Cerastium arvense aka Mouse Ear Chickweed

Cerastium arvense is a cold-hardy perennial suited to temperate and boreal climates. It tolerates frost and overwinters without protection across a wide range of temperate zones. Info Flora documents it across the Alpine, Jura, and Mittelland regions of Switzerland, indicating reliable tolerance of cool mountain conditions. Go Botany records it as well established in the cold winters of New England (Connecticut, Maine, Massachusetts, New Hampshire, Vermont).

Cerastium arvense is a spring- and summer-blooming perennial. Flowering typically peaks from April to August, with seeds ripening from May to September. Division is best performed in spring when new growth begins. The plant dies back partially in winter, but the mat-forming root system and freely rooting prostrate shoots survive to regrow the following season.

Cerastium arvense produces white, star-shaped flowers with five deeply bilobate petals measuring 7.5–12.5 mm long — roughly twice the length of the five sepals. Each flower contains ten yellow stamens and five styles at the centre. Flowers appear from April through August across most of the range (and as early as December in California). The plant is self-fertile and is pollinated by flies and small bees.

Three subspecies of Cerastium arvense are recognised: subsp. arvense (the typical form), subsp. strictum, and subsp. suffruticosum. The species is closely related to the native North American Cerastium strictum, from which it is distinguished by its larger petals and longer reproductive stems.

Cerastium arvense is exclusively an outdoor plant. It grows naturally across Europe, North America, and parts of South America in grasslands, rocky outcrops, dry banks, roadsides, meadows, and disturbed sites. In California it is considered native; in the northeastern United States it is introduced but well established. It performs best in full sun on well-drained, sandy or calcareous soils and cannot tolerate shade. It works well as a ground cover for difficult, dry spots.

Cerastium arvense is a ground-covering perennial that is not typically grown in containers. Division in spring is the recommended method for managing or rejuvenating established plants — the prostrate shoots root freely as they spread, making it easy to detach and replant rooted sections.

Cerastium arvense can be propagated by seed or by division. Seeds are best sown in spring in a cold frame and transplanted when seedlings are large enough to handle. Division is straightforward in spring, since the prostrate shoots root freely as they spread, making it easy to detach and replant rooted sections. The plant is self-fertile and pollinated by flies and small bees.

Cerastium arvense is self-fertile and pollinated by flies and small bees. Each flower bears ten stamens and five styles. The white, deeply bilobate petals provide a clear landing platform for small pollinators.

Cerastium arvense has an edibility rating of 0 out of 5 from PFAF — no known edible uses are recorded. Traditional ethnobotanical records (SEINet) note that it was used medicinally by indigenous peoples (as an aid in childbirth, an astringent, and for treating injuries), but no culinary use is documented.

Cerastium arvense has a medicinal rating of 1 out of 5 (PFAF). Historical uses include an astringent decoction applied for the treatment of injuries and miscarriage. Traditional Native American ethnobotanical records (SEINet) note it was used as an aid to women in childbirth to stop bleeding and as an astringent for injuries. These uses are historical and no modern clinical evidence is cited in the available sources.

No known other uses (such as for dye, fibre, timber, or industrial applications) are documented for Cerastium arvense. PFAF records zero known other uses.

Even if you don't have a green thumb, you can successfully care for Mouse Ear Chickweed due to its easy-going nature.

Mouse Ear Chickweed grows vertically and new growth emerges from the top of the plant.

Mouse Ear Chickweed’s native range is Most of Europe, including Britain, south and east to N. Africa and temperate Asia..

Mouse Ear Chickweed should be watered regularly, allowing the soil to dry out between waterings.

Mouse Ear Chickweed loves a well-draining soil. Perlite and vermiculite help with drainage, while coco coir adds organic matter, so a good potting soil mix will have all three. You can improve store-bought soil by adding some perlite to it.

Mouse Ear Chickweed thrives in bright and direct sunlight. To ensure your plant receives enough light to survive, place it less than one foot from a window. The current weather in your area may affect the placement in your home. For example, if you live in a region that has longer and more intense periods of sunlight, then you may want to place the plant farther away from the window to avoid direct sunlight and reduce the risk of sunburn. Alternatively, if you live in a region with relatively milder temperatures and less intense sunlight, then you may be able to place the plant closer to the window for increased exposure. Ultimately, the current weather in your area should be taken into consideration when determining the best placement for your Field Mouse Ear.

Repotting the Mouse Ear Chickweed is necessary either when it has doubled in size or once every year, whichever happens first. With fresh potting soil replenished annually, the plant will receive all the necessary nutrients, rendering the use of fertilizer unnecessary. Keep in mind that the source of a plant's energy is the sun, not fertilizer.

The toxicity level of this plant has not been officially confirmed by Ploi. If there is a possibility of ingestion of plant material with an uncertain toxicity by you, a family member, or a pet, it is advisable to seek the assistance of a medical professional.