Lily of the valley (Convallaria majalis) is a hardy shade perennial famous for its sprays of nodding, bell-shaped white flowers and an intense sweet fragrance that fills the spring garden. It spreads by underground rhizomes to form a dense, weed-smothering groundcover under trees and along the north side of buildings where little else will thrive. That same vigor makes it a determined spreader, so the art of growing it is choosing the right spot, planting it correctly, and keeping it in bounds. This guide covers zones, planting pips, care, controlling its spread, and division.
In this guide
Key Takeaways
- Zones: Hardy in USDA zones 2 through 7 (to 8 in cool spots); it needs winter cold and dislikes hot, humid summers.
- Light & soil: Partial to full shade in rich, moist, well-drained soil; ideal under trees and on north-facing beds.
- Planting: Set pips (rhizome buds) one to two inches deep, spaced about four to six inches apart, in fall or early spring.
- Spread: It spreads aggressively by rhizomes; contain it with edging or a buried barrier where space is limited.
- Toxicity: Every part of the plant is highly poisonous to people and pets, so handle with care.
Hardiness Zones and Climate
Lily of the valley is extremely cold-hardy, thriving in USDA zones 2 through 7 and tolerating zone 8 in cooler microclimates. It requires a cold winter dormancy to perform well, so it is not suited to mild, frost-free regions. Its preference is for the cool, moist conditions of temperate and northern climates, where it spreads happily and blooms reliably each spring.
In areas with hot, humid summers it tends to struggle, with foliage browning and scorching by late summer, so deep shade and consistent moisture become essential the farther south you grow it. In its ideal range, though, it is one of the toughest, most carefree groundcovers available and naturalizes readily, which is both its greatest strength and the reason to plant it thoughtfully.
Light and Soil
This is a true shade plant. Partial to full shade is ideal, which makes lily of the valley invaluable for the difficult dry, shady spots under trees, along the north side of a house, or anywhere taller plants cast steady shadow. It will tolerate some morning sun in cool climates, but full sun, especially with summer heat, scorches the foliage and stresses the plant.
It is not fussy about soil and will grow in most conditions, but it performs best in rich, humusy, moist yet well-drained ground. Amending the bed with compost or leaf mold before planting gives it the organic matter it loves and helps retain moisture. A slightly acidic to neutral pH is fine. Once established it tolerates the root competition and dry shade beneath trees better than almost any other ornamental, which is exactly why gardeners reach for it. For more shade-loving plants, browse our Plants & Flowers section.
How to Plant Lily of the Valley Pips
Lily of the valley is usually sold and planted as “pips,” which are the individual rhizome buds with a tuft of roots attached. The best planting times are fall, which gives the pips a winter to settle in before spring growth, or early spring. Soak the pips in water for a few hours before planting to rehydrate them. Plant each pip one to two inches deep with the pointed bud facing up, and space them about four to six inches apart, knowing they will quickly knit together into a solid carpet.
Water the bed thoroughly after planting and add a light layer of mulch or leaf litter, which mimics the woodland conditions the plant evolved in. Do not expect a heavy bloom the first spring; pips often spend their first year establishing roots and may flower sparsely, hitting full stride in the second and third years. Because the foliage and flowers, the rhizomes, and even the red berries that follow are all highly toxic, wear gloves while planting and wash your hands afterward.
Watering, Feeding and Care
The main ongoing need is moisture. Keep the soil consistently moist, especially during the first growing season and through dry spells, since dry soil causes the leaves to brown and go dormant early. A maintained mulch layer holds moisture and keeps the roots cool, reducing how often you need to water. In a suitably shaded, cool site, established plantings often get by on rainfall alone.
Feeding needs are modest. A spring topdressing of compost or a single application of balanced fertilizer as growth begins is all it requires; over-fed plants put energy into foliage and spread rather than flowers. Leave the foliage in place after blooming, as it feeds the rhizomes for next year, and let it die back naturally in late summer or fall. Cut back the spent foliage once it has fully yellowed. An annual layer of leaf mold each fall keeps the planting lush and self-sustaining.
Controlling Its Spread
Lily of the valley spreads aggressively by creeping underground rhizomes and can colonize an area faster than you expect, escaping into lawns and crowding out smaller neighbors. In a large woodland or naturalized setting this is a feature, but in a tidy border it can become a nuisance and is considered invasive in some regions. Plant it where its spread is welcome, or contain it deliberately.
To keep it in bounds, install a physical barrier such as deep edging or a buried plastic or metal border that extends at least six to eight inches down, since the rhizomes run shallowly. Growing it in a sunken bottomless container or a contained bed also works. If it does spread where you do not want it, dig out the rhizomes, knowing that any fragment left behind can resprout, so be thorough. The same vigorous rhizome growth that makes it spread also makes it easy to divide and share, much like other spreading shade perennials such as bleeding heart.
Dividing Lily of the Valley
Over a few years a planting becomes crowded, and the center may bloom less as the pips compete. Dividing every three to four years rejuvenates the patch and gives you pips to start new colonies. The best time to divide is in fall after the foliage dies back, or in very early spring before growth resumes. Dig up a clump, shake off the soil, and you will see the tangle of rhizomes studded with individual pips.
Pull or cut the clump apart into sections, each with several pips and healthy roots, and replant them at the same one-to-two-inch depth, spaced a few inches apart, in their new spot. Water the divisions in well and mulch lightly. Division is essentially the same as propagation for this plant, and because it spreads so readily, a single thriving patch can supply pips for years. Always wear gloves when dividing, as the rhizomes are toxic like the rest of the plant.
Common Problems and Toxicity
Lily of the valley is remarkably pest- and disease-free, which is part of its appeal. The most common cosmetic issue is foliage that browns and dies back early in hot, dry summers; consistent moisture and deep shade prevent most of it, and the plant returns fine the next spring. In wet, crowded conditions, occasional fungal leaf spots, anthracnose, or stem rot can appear, and improving airflow by dividing crowded clumps and removing affected leaves keeps them in check. Few pests bother it, though slugs and weevils may nibble the leaves.
The most important thing to know is its toxicity. Every part of lily of the valley, including the leaves, flowers, rhizomes, and the bright red berries that follow the blooms, contains cardiac glycosides and is highly poisonous to humans, dogs, cats, and livestock if ingested. The attractive berries are a particular hazard for children and pets. Plant it where curious pets and young children will not be tempted, wear gloves whenever you handle it, and seek medical or veterinary help immediately if any part is eaten. With that precaution in mind, it remains one of the easiest and most rewarding shade groundcovers you can grow.
Frequently Asked Questions
How deep and far apart do I plant lily of the valley pips?
Plant pips one to two inches deep with the pointed bud facing up, spaced about four to six inches apart. Soak them in water for a few hours first. They spread quickly by rhizomes, so even spaced planting fills in to form a dense carpet within a season or two.
How much sun does lily of the valley need?
It prefers partial to full shade and is ideal for dry shade under trees or on the north side of a building. It tolerates some morning sun in cool climates, but full sun and summer heat scorch the foliage, so the shadier and cooler the spot, the better it performs.
How do I stop lily of the valley from spreading?
Contain it with a buried barrier or deep edging that extends six to eight inches down, since its rhizomes run shallowly, or grow it in a sunken bottomless container. To remove unwanted spread, dig out the rhizomes thoroughly, as any fragment left behind can resprout.
Is lily of the valley poisonous to pets and children?
Yes, severely. Every part of the plant, including the leaves, flowers, rhizomes, and red berries, contains cardiac glycosides that are highly toxic to people, dogs, cats, and livestock. Keep it away from children and pets, wear gloves to handle it, and get medical or veterinary help immediately if any is eaten.
When should I divide lily of the valley?
Divide every three to four years to rejuvenate crowded clumps, working in fall after the foliage dies back or in very early spring before growth starts. Dig the clump, separate it into sections with several pips and roots each, and replant at the same depth a few inches apart.
Lily of the valley is the answer to a shady, difficult corner: plant the pips in rich moist soil, keep it watered through its first summers, and it will reward you with fragrant spring bells and a carpet of green. Just respect its vigorous spread and its serious toxicity, contain it where needed, and divide it every few years to keep the patch fresh and full.