Siberian bugloss
Also known as
False forget-me-not, Heartleaf brunnera, Largeleaf brunnera, Brunnera
Keep this plant’s care guide close at hand.
Get the appAbout Siberian bugloss
Brunnera macrophylla is a clump-forming, rhizomatous perennial prized for its heart-shaped, rough-textured leaves and delicate sprays of sky-blue, forget-me-not–like flowers in spring. Native to the cool, moist woodlands of the Caucasus, it thrives in shade gardens where soils remain evenly moist and rich in organic matter. Plants form tidy mounds 12–18 inches tall with a slightly wider spread; foliage persists through summer in cool climates, though it may scorch or slump in hot, dry conditions. Numerous cultivars offer silvered or variegated leaves that brighten low-light sites. Brunnera is a dependable groundcover or edging plant for woodland borders, underplantings of shrubs, and along shaded paths. It is generally deer and rabbit resistant due to its bristly leaves, and it supports early-season pollinators when few other shade perennials are in bloom. Minimal division is needed; undisturbed clumps often improve with age.
Taxonomy
Properties & Requirements
How to care for Siberian bugloss
Water
Aim for evenly moist, not waterlogged soil. Provide about 1 inch (25 mm) of water per week from rain or irrigation during the growing season, more during hot, dry spells. Water at the base in the morning to keep foliage dry and reduce disease. Mulch helps maintain moisture between waterings. Do not allow prolonged drought, especially in the first year; established clumps tolerate brief dryness but may wilt or scorch.
Light
Best in partial to full shade. Morning sun with afternoon shade is ideal; avoid strong midday or late-afternoon sun, which can scorch leaves, especially in warm climates. In dense shade, plants still perform but may flower less; silver/variegated cultivars benefit from bright, indirect light to develop leaf patterning. Filtered, dappled canopy light mimics its native woodland conditions.
Nutrients
Feed lightly. In early spring, top-dress with 1–2 inches of compost or leaf mold to improve moisture retention and soil life. Where soils are poor, apply a slow-release, balanced fertilizer at half rate once in spring after growth begins. Avoid high-nitrogen or frequent feeding, which can produce lush but floppy foliage and increase disease susceptibility. Mulch annually to maintain fertility and cool the root zone.
Temperature
Hardy in USDA Zones 3–8, Brunnera prefers cool conditions. Ideal growth occurs around 50–70°F (10–21°C). Foliage may scorch or slump in sustained heat above ~85°F (29°C), particularly with sun or dry soil; provide extra shade and moisture in hot climates. Winter-hardy to severe cold with mulch protecting the crown. Not suited to hot, arid regions without consistent moisture and shade.
