Why Is My Geranium Getting Leggy?

A leggy geranium — long, bare stems topped with a few leaves and barely any flowers — is one of the most common problems growers face by midsummer. What started as a neat, bushy plant in spring can look like a tangled mess by August. The causes are predictable, and so is the solution. Understanding why legginess happens puts you firmly in control of the plant's shape.

Low Light Causes Stretching

The primary driver of leggy growth is insufficient light. When a plant does not receive enough direct sun, it stretches its internodes — the stem sections between leaf nodes — in an effort to reach brighter conditions. This produces the long, spindly stems with wide gaps between leaves that look unattractive and flower poorly. Moving the plant to a sunnier position is the first step, but the stretched stems will not shorten on their own. You need to cut the plant back as well.

Lack of Pinching Through the Season

Pelargoniums naturally grow outward from the tips of their stems. If you never remove those growing tips, the plant produces one long stem per shoot rather than branching. Pinching — snapping or cutting off the top centimetre or two of each shoot — forces two or more side shoots to form at the pinch point, doubling the branching. Do this from early spring through to early summer on every shoot that has grown four or more leaf nodes. The result is a dense, multi-stemmed plant rather than a few long wands.

Cutting Back an Already Leggy Plant

If the plant is already leggy, pinching the tips will not help much — the long bare stems remain. Instead, cut back each stem to a point where there are still healthy leaves, ideally to just above a leaf node or a visible side shoot bud. You can cut pelargoniums back by up to half their height without harming them. Water lightly after cutting, apply a balanced liquid feed, and place in full sun. New side growth usually appears within two to three weeks.

Old Woody Stems

Pelargoniums grown for multiple years develop woody, bark-covered stems at their base. These lower sections rarely produce new leaves, which makes the plant look especially bare and leggy. In late winter or very early spring, cut the plant back hard — down to within 10–15 cm of the base, leaving a few nodes on each main stem. This hard rejuvenation prune triggers vigorous fresh growth from the old wood and resets the plant to a compact shape. Follow with fresh compost and regular feeding once new growth is established.

Hardy Geraniums That Sprawl

Hardy cranesbills can also become leggy, particularly after their first flush of flowers in early summer. Cutting the whole clump back by two-thirds with shears after flowering — known as the Chelsea chop — encourages a neat mound of fresh foliage and often a second flush of blooms in late summer. This annual cut prevents the sprawling, open habit that develops when cranesbills are left unpruned.