Growing Hardy Geraniums (Cranesbill): A Perennial Guide

Growing Geranium (Cranesbill)

Pronunciation: jer-ay'nee-um

Hardy geraniums, or cranesbills, are versatile perennials that form low mounds of deeply lobed foliage topped with saucer-shaped flowers in true blues, purples, pinks, and whites. Unlike tender Pelargoniums, these tough plants thrive in zones 4–8 and offer months of bloom with minimal fuss.

Light, Water, and Soil

In the North, full sun to light shade works well; in the South, provide afternoon shade. They adapt to average, well-drained soil with a slightly acidic to neutral pH. Once established, most tolerate brief drought, though G. sanguineum varieties are especially drought-tolerant. Water regularly during dry spells for best performance.

Fertilizing and Maintenance

Apply a light handful of balanced granular fertilizer (10-10-10) in early spring. After the first flush of bloom (except for G. macrorrhizum and G. sanguineum), shear plants back to 2–3 inches to encourage fresh foliage and potential rebloom. Divide rarely—only when centers die out—in spring or early fall.

Companions and Seasonal Care

Pair with catmint, lilies, gas plant, delphinium, and Shasta daisies. In autumn, cut back after hard frosts. A winter mulch in cold zones prevents heaving. Follow a simple calendar: fertilize early spring, stake taller varieties mid-spring, groom in summer, and clean up in fall.