Lungwort Pulmonaria (common lungwort) care

Light

If you have a corner where every other plant turned leggy and died, try lungwort pulmonaria. A true shade plant: full to part shade suits it best, ideal under deciduous trees and shrubs. Too much sun, especially with dry soil, causes wilting and leaf scorch; deep shade is tolerated. The catch: when a low-light plant does fail, it's almost always because someone watered it on the same schedule as their brighter plants. Less light = less water, every time.

Watering

Watering lungwort pulmonaria: keep soil evenly moist; water every 4-6 days in dry spells, more in containers. 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. Prefers steadily damp ground and resents drought, which triggers wilting and mildew. Mulch with leaf mould to retain moisture. Established clumps in cool shade are fairly forgiving once settled.

Soil and pot

Lungwort Pulmonaria grows best in moist, humus-rich, well-drained loam. Wants fertile, organic-rich woodland soil that stays moist but not waterlogged. Neutral to slightly alkaline pH is fine. Enrich with leaf mould or compost; avoid hot, dry, free-draining spots. 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

Lungwort Pulmonaria sits happiest at around Ambient outdoor humidity humidity and -30 to 24°C (-22 to 75°F). A hardy outdoor perennial needing no special humidity. It naturally favours the cool, moist microclimate of shaded borders and woodland edges. 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 lungwort pulmonaria sparingly. Undemanding; an annual spring mulch of leaf mould or compost usually suffices. On poor soils, a light balanced feed in spring supports leaf and flower vigour. Avoid overfeeding, which produces lush, mildew-prone 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 lungwort pulmonaria in the Growli community. Each is annotated with the most common cause so you know where to start.

• Powdery mildew — Very common in dry shade after flowering, coating leaves white. Keep soil moist, cut back tired foliage to force fresh growth, and improve airflow.
• Wilting and leaf scorch — Signals soil too dry or light too bright. Water, mulch, and relocate to deeper shade with moisture-retentive soil if recurring.
• Tired post-flowering foliage — Leaves often look ragged after bloom. Shear the whole clump back; a flush of clean, well-marked new leaves follows.
• Slug and snail damage — Soft new spring growth can be grazed. Use barriers or wildlife-safe controls around emerging crowns in damp shade.

Propagation

Divide congested clumps after flowering or in autumn, replanting healthy sections in enriched, moist soil. Self-sown seedlings appear but vary; species plants can come reasonably true from 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

Lungwort Pulmonaria is mildly toxic to pets. Not individually listed by the ASPCA, so its pet status is unconfirmed; it contains pyrrolizidine alkaloids and saponins (compound classes the ASPCA flags as toxic) and bristly trichomes can irritate skin. Treat with caution and verify with a vet — do not assume 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.

Lungwort Pulmonaria deep-dive guides

Every aspect of lungwort pulmonaria care, each with its own calibrated guide:

• Lungwort Pulmonaria watering schedule
• Lungwort Pulmonaria light requirements
• Best soil mix for lungwort pulmonaria
• Lungwort Pulmonaria fertilizing guide
• When to repot lungwort pulmonaria
• How to propagate lungwort pulmonaria
• Lungwort Pulmonaria growth rate & size
• Lungwort Pulmonaria cold hardiness
• Lungwort Pulmonaria temperature & humidity
• Is lungwort pulmonaria toxic to cats & dogs?
• Is lungwort pulmonaria toxic to cats?
• Is lungwort pulmonaria toxic to dogs?
• Getting lungwort pulmonaria to bloom

Featured in these plant shortlists

Lungwort Pulmonaria qualifies for 5 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 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

Lungwort Pulmonaria is also known as common lungwort, spotted lungwort, and Jerusalem cowslip.

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