How to grow hardy geraniums

Looking for pelargonium geraniums? See our geraniums Grow Guide.

How to grow hardy geraniums

Grow hardy geraniums in moist but well-drained soil in sun or shade. Cut back after flowering to encourage a second flush of blooms. Hardy geraniums die back in autumn and regrow in spring. Mulching annually with leaf mould or well-rotted compost or horse manure will keep plants growing well for several years.

Growing hardy geraniums: jump links

• Planting hardy geraniums
• Caring for hardy geraniums
• Propagating hardy geraniums
• Where to buy hardy geraniums
• 10 hardy geraniums to grow

Follow our detailed advice on growing hardy geraniums, below.

Where to grow hardy geraniums

Most hardy geraniums thrive in light shade, whilst the smaller alpine types do best in full sun. Hardy geraniums can cope with any soil type and some, such as Geranium sylvaticum and its cultivars, can cope with very dry conditions.

Hardy geraniums can be great self-seeders and plants will often grow in tiny cracks in paving, proving how tough they are.

How to grow hardy geraniums

Hardy geraniums are often bought potted but they can also be purchased online as bare-root plants. If buying bare-root geraniums, pot them up as soon as they arrive, and then plant them out a few weeks later, when they've put on growth. There's no need to improve soil unless it’s very poor.

Caring for hardy geraniums

Hardy geraniums need very little care. They’re not targeted by rabbits, and slugs and snails will eat other plants in preference. They can be cut back right to the ground after their first flush of flowers and will produce fresh foliage and more flowers in the same summer. Some hardy geraniums offer attractive autumn foliage, so resist the urge to cut back too quickly after flowering.

Watch our No Fuss video guide to cutting back hardy geraniums, featuring Rosie Yeomans:

Propagating hardy geraniums

There is seldom a need to propagate hardy geraniums as seedlings are easily lifted and potted up from the garden. Plants can be lifted and divided in spring. Growing hardy geraniums from seed can be tricky and long-winded.

Growing hardy geraniums: problem solving

Hardy geraniums are mostly trouble-free. However they can be attacked by the larvae of geranium sawfly (Ametastegia carpini). These look like tiny grey caterpillars, around 12mm long. They munch holes in the leaves, leaving an unsightly, lace-like appearance. The more hardy geraniums you have in your garden, the more likely they are to breed.

The larvae can be hard to spot, as they drop off the leaves when the plant is disturbed. They are mostly active in May and September; the September generation pupates in the soil and overwinters, emerging in spring to lay eggs on the foliage. Although the damage can be very unsightly, it rarely weakens the vigour of the plant. The following actions might help to keep them under control:

• The larvae of many geranium sawfly overwinter in the soil, so cultivating the ground beneath susceptible plants by clearing debris and lightly raking the soil will expose the larvae to be killed by frost, and to be eaten by birds and other predators
• Check the undersides of leaves carefully from May onwards for signs of the eggs and larvae and remove by hand if possible, to avoid numbers building up

The best hardy geraniums to grow

Geranium x oxonianum

Geranium x oxonianum f. thurstonianum bears single to double, pink-purple flowers with very narrow petals. It’s perfect for growing at the front of a mixed herbaceous border, or at the base of shrubs such as roses.

H x S: 50cm x 70cm.

• Buy Geranium x oxonianum f. thurstonianum ‘Southcombe Star’ from The Hardy Geranium Nursery

Geranium sanguineum var. striatum

Geranium sanguineum var. striatum is a compact, very low-growing geranium, which bears masses of pale pink, veined flowers in contrast with dark green foliage. It’s perfect for growing at the front of a mixed herbaceous border, or in containers on the patio.

H x S: 10cm x 30cm.

• Buy Geranium sanguineum var. striatum from Thompson & Morgan

Geranium ‘Patricia’

Black-centred, bright-purple flowers of hardy geranium Geranium ‘Patricia’ bears bright purple flowers with black centres over a low-growing mound of dark green leaves. Leaves turn a fantastic shade of red in autumn.

H x S: 60cm x 45cm.

• Buy Geranium 'Patricia' from Crocus

Geranium cinereum 'Giuseppe'

Geranium cinereum 'Giuseppe' is a compact variety that remains as a neat cushion. From early to late summer the plants are covered with half inch-wide, bowl-shaped magenta flowers.

H x S: 30cm x 30cm.

• Buy Geranium cinereum 'Giuseppe' from J Parker's

Geranium ‘Max Frei’

Geranium ‘Max Frei’ bears bright pink, veined flowers on hairy stems, from June to August. Grow it at the front of a mixed herbaceous border, and deadhead spent blooms regularly to prolong flowering.

H x S: 40cm x 35cm.

• Buy Geranium 'Max Frei' from Claire Austin

Geranium 'Rozanne'

Named after nurserywoman Rozanne Waterer who discovered this attractive hardy geranium with her husband Donald, Geranium 'Rozanne' bears large violet-blue flowers with white centres and grey anthers, for months on end.

H x S: 30cm x 60cm.

• Buy Geranium 'Rozanne' from Thompson & Morgan

Geranium x magnificum

Geranium x magnificum produces a glorious show of rich violet-blue flowers in mid-summer. The Royal Horticultural Society have given their prestigious Award of Garden Merit (AGM).

H x S: 60cm x 90cm.

• Buy Geranium x magnificum from Thompson & Morgan

Geranium 'Spessart'

A pink-flowered plant is sometimes sold under the name 'Spessart' but the true plant has white flowers. It makes a useful ground cover plant for dry, shady areas, producing a dense mat of aromatic leaves, which take on rich autumn tints.

H x S: 50cm x 60cm.

• Buy Geranium ‘Spessart’ from The Hardy Geranium Nursery

Geranium maderense

Geranium maderense is the largest of the geranium species, reaching a lofty 1.5m in height. Although perennial, it often acts as a biennial, producing pretty magenta pink blooms in its second year.

H x S: 100cm x 150cm.

• Buy Geranium maderense from Thompson & Morgan