May lily

Maianthemum bifolium
Poisonous
May lily
Photo: Piotr Lukasik, CC BY, iNaturalist
May lily
Photo: Stefan.lefnaer, CC BY-SA, Wikimedia Commons
May lily
Photo: Katrin Simon, CC BY, iNaturalist

Never eat berries you are not sure about and never give unknown berries to children. In case of poisoning call 112 (103 in Ukraine).

About

May lily is a low perennial plant 5–20 cm tall. Thanks to its long creeping rhizome, it covers the forest floor in entire carpets. On the flowering stem, there are two alternate heart-shaped leaves with arcuate veins; in non-flowering plants, there is only one leaf on a long petiole.

It blooms in May – June. At the top of the stem, a cluster of 10–25 small fragrant white flowers opens; each has four petals that are bent backward. The berries are spherical, 4–6 mm, initially greenish with red spots, and by the end of summer – cherry-red and shiny.

In the Carpathians, May lily is one of the most common herbs in spruce, fir, beech, and mixed forests on acidic soils. It grows from the foothills to the upper forest limit, also found in crooked forests, often alongside bilberry and cowberry.

The entire plant, especially the berries, is poisonous: it contains substances that affect the heart and irritate the stomach and intestines. The red berries ripen at the time of harvesting bilberries and grow in the same forests, so be cautious when children are picking berries.

It is difficult to confuse May lily with cowberry if you look at the leaves. Cowberry is an evergreen shrub with small leathery leaves on woody stems. In May lily, the stem is herbaceous, and there are only two large heart-shaped leaves.

Where in the Carpathians

approximate rangerecords:fewermore4 574 records in the Carpathians

Teal — roughly where the species can occur, by elevation and habitat; orange — where naturalists recorded it (GBIF, CC0/CC BY).

Range: elevation belt and forests — our model (AWS Terrain Tiles; © OpenStreetMap)

Countries
Ukraine · Slovakia · Czechia · Poland · Romania · Hungary
Mountain ranges
nearly all Carpathian ranges, in the forest belt
Altitude belts
Foothills (below 600 m) · Beech forests (600–1200 m) · Conifer forests (1200–1600 m)

When to see it

JanFebMarAprMayJunJulAugSepOctNovDec
Flowering
Fruit

From naturalists’ observations in the Carpathians (iNaturalist, research grade): the darker the cell, the more often the species is seen that month.

Safety

The entire plant is poisonous, especially the red berries. Do not taste them and keep an eye on children. In case of suspected poisoning, call 103 (or 112).

Look-alikes — how to tell them apart

LingonberryVaccinium vitis-idaeaEdible

An evergreen shrub with small leathery leaves; berries are gathered in dense clusters on woody stems.

Lily of the ValleyConvallaria majalisDeadly poisonous

A significantly larger plant with two to three long broad leaves from the ground; flowers are white bells, berries are orange-red and larger.

Protection and rules

Not listed in the Red Book of Ukraine.

FAQ

Are the berries of May lily poisonous?

Yes. The red berries, like the entire plant, are poisonous: they affect the heart and digestion.

How to distinguish May lily from cowberry?

May lily has a soft herbaceous stem with only two large heart-shaped leaves. Cowberry is a shrub with many small leathery leaves.

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Similar species

Where to meet it

Trails

Peaks and meadows

Waters and waterfalls

Mountain ranges: In other countries: 🇸🇰 Slovak Ore Mountains, 🇸🇰 Greater Fatra, 🇸🇰 High Tatras, 🇸🇰 Strážov Mountains, 🇸🇰 Volovec Mountains, 🇸🇰 Lesser Fatra, 🇸🇰 Low Tatras, 🇨🇿 Moravian-Silesian Beskids, 🇸🇰 Western Tatras, 🇸🇰 Belianske Tatras, 🇵🇱 Żywiec Beskids, 🇸🇰 Slovak Paradise, 🇨🇿 White Carpathians, 🇸🇰 Levoča Mountains

Trails and peaks near which naturalists recorded the species (GBIF, iNaturalist), matched by altitude and habitat. Sightings are not guaranteed.

Sources

GBIF · iNaturalist · Wikidata · Distribution data: GBIF.org (CC0 and CC BY records), iNaturalist; names and identifiers: Wikidata (CC0). Text: Karpaty.rocks, checked 11.11.2026.