# Dog's Mercury (*Mercurialis perennis*)

Dog's Mercury is a green plant that grows in shady places like forests. It has lovely leaves and small flowers that are not very bright but are special to the plants around it.

- **Category:** [Plants](https://www.snappit.app/explore/categories/plant)
- **Rarity:** Common
- **Danger:** 2/5 · Low
- **Habitat:** Forests

![Dog's Mercury](https://commons.wikimedia.org/w/index.php?title=Special:Redirect/file/Mercuralis_perennis.jpg&width=800)

Photo: Public domain · [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:Mercuralis_perennis.jpg)

## Appearance

The Dog's Mercury has bright green, oval-shaped leaves that taper to a point, often slightly hairy. Its inconspicuous greenish flowers grow on upright, unbranched stems, with male and female flowers appearing on separate plants.

## Taxonomy

- **Kingdom:** Plantae
- **Phylum:** Tracheophyta
- **Class:** Magnoliopsida
- **Order:** Malpighiales
- **Family:** Euphorbiaceae
- **Genus:** Mercurialis

## Interesting facts

- Dog's Mercury gets a head start, blooming early before forest trees have leaves!
- It's super good at spreading, often carpeting entire woodland floors!
- Its male and female flowers grow on totally separate plants – a plant split!
- Squashed Dog's Mercury can turn blue, a surprising color-changing trick!

## Special abilities

- **Rapid Colonizer:** Dog's Mercury can quickly spread underground using rhizomes, forming dense carpets across the forest floor.
- **Early Bloomer:** Dog's Mercury has evolved to bloom in early spring, capturing sunlight before tree leaves fully emerge.
- **Toxicity Shield:** Dog's Mercury has toxic compounds that deter most herbivores, helping it stay safe from being eaten.

## Measurements & details

- **Height:** 10-40 cm
- **Spread:** 20-100 cm
- **Bloom Season:** Early spring (February-April)
- **Edible:** No
- **Toxicity:** Deadly
- **Lifecycle:** Perennial
- **Pollination Method:** Wind

## Ecological connections

- **Eats:** Mercury leaf beetle (*Chrysolina fastuosa*) — Its larvae feed on the leaves of the plant.
- **Shelter:** Wood mouse (*Apodemus sylvaticus*) — Hides among its dense ground cover in woodlands.
- **Depends on:** Common earthworm (*Lumbricus terrestris*) — Decomposes its fallen leaves, enriching the soil with nutrients.

## Traits

- [Deciduous](https://www.snappit.app/explore/traits/deciduous): Deciduous plants periodically shed all their leaves, typically during autumn or dry seasons.
- [Flowering](https://www.snappit.app/explore/traits/flowering): Flowering plants are any plants that produce flowers as part of their reproductive cycle.
- [Shade Tolerant](https://www.snappit.app/explore/traits/shade-tolerant): Shade tolerant plants are adapted to grow and thrive in areas with low light levels, requiring less direct sunlight.
- [Medicinal](https://www.snappit.app/explore/traits/medicinal): Medicinal plants possess chemical compounds that can be used for therapeutic purposes to treat illnesses or maintain health.
- [Forest](https://www.snappit.app/explore/traits/forest): Forest habitats are terrestrial environments dominated by dense tree cover, supporting a high diversity of plant and animal life.
- [Regenerative](https://www.snappit.app/explore/traits/regenerative): Regenerative organisms possess the ability to regrow lost or damaged body parts, tissues, or organs.

## Collections

- [Plants](https://www.snappit.app/explore/collections/plants)

## Safety

**Danger:** 2/5 · Low

Do not eat any plants you find outside unless an adult says it's safe.

## Frequently Asked Questions

### How to identify Dog's Mercury?

Start with the whole plant, then compare leaf arrangement, leaf edges, stems and any flowers or fruit. Opposite leaves grow in pairs; alternate leaves come one at a time along the stem. These details tell you far more together than a single green leaf does. Plant Identifier: upload a photo and compare the visible details.

### How tall is Dog's Mercury?

10-40 cm

### How wide does Dog's Mercury spread?

20-100 cm

### When does Dog's Mercury bloom?

Early spring (February-April)

### Is Dog's Mercury edible?

No

### Is Dog's Mercury toxic?

Deadly

### What is Dog's Mercury's lifecycle?

Perennial

### How is Dog's Mercury pollinated?

Wind

## Where to spot

- [TERRA.vita Nature and Geopark](https://www.snappit.app/guides/places/terra-vita-nature-and-geopark) — Niedersachsen; Nordrhein-Westfalen, DE · Park

## More Plants

- [white snakeroot](https://www.snappit.app/explore/white-snakeroot) (*Ageratina altissima*)
- [tree-of-heaven](https://www.snappit.app/explore/tree-of-heaven) (*Ailanthus altissima*)
- [western sword fern](https://www.snappit.app/explore/western-sword-fern) (*Polystichum munitum*)
- [common milkweed](https://www.snappit.app/explore/common-milkweed) (*Asclepias syriaca*)

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Source: [Dog's Mercury: Facts & Places to See — Snappit](https://www.snappit.app/explore/dogs-mercury)