best flowering houseplants — Indoor plants grown for their blooms — selected from the flowering species in Growli’s plant-care library.
• 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

Geranium sylvaticum 'Mayflower' is also commonly called Mayflower wood cranesbill.

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