Lily of the Valley Care: Growing, Toxicity & Spread Control

Lily of the valley care begins with planting rhizome pips 1 inch deep and 6 inches apart in moist, rich, well-drained soil in part to full shade within USDA hardiness zones 3 to 8. Convallaria majalis blooms in early to mid spring with fragrant white bells for 2 to 3 weeks. Every part of the plant is highly toxic to people and pets, including the water in a vase holding cut stems. It also spreads aggressively by underground rhizomes and is considered invasive across the Midwest and Northeast.

Convallaria majalis is not a true lily. It belongs to the asparagus family, Asparagaceae. The plant is native to Europe and temperate Asia and has naturalized across much of North America. Each specimen sends up 2 or 3 broad, parallel-veined leaves. From their center rises a slender, one-sided raceme of 5 to 10 pendent, bell-shaped white flowers. In fall, pollinated plants may produce small orange-red berries. It is also known as May lily or May bells. The plant grows from pointed rhizome buds called pips. For more shade-loving plants, see our growing guides in The Lab.

Quick Answer: Plant lily of the valley pips 1 inch deep in moist, rich soil in part to full shade in USDA zones 3 to 8. Water regularly to keep soil evenly moist. All parts are toxic to people and pets, including vase water. It spreads by rhizomes and is invasive in the Midwest and Northeast. Contain it in a buried pot to restrict spread.

What Is Lily of the Valley and Where Does It Grow?

Convallaria majalis is a rhizomatous perennial groundcover native to Europe and temperate Asia. It grows 6 to 12 inches tall and spreads indefinitely by underground rhizomes. It prefers cool-summer climates in USDA hardiness zones 3 to 8. The plant thrives in part to full shade with moist, rich, well-drained soil. It tolerates clay and some dryness once established but flowers best in cool, humid conditions.

According to the Missouri Botanical Garden, lily of the valley is a rhizomatous perennial that typically grows 6 to 12 inches tall. It spreads indefinitely by rhizomes, forming dense colonies. It is native to Europe and Asia. The plant features broad, parallel-veined leaves and one-sided racemes of fragrant, bell-shaped white flowers in spring.

The genus name derives from the Latin convallis, meaning valley, and majalis, meaning of May. This references both its habitat preference and its bloom period. It is not a true lily. Taxonomists place it in the asparagus family, Asparagaceae. It was formerly classified in Liliaceae or Ruscaceae. The common names include May lily and May bells. The plant grows from pointed rhizome buds called pips.

Is Lily of the Valley Poisonous to Touch or Ingest?

All parts of lily of the valley are toxic if ingested, including the leaves, flowers, berries, and the water in a vase holding cut stems. Handling the plant can irritate sensitive skin, so gloves are recommended. The primary danger is ingestion, not casual touch. The toxic compounds are cardiac glycosides such as convallatoxin that affect heart rhythm directly.

According to research published in PMC, lily of the valley contains cardiac glycosides including convallatoxin, convallarin, and convallamarin. These compounds have a digitalis-like effect on the heart. A documented case involved a dog that developed vomiting, bradycardia, and hyperkalemia after ingesting the plant. The authors note that all plant parts contain these toxins.

The water in a vase where cut stems have stood absorbs these cardiac glycosides. Never leave vase water within reach of children or pets. Discard it down a sink drain, not into garden soil. If someone ingests any part of the plant or drinks vase water, contact Poison Control at 800-222-1222 immediately. If skin irritation develops after handling, wash the area with soap and water. Wear gloves when planting, dividing, or removing this plant.

Is Lily of the Valley Poisonous to Dogs and Cats?

Yes. Lily of the valley is toxic to dogs, cats, and horses according to the ASPCA. Ingestion causes vomiting, a slow or irregular heartbeat, low blood pressure, disorientation, seizures, and in severe cases coma. The toxic principle is cardiac glycosides, not the same mechanism as true lily toxicity in cats.

The ASPCA lists Convallaria majalis as toxic to dogs, cats, and horses. Clinical signs of ingestion include vomiting, diarrhea, a drop in heart rate, cardiac arrhythmia, and possible seizures. The severity depends on the amount consumed and the size of the animal. Unlike true lilies (Lilium and Hemerocallis species) which cause acute kidney failure in cats, lily of the valley affects the heart through cardiac glycosides.

If you suspect your pet has eaten any part of the plant, treat it as an emergency. Call your veterinarian or the ASPCA Animal Poison Control Center at 888-426-4435 immediately. Do not wait for symptoms to worsen. Do not induce vomiting without explicit veterinary direction. For a list of safe alternatives, browse our cat-safe plants guide.

How Do You Plant Lily of the Valley from Roots?

Plant lily of the valley from pips, which are pointed rhizome buds, in fall or early spring while the plant is dormant. Set each pip with the pointed bud facing upward, about 1 inch below the soil surface, spreading the roots outward. Space pips 6 inches apart. They will knit together into a dense carpet over 2 to 3 seasons.

According to the University of Wisconsin Extension, lily of the valley is easily grown in average, medium, well-drained soil in part shade to full shade. It spreads rapidly by rhizomes to form large colonies. The extension recommends planting pips in spring or fall. Soak the pips in room-temperature water for a few hours before planting to rehydrate the roots.

Follow this protocol for planting from pips. Choose a shady spot with moist, rich, well-drained soil. Dappled shade beneath deciduous trees or on the north side of a building is ideal. Loosen the soil and work in compost or aged manure. If your soil is heavy clay, mix in coarse sand or fine grit to improve drainage. Soak the pips in room-temperature water for 2 to 4 hours before planting. This rehydrates desiccated roots and improves establishment. Set each pip with the pointed bud facing upward. Plant 1 inch below the soil surface. Spread the roots gently around the pip. Space pips 6 inches apart. Backfill, firm gently, and water thoroughly. Apply a 2-inch layer of mulch.

1. Choose a shady spot. Select part to full shade with moist, rich, well-drained soil. Dappled shade beneath trees or the north side of a house is ideal.
2. Prep the soil. Loosen soil and work in compost or aged manure. Add coarse sand to heavy clay to improve drainage.
3. Soak the pips. Submerge rhizome pips in room-temperature water for 2 to 4 hours to rehydrate roots before planting.
4. Plant pips bud up, 1 inch deep. Set each pip with the pointed bud facing upward, 1 inch below the soil surface, spreading roots outward.
5. Space 6 inches apart. Give each pip 6 inches. They will knit into a dense carpet over 2 to 3 seasons.
6. Cover, firm, and water. Backfill, firm gently, water thoroughly, and apply a 2-inch mulch layer.

What Is the Bloom Time for Lily of the Valley?

Lily of the valley blooms in early to mid spring for approximately 2 to 3 weeks. The exact timing depends on local climate and spring temperatures. In cooler regions, blooms may appear in late April. In warmer zones, flowering occurs in March or early April. The fragrance is strongest during the first week of bloom.

Each plant sends up 2 or 3 broad leaves. From their center rises a slender, one-sided raceme. It carries 5 to 10 pendent, bell-shaped white flowers. The flowers are not true bells. They are fused petals forming a campanulate corolla. The scent is sweet and intense. It is one of the most recognizable fragrances in temperate gardens. After pollination, plants may produce small orange-red berries in fall. These berries are highly toxic. Remove them if children or pets are present.

If a colony stops blooming, overcrowding is the usual cause. Divide the clump in fall or early spring to restore flowering. Each division should contain at least 1 pip with attached roots. Replant immediately at the same depth.

What Is the Best Lily of the Valley Care Routine?

The best care routine is minimal intervention. Keep soil evenly moist, especially during the first growing season. Apply a top-dressing of compost each fall. No pruning is needed. Leave foliage in place after flowering. The leaves photosynthesize and feed the rhizomes for the following year. Deer and rabbits avoid it due to toxicity.

Water requirements are moderate to high. Do not let the soil dry out completely. Drought stress causes foliage browning at the edges and reduces flowering the following spring. In hot summers, increase watering frequency. Mulch helps retain moisture and moderate soil temperature. A 2-inch layer of shredded leaves or composted bark applied each autumn mimics the natural woodland floor where this plant evolved.

Fertilizer needs are low. A single top-dressing of compost in fall is usually sufficient. If your soil is particularly poor, apply a slow-release balanced fertilizer in early spring at half the label rate. Excess nitrogen produces lush foliage at the expense of flowers. The plant is naturally resistant to browsing by deer and rabbits. Pests are rare. If leaves yellow despite correct watering, test soil pH. The plant prefers slightly acidic to neutral soil at pH 6.0 to 7.0.

How Do You Grow Lily of the Valley in Pots?

Grow lily of the valley in deep containers or buried bottomless pots to restrict rhizome spread. Use a rich, moisture-retentive potting mix. Keep the container in part to full shade. Water when the top inch of soil begins to dry. Repot and divide every 2 to 3 years to prevent overcrowding and maintain bloom.

Container culture is the safest way to enjoy this plant without risking garden invasion. Select a pot at least 12 inches deep and 12 inches wide. Standard potting soil amended with compost works well. Ensure the container has drainage holes. Place the pot in a shady location. Water more frequently than in-ground plantings. Container soil dries faster. Fertilize container-grown specimens with a diluted liquid feed once in early spring. Divide and replant every 2 to 3 years. Overcrowded containers produce fewer flowers.

For in-ground plantings, the buried bottomless pot technique is effective. Sink a large nursery pot or bucket with the bottom removed into the soil. Plant the pips inside the pot. The rim should sit 1 inch above soil level. This barrier blocks rhizomes from escaping into surrounding garden beds. It allows drainage through the open bottom. Check the barrier annually. Rhizomes can eventually climb over the rim if mulch builds up.

How Do You Propagate and Replant Lily of the Valley?

Propagate lily of the valley by division in fall or early spring while the plant is dormant. Dig up a clump, gently tease the rhizomes apart into sections, and replant each section with at least 1 pip and some roots. Space divisions 6 inches apart at the original depth. Water thoroughly after replanting.

Division is the standard propagation method. It is reliable and fast. Growing from seed is possible but slow and rarely practical. Seeds require stratification and may take 2 to 3 years to produce flowering-sized plants. For home gardeners, division is the only sensible approach.

To divide, insert a spade or garden fork around the clump perimeter. Lift the entire root mass. Shake off excess soil. Gently pull the tangled rhizomes apart. Each section must contain at least 1 viable pip and a portion of roots. Discard any mushy or diseased rhizome sections. Replant divisions immediately. Do not let the roots dry out. Set them at the same depth they were growing previously. Water thoroughly. Apply mulch. Divisions typically re-establish within 4 to 6 weeks and bloom normally the following spring.

Do Lily of the Valley Spread and Are They Invasive?

Yes. Lily of the valley spreads aggressively by underground rhizomes and by seed. It forms dense colonies that crowd out native wildflowers and garden plants. It is considered invasive across much of the U.S. Midwest and Northeast and parts of Canada. Even a tiny rhizome fragment can resprout and establish a new colony.

According to Penn State Extension, lily of the valley is an invasive plant in Pennsylvania and much of the Northeast. It spreads by rhizomes and can form dense mats that exclude native vegetation. The extension recommends against planting it in naturalized areas. It is difficult to remove because rhizome fragments left in soil will regenerate.

The spread rate depends on soil quality and moisture. In ideal conditions, a single planting can cover a 3-foot diameter area within 2 to 3 years. The rhizomes grow horizontally 2 to 4 inches below the soil surface. They send up new pips at intervals. Seed dispersal by birds and small mammals adds to the spread. The berries are eaten and the seeds pass through the digestive tract unharmed. For comparison with another aggressive spreader, see our guide to removing Japanese knotweed.

How Do You Get Rid of Lily of the Valley for Good?

Complete removal requires digging out every rhizome fragment. Any piece left behind will resprout. Smothering with cardboard or an opaque tarp for a full growing season is an alternative. Glyphosate painted directly on foliage works as a last resort. Never compost removed material. Bag it as yard waste.

Manual removal is the most effective method but requires persistence. Dig down 6 to 8 inches. Sift the soil by hand or through a screen to remove all rhizome pieces. This is labor-intensive. It may need repeating over 2 to 3 growing seasons. Each missed fragment can generate a new plant.

Smothering is less laborious but slower. In early spring, cover the patch with cardboard or an opaque tarp. Weight it down and seal the edges with soil or mulch. Leave it in place for a full growing season. This blocks light and prevents photosynthesis. The rhizomes exhaust their stored energy over 12 to 18 months. Check periodically for growth at the edges.

Glyphosate herbicide painted directly onto foliage will kill the plant. It will also kill any other plant it contacts. Use a brush applicator for precision. Apply when plants are actively growing in spring. Repeat applications may be necessary. Do not spray on windy days. Dispose of all plant material in sealed bags as yard waste. Never compost lily of the valley. Rhizomes and seeds remain viable in compost piles.

Pro Tip: Plant lily of the valley in a buried, bottomless pot or don’t plant it at all. Loose in a garden bed, those innocent little pips become a decades-long eviction battle. The pot rim should sit 1 inch above soil level to prevent rhizomes from climbing over.

Frequently Asked Questions

Is lily of the valley poisonous to dogs and cats?

Yes. The ASPCA lists it as toxic to dogs, cats, and horses. Its cardiac glycosides can cause vomiting, an irregular heartbeat, low blood pressure, seizures, and coma. If your pet ingests any part, call your vet or ASPCA Animal Poison Control at 888-426-4435 immediately.

Is lily of the valley poisonous to humans or to touch?

All parts are toxic if eaten, including the berries and even the vase water. Handling it can irritate sensitive skin, so wear gloves. If someone ingests any part, contact Poison Control at 800-222-1222 or seek emergency care.

Where does lily of the valley grow best?

It grows best in part to full shade with moist, rich, well-drained soil in USDA zones 3 to 8. It tolerates some sun only if the soil stays consistently moist and prefers cool-summer climates.

How do you get rid of lily of the valley for good?

Dig out every rhizome fragment. Any piece left behind will resprout. Smother the patch with cardboard or a tarp for a full growing season. Glyphosate painted on leaves works as a last resort. Bag all material as yard waste. Never compost it.

What does lily of the valley symbolize?

It is the birth flower of May and symbolizes humility, purity, sweetness, and the return of happiness. In Christian tradition it is called Our Lady’s tears. It is the national flower of Finland.

Is lily of the valley invasive?

Yes. It spreads aggressively by rhizomes and seed, forming dense colonies that outcompete native plants. It is considered invasive in much of the U.S. Midwest and Northeast. Contain it in a buried pot to restrict spread.

Lily of the valley care rewards the cautious gardener with one of spring’s most intoxicating fragrances. The plant asks for little beyond shade and moisture. It gives much in return. The trade-off is vigilance. Toxicity demands placement away from children and pets. Invasiveness demands physical containment. Plant it with your eyes open to both its charms and its risks. For troubleshooting help, visit The Infirmary.