Pulmonaria officinalis: grow variegated leaves in shade

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Pulmonaria officinalis, commonly known as lungwort, is a charming woodland perennial prized for its speckled, silver-mottled foliage and delicate early spring flowers that shift from pink to blue. It thrives in shaded borders and beneath deciduous trees, providing essential nectar for bees and hoverflies when little else is flowering. Its distinctive spotted leaves persist throughout the year, offering ornamental interest long after the blooms fade.

Growing conditions

Lungwort performs best in partial to full shade, making it an ideal choice for north-facing borders, woodland gardens, and the dappled light beneath trees. Direct afternoon sun can scorch the leaves, particularly in warm summers, so avoid south-facing positions in hotter regions. A site with morning shade and afternoon shelter is ideal.

This plant favours moist, humus-rich soil that drains well and does not become waterlogged. It tolerates a wide pH range but prefers slightly acidic to neutral conditions; chalk soils are acceptable provided organic matter is worked in generously. Avoid compacted clay or sandy soils lacking organic content, as these stress the plant.

Lungwort is fully hardy across the British Isles and much of northern Europe, thriving in USDA zones 4–9. It tolerates cold winters with ease and requires no special protection, though it may slow its growth in very dry or exceptionally hot summers.

How to plant Pulmonaria

Plant in autumn or early spring when the soil is moist and the plant can establish roots before summer. Spring planting is preferable in heavy clay soils where autumn waterlogging may cause rot.

• Space plants 45–60 cm apart to allow for mature spread without crowding neighbouring plants
• Plant with the crown level with the soil surface; burying it invites rot, whilst planting too high exposes roots
• Incorporate 5–7 cm of compost or leaf mould into the planting hole to improve drainage and add humus
• Water thoroughly after planting and keep the soil moist for the first four weeks
• Divide established clumps every three to four years in autumn or early spring to rejuvenate growth

Care through the seasons

Spring: Feed with a balanced, granular fertiliser in late February as new growth emerges. Deadhead spent flower clusters to encourage a tidier appearance, though leaving some flowers encourages self-seeding. Remove any winter-damaged or yellowed outer leaves to reveal fresh, variegated foliage beneath.

Summer: Water deeply during dry spells to maintain consistently moist soil; lungwort is a woodland plant and dislikes drought stress. Mulch around the base with 5 cm of leaf mould or compost in June to cool the roots and suppress weeds. If the plant spreads vigorously, gently pull away excess rosettes at the margins to control its footprint.

Autumn: Cut back flowering stems once they have finished in June, reducing height by half. In September or October, divide congested clumps by digging up the entire plant, teasing the roots apart, and replanting vigorous outer sections. Apply a 7–10 cm mulch of leaf mould around the plant to protect the crown during winter and enrich the soil.

Winter: Lungwort is deciduous in very cold regions but often retains some foliage in milder areas. No winter protection is necessary; the plant lies dormant and requires no supplemental watering unless the soil dries out entirely.

Best varieties to grow

Several outstanding cultivars extend the colour range and improve disease resistance beyond the species type.

• Pulmonaria officinalis ‘Sissinghurst White’ — Pure white flowers on compact plants with heavily silvered leaves; an outstanding cultivar for brightening shaded corners.
• Pulmonaria officinalis ‘White Wings’ — White blooms with subtle red calyces and intense white variegation on long, narrow leaves; particularly ornamental.
• Pulmonaria officinalis ‘Cambridge Blue’ — Compact form with clear blue flowers and distinctly spotted foliage; reliable and disease-resistant.
• Pulmonaria officinalis ‘Bertram Anderson’ — Vibrant deep-blue flowers and exceptionally bright silver mottling; vigorous and long-flowering (April to June).

Pests, diseases and common problems

• Powdery mildew: Whitish coating on leaf surfaces, particularly in warm, dry conditions with poor air circulation. Improve ventilation by thinning congested foliage, avoid overhead watering, and apply a sulphur-based fungicide if necessary.
• Rust: Rusty or orange pustules on leaf undersides, worsening in wet summers. Remove affected leaves promptly and dispose of them in household waste (not compost). Improve drainage and avoid watering foliage in the evening.
• Root rot: Stems wilt and blacken at the base despite moist soil, caused by waterlogging or heavy clay. Improve drainage by amending soil with compost and grit; replant crowns slightly proud of soil level if rot has begun.
• Slugs and snails: Holes and slime trails on young spring foliage and emerging flowers. Hand-pick after rain, introduce ground beetles by leaving leaf litter, or use copper tape barriers around vulnerable plants.