Sickle-leaved Hare's-ear (Sickle Hare's Ear) care

Light

Sickle-leaved Hare's-ear needs sun on the leaves, not just bright ambient room light. Requires full sun to thrive; grows naturally on open, south-facing limestone slopes and dry banks with little or no shade. 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 sickle-leaved hare's-ear every 10–14 days, allowing soil to dry 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. Drought-tolerant once established and does not tolerate waterlogged soil; water moderately during the first growing season to aid establishment, then rely mainly on rainfall.

Soil and pot

Sickle-leaved Hare's-ear grows best in well-drained, calcareous, poor to moderately fertile. Prefers limestone or chalk-based, stony or sandy soil; also performs well in ordinary well-drained garden soil. Avoid heavy clay or rich, wet ground. 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

Sickle-leaved Hare's-ear sits happiest at around Low to moderate humidity and -15 to 28°C (5 to 82°F). Adapted to open, dry, continental-influenced conditions; tolerates low ambient humidity and dislikes persistently damp air or waterlogged roots. 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 sickle-leaved hare's-ear sparingly. Apply a light balanced feed in spring if soil is particularly poor; avoid high-nitrogen fertilisers, which cause lax, floppy growth and reduce drought tolerance. 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 sickle-leaved hare's-ear in the Growli community. Each is annotated with the most common cause so you know where to start.

• Crown rot from waterlogging — The primary cause of plant death in cultivation; always grow in sharply drained soil or raise beds with added grit. Avoid poorly drained clay soils entirely.
• Self-seeding aggressively — Can self-sow prolifically in suitable dry, open conditions; deadhead spent flower heads before seed sets if unwanted spread is a concern.

Propagation

Sow seed in spring or autumn in a cold frame; the plant also self-seeds freely in well-drained, open positions. Division of established plants in spring is possible but the tap-rooted nature makes it less reliable than seed. 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

Sickle-leaved Hare's-ear is mildly toxic to pets. Bupleurum falcatum is not individually listed on the ASPCA Toxic and Non-Toxic Plant database. While Cats Protection notes it as generally safe, the Apiaceae family contains toxic members and individual species toxicity data is limited. Classified as mildly-toxic as a precaution; consult a vet if a pet ingests any part of the plant. 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.

Sickle-leaved Hare's-ear deep-dive guides

Every aspect of sickle-leaved hare's-ear care, each with its own calibrated guide:

• Common sickle-leaved hare's-ear problems & fixes
• Sickle-leaved Hare's-ear watering schedule
• Sickle-leaved Hare's-ear light requirements
• Best soil mix for sickle-leaved hare's-ear
• Sickle-leaved Hare's-ear fertilizing guide
• When to repot sickle-leaved hare's-ear
• How to propagate sickle-leaved hare's-ear
• How to prune sickle-leaved hare's-ear
• What's eating my sickle-leaved hare's-ear?
• Sickle-leaved Hare's-ear growth rate & size
• Sickle-leaved Hare's-ear cold hardiness
• Sickle-leaved Hare's-ear temperature & humidity
• Is sickle-leaved hare's-ear toxic to cats & dogs?
• Is sickle-leaved hare's-ear toxic to cats?
• Is sickle-leaved hare's-ear toxic to dogs?
• Getting sickle-leaved hare's-ear to bloom

Featured in these plant shortlists

Sickle-leaved Hare's-ear qualifies for 4 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 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

Sickle-leaved Hare's-ear is also known as Sickle-leaved Hare's-ear, Sickle Hare's Ear, and Falcate Thorow-wax.

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