Bloody cranesbill
Also known as
Bloody geranium, Blood-red cranesbill, Hardy geranium, Cranesbill
Keep this plant’s care guide close at hand.
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Geranium sanguineum is a compact, rhizomatous perennial forming low mounds of finely divided, palmately lobed leaves that often flush crimson in autumn—hence the epithet “sanguineum.” From late spring into midsummer, abundant five-petaled flowers open vivid magenta to purplish pink, usually with darker veining and a pale eye, drawing bees and hoverflies. Plants reach 20–30 cm tall and 30–45 cm wide, weaving neatly among stones and edging for durable, noninvasive groundcover. Native to calcareous and rocky habitats, it thrives in well-drained, moderately fertile soils and shows notable drought tolerance once established. Compared with tender “geraniums” (Pelargonium), this true hardy geranium is frost-proof and reliably perennial. Foliage is semi-evergreen in mild winters, and clumps are typically unbothered by deer and rabbits. Minimal care—deadheading or a light shear after peak bloom—refreshes the plant and can prompt a lighter rebloom. Its tidy habit, seasonal leaf color, and resilience make it excellent for rock gardens, slopes, cottage borders, and coastal plantings.
Taxonomy
Properties & Requirements
How to care for Bloody cranesbill
Water
Water deeply but infrequently. During the first growing season, supply about 2.5 cm (1 in) of water weekly if rainfall is lacking, allowing the top 3–5 cm of soil to dry between waterings. Once established, it tolerates brief drought; water during extended hot, dry spells to maintain bloom. Containers dry faster—check twice weekly. Always avoid waterlogged conditions, especially in winter; good drainage is essential. Mulch lightly to conserve moisture without smothering crowns.
Light
Full sun to light shade. For heaviest flowering and tight habit, provide at least 6 hours of direct sun in cool to mild climates. In hotter regions, morning sun with dappled afternoon shade prevents leaf scorch and prolongs bloom. Plants tolerate partial shade, especially on alkaline, thin soils, but flowering will diminish and stems may sprawl. Indoors it is not suited as a houseplant; grow outdoors in bright exposures.
Nutrients
In average garden soils, Geranium sanguineum needs little feeding. At planting, mix in 2–5 cm of compost to improve structure and trace nutrients. In spring, apply a light dressing of compost or a slow-release, balanced fertilizer at half rate (for example 5-10-10 or 10-10-10). Avoid high nitrogen formulations that spur soft, floppy growth. Container plants benefit from a half-strength balanced liquid feed monthly in spring to early summer. Do not fertilize in late summer or fall in cold climates.
Temperature
Exceptionally cold-hardy, performing in USDA Zones 3–8 (to Zone 9 with excellent drainage). Mature plants withstand temperatures to roughly −34 °C (−30 °F). Summer heat is tolerated where nights cool and soil drains freely; in hot, humid climates, provide afternoon shade and air circulation. Winter wet is more damaging than cold—keep soils on the dry side and avoid saucers under pots. Container plants benefit from shelter or heel-in protection during deep freezes.
