No. 03 · October 2026

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Flora & Field

Lily-of-the-Valley

Convallaria majalis

Identify lily-of-the-valley, plant its rhizomes at the sourced depth, contain its spreading colony, and handle every poisonous part safely.

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At a glance

Light
Partial to full shade
Water
Evenly moist while in active growth
Soil
Humus-rich, moisture-retentive, well-drained soil
Hardiness
Zones 3–7
Bloom
Mid- to late spring
Height
6–10 in · 15–25 cm
Botanical identification plate of Lily-of-the-Valley, Convallaria majalis
The identification plate isolates the complete habit and the leaves, stems, flowers, or fertile parts used to recognize Lily-of-the-Valley.View full plate
In this guide

Overview

Lily-of-the-valley is a deciduous rhizomatous groundcover, not a bulb lily. Each shoot usually carries two or three broad, parallel-veined leaves around a one-sided raceme of fragrant white bells. Red berries form only sometimes, but both the berries and the less conspicuous underground rhizomes belong to the same poisonous plant.

Individual shoots stand about 6–10 in tall, while underground rhizomes can extend a colony indefinitely beyond its first 1–2 ft patch. Use it only where that spread is acceptable and physically manageable. A contained shade bed or an area bounded by paving is safer than a mixed woodland collection whose roots cannot be separated later.

Dappled, partial, or full shade and fertile humus-rich soil support the best foliage and bloom. Keep the soil moist during spring growth, but established colonies tolerate some summer dryness. Hot, humid climates can cause early foliage decline even when watering is adequate, so regional suitability matters more than forcing the plant with extra irrigation.

NC State specifies planting with the base of the rhizome about 3 in below the surface. Spread the roots, position the growing point upright, and water the soil closed around it. Mark the planted boundary immediately because foliage will die down and the underground colony will otherwise be easy to disturb or overlook.

Rhizomes may grow slowly at first and then form a dense mat in favorable cool, moist conditions. Inspect the outer edge each spring and lift entire unwanted pieces before they weave through neighboring crowns. Leaf removal alone does not control the underground stems, and cut fragments must be handled as poisonous plant material.

All parts contain cardiac glycosides and must not be eaten. Wear gloves for division and cleanup, keep prunings and attractive berries away from children and animals, and seek medical or veterinary advice after suspected ingestion rather than inducing vomiting. Green leaves should remain until they yellow naturally.

Family
Asparagaceae
Range
Europe to the Caucasus
Soil pH
5–8
Spread
1–2 ft initially; colony expands · 30–60 cm initially; colony expands

Planting & careHow to grow lily-of-the-valley

The species is introduced across much of temperate North America and is reported invasive in Wisconsin and Arkansas. It also performs poorly in hot, humid summers; consult local guidance before planting.

  1. 1
    Reserve the mature footprint

    Plan for 6–10 in of top growth and an underground colony that will extend beyond its first 1–2 ft patch. Choose a boundary that can be inspected and dug without disturbing valued neighbors.

  2. 2
    Choose cool shade

    Use dappled to full shade with fertile, humus-rich soil that stays moist during spring. Avoid treating a hot, humid exposure as suitable merely because irrigation is available.

  3. 3
    Set the rhizome base about 3 inches deep

    Arrange each rooted division with its growing point upright and the base of the rhizome about 3 in below the surface. Spread the roots, refill with site soil, and water thoroughly.

  4. 4
    Establish an even spring moisture level

    Keep newly planted roots evenly moist through active growth without leaving them in stagnant soil. Established mats can tolerate a dry interval, so check below the surface before adding water in summer.

  5. 5
    Mark and monitor the boundary

    Place durable markers around the intended colony while the shoots are visible. Top-dress lightly with leaf mould in autumn, then inspect outside the markers for wandering rhizomes each spring.

  6. 6
    Plan poisonous-waste handling

    Wear gloves when lifting excess rhizomes, gather every cut piece and berry, and dispose of them where children, pets, and livestock cannot reach them. Wash hands and tools after the work.

Pruning lily-of-the-valley

No shaping prune is needed. Leave green foliage after bloom, remove it only after yellowing, and control spread by lifting complete unwanted rhizomes in spring or autumn while wearing gloves.

Seasonal care

Spring

Map the emerging shoots against the marked boundary, lift wandering rhizomes before they enter other crowns, and keep the spring root zone evenly moist.

Summer

Let leaves finish their work after flowering. Water new plantings during dry spells, but recognize that mature foliage may decline early in hot summers even when the rhizomes remain dormant below.

Autumn

Remove yellow foliage and any red berries with gloves, divide if the colony needs reduction, and top-dress the bed lightly with leaf mould without losing the boundary markers.

Winter

The colony is dormant underground. Do not dig or plant into the marked area, and check that stored prunings or lifted rhizomes remain inaccessible to people and animals.

Safety and garden spread

Regional invasive risk

Rhizomes can crowd out neighboring plants. NC State reports invasive behavior in Wisconsin and Arkansas; consult local guidance before planting.

Reported region: Wisconsin and Arkansas, United States

NC State Extension

Common problems

  • Rhizomes beyond the boundary

    Look for
    New paired leaves emerge outside the marked patch or among neighboring woodland plants.
    Action
    Trace each shoot to its rhizome and lift the whole unwanted section while the soil is workable. Recheck the same edge the next spring; cutting leaves does not stop underground spread.

  • Hot-summer foliage decline

    Look for
    Leaves yellow or collapse early during sustained heat and humidity despite adequate spring growth.
    Action
    Check soil moisture and rule out rot, then allow natural dormancy rather than forcing soft new growth with fertilizer. In marginal climates, replace the colony with a locally suitable groundcover.

  • Leaf spot or stem rot

    Look for
    Spots expand on leaves, or shoots soften at the soil line in a persistently wet, crowded mat.
    Action
    Remove affected material with gloves, avoid wetting foliage late in the day, and improve air movement. Ask an extension service to identify progressive disease before applying a labeled treatment.

  • Dense leaves but fewer flowers

    Look for
    An established mat remains leafy in spring but produces fewer racemes than in earlier years.
    Action
    Divide an overcrowded section in spring or autumn and replant selected rhizomes at the correct depth. Do not increase fertilizer without a soil-based reason.
  • Garden study showing the placement and growth habit of Lily-of-the-Valley
    Garden study showing the placement and growth habit of Lily-of-the-Valley

Sources

  1. Lily-of-the-Valley cultivation profile. NC State Extension. Source record · Accessed 2026-09-07.
  2. Convallaria majalis plant profile. Royal Horticultural Society. Source record · Accessed 2026-08-30.
  3. Convallaria majalis taxonomy and native range. Royal Botanic Gardens, Kew. Source record · Accessed 2026-08-30.
  4. Potentially harmful garden plants. Royal Horticultural Society. Source record · Accessed 2026-08-30.