Empetrum nigrum (European Sibiria, North America)
Habit: A dwarf shrub like mats, 0-1-0.5 m tall, 0.4 m wide or more; prostrate, flatly extended, dense like a carpet, slow-growing.
Flowers: Dioecious, inconspicuous light pink or light crimson, end of April to June.
Fruits: Pea-size, shiny berries, changing colour in August, sweet/sour to bitter taste, edible in winter, not poisonous.
Leaves: Evergreen, needle-shaped, linear, like herbaceous heaths, shiny fresh green.
Roots: Flat roots, tolerates filling with loose substrates, especially sand.
Demands: Sun to light shade, likes cool to humid areas.
Soil: Fresh to moist, quite sensitive to long dry spells, acidic to slightly alkaline, prefers poor soil, likes all well drained peat, bog, sandy-humic or sandy-loamy substrates.
Hardiness: Zone 2