From late winter through to early summer, heathland, common land and coastal cliff paths across Britain flare with yellow blossom. Two shrubs are almost always responsible, and beginners often assume both are gorse. They are not. Telling gorse from broom takes only a few seconds once you know which clues to check, and the effort pays off because each plant tells you something different about the soil, the grazing history and the season around you.
Both are members of the pea family, both are woody shrubs, both carry yellow flowers along their branches, and both turn up on the same stretches of acidic heath and rough grassland. At a distance, in flat afternoon light, a mass of yellow on a hillside could easily be either. The good news is that the reliable differences are structural rather than subtle: once you get within touching distance, you will never mix them up again.
This is the single most useful check, and it works all year round.
If in doubt, look at the youngest growth at the tip of a shoot. Gorse shows spines even there. Broom shows soft green angles.
Broom produces small three-lobed leaves, known as trifoliate leaves, on its lower stems in spring, but these drop early and are often missing from flowering shoots. That gives broom its airy, almost bare appearance.
Gorse leaves are tiny, dark green and spine-like, and are only really visible on very young growth. The flowers are pea-shaped in both species, but they differ in the details. Gorse flowers are roughly 1.5 to 2 centimetres long, grow in clusters close against the spines, and sit inside a distinctive velvety brown two-lipped calyx. Broom flowers are larger, up to 2.5 centimetres, held on noticeably longer stalks, usually singly or in pairs, and are a deeper, richer yellow — occasionally with a smear of red or orange on the wings.
Later in the season, check the seed pods. Broom pods are flat and black with hairy edges. Gorse pods are dark brown, densely furry, and split open with an audible crack on a hot day, flinging seed some distance.
Scent is the quickest confirmatory clue on a warm, still afternoon. Common gorse carries a strong coconut and vanilla fragrance, sometimes likened to almond, that hangs over a whole hillside. Broom's scent is far fainter and sweeter — pleasant, but nothing like coconut, and easy to miss entirely.
Timing helps too. Common gorse flowers mainly from March to June, with a second flush in autumn, giving rise to the old saying that when gorse is out of bloom, kissing is out of fashion. Western gorse peaks in late summer, and dwarf gorse follows in midsummer. Broom is more of a one-act plant, flowering chiefly from May to June, and it looks at its best just as the main gorse flush begins to ease.
Gorse is the tough, sprawling evergreen of lowland heath, coastal slopes, railway banks and poor pasture. It tolerates grazing, cutting and thin, acidic soils, forms dense impenetrable clumps, and can reach two metres or more with age. Its wood burns fiercely and hot, which is why it was traditionally used to fire bread ovens.
Broom is taller, more upright and springy, reaching one to three metres, with a looser, brush-like outline. It prefers lighter, well-drained sandy or gravelly soils, often on heath edges, woodland rides and embankments. It is relatively short-lived, typically declining after ten to fifteen years, and is often gradually swallowed by gorse where the two grow side by side.
Take a moment to compare a plant you are sure about with one you are not, and the differences will lock in quickly. Gloves on, nose working, and the yellow of a British heathland spring suddenly becomes far easier to read.
The Tawny Heath shares practical, down-to-earth guidance on british heathland and wildlife for readers across the UK.
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