Glandular Heron's Bill (Black-Eyed Heron's Bill) care

Light

Glandular Heron's Bill needs sun on the leaves, not just bright ambient room light. Requires full sun for at least six hours a day; insufficient light results in loose, lax growth and reduced flowering. 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 glandular heron's bill water sparingly; allow soil to dry almost completely between waterings. 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. Very drought-tolerant once established; water modestly during summer and reduce to near-zero in winter to prevent crown rot in wet conditions.

Soil and pot

Glandular Heron's Bill grows best in gritty, sharply-drained, neutral to alkaline. Use a lean alpine mix — roughly equal parts loam, coarse grit, and pea gravel; avoid any moisture-retentive compost-rich blend. 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

Glandular Heron's Bill sits happiest at around Low (30–50%) humidity and -15 to 25°C (5 to 77°F). Prefers dry air; high ambient humidity combined with cool temperatures and damp soil is the primary driver of fungal crown rot. 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 glandular heron's bill sparingly. Apply a low-nitrogen, high-potassium fertiliser (e.g. 5-10-10) at half strength once in early spring; avoid rich feeding, which produces soft growth prone to rot. 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 glandular heron's bill in the Growli community. Each is annotated with the most common cause so you know where to start.

• Crown rot — The most common killer; caused by waterlogged soil or poor air circulation in winter wet. Prevent by planting in raised beds or adding a collar of grit around the crown.
• Vine weevil larvae — Grubs feed on roots, causing sudden wilt; inspect roots when repotting and treat with nematodes (Steinernema kraussei) in early autumn.

Propagation

Sow seed in a cold frame as soon as ripe in late summer; divide established clumps in spring; take basal stem cuttings in late spring to early summer and root in gritty compost. 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

Glandular Heron's Bill is mildly toxic to pets. Erodium glandulosum is not listed on the ASPCA Toxic and Non-Toxic Plant database as a toxic species, and no specific toxic principles have been documented for this species. However, as ASPCA data for this exact species is absent, it is prudent to classify it as mildly-toxic; ingestion of plant material may cause mild gastrointestinal upset in cats or dogs. Consult a vet if significant ingestion occurs. 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.

Glandular Heron's Bill deep-dive guides

Every aspect of glandular heron's bill care, each with its own calibrated guide:

• Common glandular heron's bill problems & fixes
• Glandular Heron's Bill watering schedule
• Glandular Heron's Bill light requirements
• Best soil mix for glandular heron's bill
• Glandular Heron's Bill fertilizing guide
• When to repot glandular heron's bill
• How to propagate glandular heron's bill
• How to prune glandular heron's bill
• What's eating my glandular heron's bill?
• Glandular Heron's Bill growth rate & size
• Glandular Heron's Bill cold hardiness
• Glandular Heron's Bill temperature & humidity
• Is glandular heron's bill toxic to cats & dogs?
• Is glandular heron's bill toxic to cats?
• Is glandular heron's bill toxic to dogs?
• All 14 Erodium varieties
• Getting glandular heron's bill to bloom

Featured in these plant shortlists

Glandular Heron's Bill qualifies for 5 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• 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 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

Related guides

Glandular Heron's Bill is also known as Glandular Heron's Bill, Black-Eyed Heron's Bill, and Glandular Stork's Bill.

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