Lily of the valley in Spain: cool shade and a toxicity warning

Lily of the valley, Convallaria majalis, is a spreading woodland perennial from cool temperate Europe and Asia, loved for the scent of its little white bells in spring. It is included here mainly to set expectations, because it is not well suited to a warm Costa Blanca garden.

Why it is a poor bet in the south east

The plant is adapted to a cool temperate seasonal cycle and wants consistently moist, humus-rich soil in shade. It tolerates acid, neutral or alkaline soil, but the hot coastal plain still gives it warm winters and a long dry summer. Plants may survive for a while as thin, non-flowering foliage before fading out.

Where it can succeed

In cooler Spanish gardens, at altitude or in the wetter north, lily of the valley can naturalise into a dense carpet in shade under shrubs and trees. If your garden genuinely has cold winters and moist shade, plant the rhizomes, known as pips, in autumn with the growing tips just below the surface, mulch with leaf mould and leave the colony undisturbed to spread.

Forcing pips for indoor scent

A mild-climate gardener can still enjoy the flowers by buying prepared pips in winter, potting them into a shallow container of moist compost and following the supplier's forcing instructions in a cool bright place. Treat them as a temporary display on the Costa Blanca. Forced pips may be planted out afterwards, but they still need a suitable cool garden climate to establish and flower again.

Toxicity

Lily of the valley is toxic if eaten and contains cardiac glycosides including convallatoxin. Swallowing plant material can cause digestive symptoms and dangerous changes in heart rhythm. Keep the plant and its red berries away from children and pets, wear gloves if handling causes irritation and do not use it in a home remedy. If ingestion is suspected, contact the Spanish toxicology information service or emergency care rather than waiting for symptoms.

Sources and review

This guide was reviewed in September 2026 using the Kew Plants of the World Online record for Convallaria majalis, the Royal Horticultural Society plant profile and clinical toxicology reviews describing the cardiac glycosides found in lily of the valley.