How to grow geranium cranesbill
Overview
Geranium sanguineum, commonly called cranesbill, is a clump-forming herbaceous perennial grown for its finely divided foliage and saucer-shaped pink flowers. It thrives in part shade with moderate moisture and is valued as a reliable groundcover or filler in mixed borders.
Varieties
- Geranium sanguineum var. striatum — A compact form with pale pink flowers veined in deeper pink, ideal for rockeries.
- Geranium sanguineum 'Album' — Pure white flowers on a low-growing mound, excellent for brightening shady spots.
- Geranium sanguineum 'Max Frei' — A vigorous, free-flowering selection with magenta-pink blooms and a long season.
Soil Preparation
Prefers a neutral to slightly alkaline pH (6.5–7.5) and well-drained loam or sandy soil. If soil is heavy clay, amend with coarse sand and compost to improve drainage. Avoid waterlogged sites.
Growing Guide
Plant in well-drained soil enriched with organic matter, in a position that receives morning sun and afternoon shade. Space 30–40 cm apart to allow for spreading. Water regularly during the first growing season to establish a deep root system; once established, it is moderately drought-tolerant. Mulch in spring to retain moisture and suppress weeds. Cut back after flowering to encourage a second flush of blooms.
Sowing
Sow seeds 3 mm deep in seed trays of moist seed-raising mix in autumn or spring. Germination takes 14–21 days at 15–20°C. Transplant seedlings when 5–10 cm tall. Direct sowing is less reliable; best results come from nursery-raised plants or division.
Care
Feed with a balanced slow-release fertiliser in early spring. After the main flowering flush, cut back spent stems to the base to promote fresh foliage and a possible second bloom. Divide clumps every 3–4 years in autumn to maintain vigour and prevent centre dieback.
Companion Planting
Pairs well with roses, lavender, and catmint for a cottage-garden look. Avoid planting near aggressive spreaders like mint or bamboo, which can outcompete its shallow roots.
Common Pests & Risks
Watch for slugs and snails on young growth in damp conditions; control with iron-based pellets or beer traps. Aphids may appear on new shoots but rarely cause significant damage; hose off or treat with insecticidal soap if needed.
Troubleshooting
Yellowing leaves: overwatering or poor drainage; reduce watering and improve soil. Brown leaf edges: too much direct sun or dry air; move to part shade. Leggy growth: insufficient light; relocate to a brighter spot. Powdery mildew: humid, still air; improve air circulation and avoid overhead watering. Centre dieback: old clumps need division; replant fresh divisions every 3–4 years.