Thyme-leaved sandwort
Arenaria serpyllifolia
Thyme-leaved sandwort is an annual or biennial herbaceous plant reaching heights of 2 to 20 centimeters. It is characterized by opposite, ovate, and pointed leaves that visually resemble those of thyme. The tiny, five-petaled white flowers appear in loose cymes and bloom between May and September. The plant is a typical pioneer colonizer on dry, sandy, or stony soils such as nutrient-poor grasslands, fields, and railway embankments.
Details
Habitat function
Provides habitat for specialized small invertebrates in sparse vegetation.
Nutrient uptake
Very efficient uptake of small amounts of nutrients from barren soils.
Food source for
Small wild bees, hoverflies, and beetles.
Human use
No significant economic or medicinal use known; occasionally found in rock gardens.
Ecology
Ecological role
Pioneer plant that colonizes open ground and helps prevent erosion; serves as a food source for small insects.
Natural predators
Insect larvae and various specialized weevil species.
Competitor species
Grasses and ruderal tall herbs as soil nutrient enrichment increases.
Ecosystem service
Soil stabilization in dry habitats and supporting biodiversity by providing food for insects.
Threats
Agricultural intensification, eutrophication, and the loss of open sand and gravel areas.
Scientific profile
Profile
Reproduction
Exclusively generative via seeds; the plant produces numerous small, kidney-shaped seeds within a capsule fruit.
Protection & threats
Main threats
Eutrophication through nitrogen deposition, abandonment of grazing (scrub encroachment), soil sealing, and intensive agricultural use of marginal land.