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Plant care

Caucasian Lily (Szovits Lily) care

Lilium monadelphum

Also called Caucasian Lily, Szovits Lily, Yellow Caucasian Lily.

RHS H6USDA 4-8Toxic to petsIndoor 100–180 cm tall (3.3–6 ft)

Watering rhythm

Bright indirect light (just back from a sunny window)

Moderate — keep soil consistently moist but not waterlogged

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Light

Bright indirect light (just back from a sunny window)

Soil

Humus-rich, moisture-retentive, well-drained loam or clay loam

Humidity

Moderate to high — 50–70%

Temp

-25°C to 28°C; optimal 12–22°C during growth

Pet safety

Toxic to pets

Mature size

100–180 cm tall (3.3–6 ft)

Care at a glance

Light

Bright but filtered. Caucasian Lily burns within days in unfiltered south-facing summer sun, and stops growing within months in deep shade. Tolerates dappled shade to partial shade better than almost any other Lilium species, making it excellent for light woodland or the shaded side of shrub borders. Prefers bright indirect light or morning sun with afternoon shade in the UK; tolerates full sun if roots are kept cool and moist with a deep mulch. If you only have a south window, set the plant back 1.5 m or hang a sheer curtain — both knock the intensity down into the right range.

Watering

Watering caucasian lily: moderate — keep soil consistently moist but not waterlogged. 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 regularly during the growing season to maintain consistent moisture, particularly important in drier soils. As a subalpine meadow plant it enjoys moderate consistent moisture and is more drought-sensitive during flowering than many other garden lilies. Apply a deep organic mulch to retain soil moisture and keep bulbs cool.

Soil and pot

Caucasian Lily grows best in humus-rich, moisture-retentive, well-drained loam or clay loam. Remarkably tolerant of alkaline and clay soils compared to most lilies — pH 6.0–8.0 is acceptable. Incorporates generous amounts of leaf mould or well-rotted compost to improve both moisture retention and structure. Avoid waterlogging. A deep mulch layer is beneficial year-round. 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

Caucasian Lily sits happiest at around Moderate to high — 50–70% humidity and -25°C to 28°C; optimal 12–22°C during growth (-13°F to 82°F; optimal 54–72°F during growth). As a mountain meadow and forest-edge plant, it is accustomed to relatively cool, moderately humid conditions. Tolerates the typical humidity of UK temperate gardens well. As always with lilies, good air circulation through the planting reduces the risk of Botrytis in wet summers. 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 caucasian lily sparingly. Apply a balanced, slow-release bulb fertiliser in early spring as stems emerge. Supplement with a high-potassium liquid feed fortnightly from bud formation until flowering ends, to rebuild the bulb's energy reserves. Avoid high-nitrogen fertilisers which produce excessive, disease-prone leafy 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 caucasian lily in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Lily beetle (Lilioceris lilii) — Scarlet adults and their excrement-camouflaged larvae consume foliage and buds at high speed. Inspect plants from April onwards; hand-pick adults and larvae daily. Apply pyrethrum sprays in the evening if populations are high. The tall, robust stems of this species support a large leaf canopy that attracts heavy infestations.
  • Botrytis elliptica in wet conditions — Grey mould causes water-soaked brown leaf spots that spread rapidly in cool, wet summers — a particular risk in UK climates. Improve air circulation by not overcrowding plants; remove infected foliage promptly; apply copper-based or mancozeb fungicide preventively from stem emergence in wetter regions.
  • Slow establishment after planting — Lilium monadelphum, like L. martagon, may produce only modest displays in the first 1–2 years as the bulb adjusts to its new site. Plant bulbs at three times their depth in autumn in well-prepared soil and leave them undisturbed — moving established clumps causes significant setback.

Propagation

Propagate by bulb scaling in late summer: carefully remove healthy outer scales, dust with a fungicide powder, and nest them in barely moist vermiculite at 18–20°C for 8–12 weeks until bulbils form. Pot bulbils on and grow in a cold frame for 2–3 seasons before planting out. Seed can be sown fresh in autumn; it requires a lengthy warm-then-cold stratification cycle and takes 4–6 years to reach flowering size. Established clumps can be divided carefully in autumn, though this species resents disturbance. 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

Caucasian Lily is toxic to pets. As a true Lilium species, Lilium monadelphum is severely toxic to cats (ASPCA confirmed, genus Lilium). All parts of the plant — including leaves, petals, pollen, stem, and water from cut stems in a vase — can cause acute renal failure in cats, frequently fatal within 24–72 hours unless treated as an emergency. Even small pollen quantities groomed from fur are lethal to cats. Also harmful to dogs and horses in significant quantities. This lily must never be grown where cats can access it. 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.

Caucasian Lily care — frequently asked questions

What is the common name for Lilium monadelphum?

Lilium monadelphum is most commonly called Caucasian Lily, but it is also known as Caucasian Lily, Szovits Lily, Yellow Caucasian Lily. The names refer to the same species, so care instructions for Caucasian Lily apply identically to anything sold as Szovits Lily.

How much light does caucasian lily need?

Caucasian Lily grows best in bright indirect light (just back from a sunny window). Tolerates dappled shade to partial shade better than almost any other Lilium species, making it excellent for light woodland or the shaded side of shrub borders. Prefers bright indirect light or morning sun with afternoon shade in the UK; tolerates full sun if roots are kept cool and moist with a deep mulch.

How often should I water caucasian lily?

Water caucasian lily moderate — keep soil consistently moist but not waterlogged. Water regularly during the growing season to maintain consistent moisture, particularly important in drier soils. As a subalpine meadow plant it enjoys moderate consistent moisture and is more drought-sensitive during flowering than many other garden lilies. Apply a deep organic mulch to retain soil moisture and keep bulbs cool. The finger-test (or lifting the pot to feel its weight) beats a fixed weekly calendar because pot size, light, and season all change how fast the soil dries.

Is caucasian lily toxic to cats and dogs?

Caucasian Lily is toxic to pets. As a true Lilium species, Lilium monadelphum is severely toxic to cats (ASPCA confirmed, genus Lilium). All parts of the plant — including leaves, petals, pollen, stem, and water from cut stems in a vase — can cause acute renal failure in cats, frequently fatal within 24–72 hours unless treated as an emergency. Even small pollen quantities groomed from fur are lethal to cats. Also harmful to dogs and horses in significant quantities. This lily must never be grown where cats can access it.

What USDA hardiness zone does caucasian lily grow in?

Caucasian Lily is rated for USDA zone 4-8 and RHS hardiness H6. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Caucasian Lily deep-dive guides

Every aspect of caucasian lily care, each with its own calibrated guide:

Featured in these plant shortlists

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

Related guides

Caucasian Lily is also known as Caucasian Lily, Szovits Lily, and Yellow Caucasian Lily.