One-flowered Clintonia (Queen's Cup) care

Light

One-flowered Clintonia is a useful plant for the room nobody else likes — the north-facing hallway, the basement office, the windowless bathroom with the ceiling LED. Requires full to deep shade; its natural habitat is the floor of dense coniferous forest. Direct sun causes rapid leaf scorch and plant collapse. Filtered light through a high canopy is the maximum tolerable exposure. Expect slow growth and pale new leaves; that's the cost of low light, not a sign anything is wrong.

Watering

Aim for maintain consistently moist soil; water deeply when the top 2 cm begins to dry for one-flowered clintonia, but treat that as a starting point rather than a rule. A south-facing summer windowsill will dry the pot twice as fast as a north-facing winter room. Lift the pot; if it feels noticeably lighter than it did wet, water it. Needs reliably moist soil throughout the growing season, particularly through spring and early summer. Mulch with leaf mold to retain moisture. Tolerates temporary dry spells once established but declines without steady moisture.

Soil and pot

One-flowered Clintonia grows best in moist, acidic, humus-rich forest loam. Strongly acidic pH preferred (4.5–6.0), matching its native forest floor habitat. Incorporate generous quantities of leaf mold or composted bark. Good drainage beneath the humus layer is important to prevent crown rot. 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

One-flowered Clintonia sits happiest at around Moderate to high (55–80%) humidity and 1–22°C (34–72°F). Native to the cool, humid air of montane conifer forests. In cultivation, group with other woodland perennials and mulch thickly to maintain microclimate humidity. If you keep the room above 1–22°C 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 one-flowered clintonia sparingly. Annual top-dressing with leaf mold in autumn is usually sufficient. A light spring application of acidic slow-release fertilizer can support plants in non-native garden soils. 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 one-flowered clintonia in the Growli community. Each is annotated with the most common cause so you know where to start.

• Failure to thrive in warm or alkaline conditions — This cool montane species performs poorly in warm, low-elevation gardens or alkaline soils. Replicate its native habitat as closely as possible with acidic, moist, cool conditions.
• Slow establishment from division — Rhizomes are fragile and plants establish slowly. Minimize root disturbance and keep newly planted divisions consistently moist and in deep shade for the first season.
• Slug and snail predation — Slugs target the broad, glossy leaves in spring. Use iron phosphate bait and check under mulch regularly in cool, wet conditions.

Propagation

Divide rhizomes carefully in early spring; each section must have viable roots and a growing point. Seed is best sown fresh in autumn in a cold frame with acidic seed compost; seedlings require cold stratification and take up to 4 years to flower. Division is the more reliable method. 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

One-flowered Clintonia is mildly toxic to pets. Clintonia uniflora is not individually listed by the ASPCA. The single blue berry is generally regarded as inedible and potentially mildly toxic; indigenous accounts and botanical sources treat it with caution. The closely related C. borealis is ASPCA non-toxic, but C. uniflora has no specific safety classification — treat the berries as potentially harmful to pets and children pending formal evaluation. 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.

One-flowered Clintonia deep-dive guides

Every aspect of one-flowered clintonia care, each with its own calibrated guide:

• Common one-flowered clintonia problems & fixes
• One-flowered Clintonia watering schedule
• One-flowered Clintonia light requirements
• Best soil mix for one-flowered clintonia
• One-flowered Clintonia fertilizing guide
• When to repot one-flowered clintonia
• How to propagate one-flowered clintonia
• How to prune one-flowered clintonia
• What's eating my one-flowered clintonia?
• One-flowered Clintonia growth rate & size
• One-flowered Clintonia cold hardiness
• One-flowered Clintonia temperature & humidity
• Is one-flowered clintonia toxic to cats & dogs?
• Is one-flowered clintonia toxic to cats?
• Is one-flowered clintonia toxic to dogs?
• Getting one-flowered clintonia to bloom

Featured in these plant shortlists

One-flowered Clintonia 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 humidity-loving houseplants — Houseplants that thrive in a bathroom, kitchen, or by a humidifier — selected by documented humidity preference.
• Best bathroom plants — Humidity-loving houseplants that also cope with lower light — suited to the steamy, often-dim conditions of a typical bathroom.
• 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 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

One-flowered Clintonia is also known as One-flowered Clintonia, Queen's Cup, Bride's Bonnet, and Bead Lily.

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