Bulb · Asparagaceae
Lily of the Valley
Convallaria majalis
Sweet little white bells that'll carpet the shade for you, though every part of them is poisonous.
Partial shade
Every 5–10 days
USDA 3–8
6–12 in · 15–30 cm
Overview
Lily of the valley is one of those low woodland perennials people fall for fast, thanks to its arching stems of small, white, nodding bells and a scent that's about as sweet as spring gets. It travels underground on creeping rhizomes called pips, so before long it's woven itself into a dense green carpet under the trees or along the shady north side of the house. And the broad paired leaves? They keep looking good well after the flowers are gone.
Here's the nice part: it barely asks for anything. It's hardy from zone 3 to 8, so cold winters don't faze it, and it settles right into the dappled to full shade where most flowers just give up. Hand it moist, rich soil and it'll take off, which is half the fun and half the headache, because it can crowd out its neighbors and has even been flagged as invasive in some regions.
But there's a real catch you can't ignore. Every part of this plant, from the fragrant flowers to the bright red berries, is packed with cardiac glycosides that can throw the heart into a dangerous rhythm. So go ahead and enjoy how pretty and easy it is, but plant it somewhere the pets and kids simply can't get at it.
Care
The short version: tuck the pips into dappled to full shade, keep that rich soil evenly moist, and split the crowded clumps every few years. And wear gloves any time you handle it.
Light
Give it dappled to full shade, those dim spots under the trees or on the cool side of a wall where hardly anything else will flower. It'll take a bit of morning sun without complaint, but hot afternoon light scorches the leaves and pushes the whole colony into an early decline, so lean shady when you can.
Water
Keep that rich soil evenly moist, watering about every 5 to 10 days, and more often when things turn dry. An established colony can ride out a summer drought if it has to, but the leaves get ragged when they're thirsty, so a good drink through the long dry stretches keeps everything looking fresh.
Soil
It's after moist, fertile, organically rich ground that still drains alright. Got heavy clay or a drier patch? No big deal, it copes with both, but the lushest, fastest-spreading colonies show up where the soil holds moisture and you've worked in plenty of compost.
Temperature
Cold's honestly a non-issue here. This is an iron-hard perennial that takes winters all the way down to -40°F (-40°C) and grows away happily up to around 84°F (29°C), past which the heat and sun start wearing the foliage down.
Humidity
Regular outdoor air is all it needs, so there's no number to chase on this one. What matters way more is good air movement, because a crowded, still, damp corner is exactly what invites leaf spot onto the foliage.
Feeding
One feed in spring, as the new growth pushes up, and you're done. A top-dressing of compost or a balanced general-purpose fertilizer is all it wants, and a yearly mulch of leaf mold keeps an established patch happy.
Pruning
There's not much to it. Snip off the spent flower stems and cut back the tired foliage in late summer or fall once it yellows. Always wear gloves, though, since every part of the plant is poisonous to handle and to eat.
Repotting
In the ground it's all about dividing, not repotting. Every 3 to 5 years, lift the congested colonies and split them to keep the clumps going strong, because crowded plantings flower less and start thinning out in the middle.
Size & spacing
These stay nice and low, only 6 to 12 inches (15 to 30 cm) tall, and each one spreads 9 to 12 inches (23 to 30 cm) wide before it all merges into solid groundcover. So space the pips with that wandering habit in mind, knowing they'll fill in the gaps as time goes on.
When to plant
Lily of the valley just rolls with the seasons. Get the pips in the ground in fall or early spring, and those sweet white bells will show up from April into early summer, right before the colony settles into its quiet summer green.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Plant: Plant rhizomes (pips) in fall or early spring.
- Harvest: Blooms early to mid-spring (April to early summer).
Hardiness
USDA hardiness zones: 3–8
Temperature: down to -40°C
Troubleshooting
The good news is this plant is tough and pretty forgiving, so most of what goes wrong is minor and comes down to the weather or a soggy spot. Catch the early signs on the leaves and stems and you can step in before anything really takes hold. Just match up what you're seeing below and act while it still does some good.
Stems going soft and rotten, toppling at the base
When the stems go mushy and lose their color, that's stem rot talking, and it shows up when the soil stays wet and just won't drain. Get the rotted stuff out and toss it so it can't spread to the rest. Then sort out the drainage and back off the watering, and the planting will pull through.
Fix:
- Improve soil drainage
- Reduce excess moisture
- Remove and dispose of rotted material
Leaves showing brown or tan patches and spots
Spots like these usually mean fungal leaf spot, leaf blotch, or anthracnose, which love the damp shade this plant calls home. They start small, but let the weather stay wet and they'll swell up and run into each other. So pull off the marked leaves, sweep up the fallen bits, and water at the soil line so the leaves can stay dry.
Fix:
- Remove and dispose of affected leaves
- Improve air circulation and avoid wetting foliage
- Water at the soil line
Leaves going yellow and brown over summer
Seeing the leaves fade in the summer heat? That's almost always just heat and drought stress, not some disease. Give it too much sun or let it go thirsty and the fade shows up faster. But mulch to keep the moisture in, water it through the dry weeks, and the colony will be right back next spring.
Fix:
- Provide shade and consistent moisture
- Mulch to conserve soil moisture
- Site in dappled to full shade
New growth twisted up, with tiny bugs or webbing
Two little pests are usually behind this one. Aphids pile onto the soft new growth and twist it up, and spider mites leave that telltale fine webbing when things get dry. Take a look under the leaves to see which you've got, hit them with a strong jet of water, and only bother with insecticidal soap if they won't quit.
Fix:
- Spray with a strong jet of water
- Apply insecticidal soap if needed
- Remove heavily infested foliage
Toxicity
This is one of the most poisonous plants you'll ever put in a garden, so it really does deserve your full attention. Every part carries cardiac glycosides, and that means the sweet flowers, the leaves, the red berries, and even the water a cut stem has been sitting in. Swallow any of it and you're looking at vomiting and dangerous changes to the heartbeat, and a big enough dose can be fatal to pets, livestock, and people alike.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds · People
Cats Severe
Even a tiny nibble is bad news for a cat. You'll likely see drooling and vomiting first, then real weakness as the heartbeat slows down and slips out of rhythm, and a big enough dose can actually stop the heart.
Dogs Severe
Keep an eye out for vomiting, a pulse that's either sluggish or racing, low blood pressure, and collapse. Those same cardiac glycosides that hurt cats can kill a dog too, so if there's any chewing, treat it as an emergency.
Horses Severe
A horse that grazes on the leaves can wind up with colic, a scary irregular heartbeat, and staggering. It's a severe poisoning that can turn fatal, so don't wait around to call the vet.
Rabbits Severe
The cardiac glycosides really knock rabbits around, bringing on gut upset, a shaky heart rhythm, and sudden weakness. So keep them well away from every part of the plant.
Livestock Severe
Cattle, goats, and sheep all get poisoned by the leaves, flowers, and berries the same way, with heart-rhythm failure that can be deadly. And here's the catch: dried plants in hay stay just as toxic.
Birds Severe
Birds are super sensitive to these heart toxins, and even a small amount can throw the heartbeat into a fatal rhythm. So keep the plant and its berries away from them completely.
People Caution
No part of this plant is food, plain and simple. Eat the flowers, leaves, or red berries, or even sip the vase water, and you can end up with vomiting and dangerous changes in heart rhythm. Keep it well away from kids, and call poison control if anyone swallows some.
Wear gloves when handling, and keep all parts including the sweet-smelling flowers and red berries away from pets and children. Wash hands after contact.
Helpline numbers
United States
ASPCA Animal Poison Control: (888) 426-4435 (fee applies)
Poison Control: (800) 222-1222
Canada
Poison Centres: 1-844-764-7669
Varieties
Most plantings are just the plain white species, and honestly it's lovely, but a couple of named forms pop up now and then if you're after something a bit different.
var. rosea
It's the pink one, trading the usual white bells for soft, light pink blooms instead.
Golden Slippers
You grow this one for the leaves, not the flowers, since they come in chartreuse to golden yellow.
Companions
Lily of the valley pairs best with shade-loving plants that share its taste for moist, rich soil, the kind of company it keeps on a woodland floor.
Plant near
Hosta: Shares the same shade and moist, rich soil preferences as a woodland groundcover companion.
Ferns: Thrive in the same dappled to full shade and moist conditions.
How to propagate
Making more of it is easy, mostly because the plant's already built to multiply on its own underground. You can split off what it's grown or start from seed, but one of those routes is a whole lot quicker than the other.
DivisionEasy
Fall or early spring · One to two growing seasons
Division is the sure bet, and it's what most gardeners go with anyway. When fall or early spring comes around, lift an established clump and pull the rhizomes, which are called pips, apart into pieces. Pop them back in the ground and they'll settle over one to two growing seasons. Just wear gloves, because every part of the plant is poisonous.
SeedModerate
Fall · Several years
Seed? That's the slow lane. Sow in fall, put up with patchy germination, and wait several years before the plants really do much. Since division gets you there so much faster, most gardeners just don't bother with seed.
Myths
Those sweet-scented flowers and red berries are totally fine to nibble.
Nope, every part of this plant is poisonous, and that includes the fragrant flowers and those bright berries that always catch a child's eye. They're loaded with cardiac glycosides that can throw the heart into a dangerous rhythm. A taste is never safe, and a larger amount can be fatal.