10 Common Garden Insects in the UK

Whether you tend a small urban plot or a large country garden, certain insects appear year after year. Knowing which species are beneficial and which are potential pests helps you work with nature rather than against it. Here are the ten insects you are most likely to encounter in a British garden.

1. 7-Spot Ladybird

Coccinella septempunctata — Britain's most familiar beetle. Bright red with seven black spots. Both adults and larvae are voracious aphid predators, consuming up to 5,000 aphids in a lifetime. Completely beneficial.

2. Common Carder Bee

Bombus pascuorum — a ginger-brown bumblebee found in gardens from March to November, one of the latest bumblebees to be active in autumn. Nests in grass tussocks, old mouse holes, and bird boxes. An excellent pollinator of runner beans, tomatoes, and wildflowers.

3. Marmalade Hoverfly

Episyrphus balteatus — slender, orange-and-black hoverfly often seen hovering near flower beds. Adults feed on nectar (important pollinator). Larvae eat aphids — a single larva can consume 400 aphids before pupating. Harmless — it has no sting.

4. Green Aphid

Myzus persicae and related species — tiny, soft-bodied sap-suckers found clustering on new shoots, buds, and leaf undersides. Aphids reproduce astonishingly fast — a single female can produce 80 offspring in a week during summer. They weaken plants and spread viruses but are food for ladybirds, hoverfly larvae, and lacewings.

5. Large White Butterfly

Pieris brassicae — the “cabbage white.” Adults are beautiful garden visitors, but their caterpillars can devastate brassicas (cabbage, kale, broccoli). Eggs are laid in clusters on the underside of leaves. Caterpillars are yellow-green with black markings. Net vulnerable crops to prevent egg-laying.

6. Garden Spider

Not technically an insect (arachnid), but so common it deserves mention. Araneus diadematus builds the classic orb web seen glistening in autumn morning dew. Entirely beneficial — catches flies, mosquitoes, and other insects.

7. Common Earwig

Forficula auricularia — brown, elongated insect with distinctive pincers (cerci) at the rear. Active at night. Earwigs are omnivores — they eat aphids, mites, and insect eggs (beneficial) but also occasionally nibble flower petals and soft fruit. Overall, they do more good than harm in most gardens.

8. Black Garden Ant

Lasius niger — the ubiquitous ant that nests under paving stones, in lawns, and at the base of walls. Colonies can contain 15,000 workers. Flying ant day occurs in warm, humid weather in July–August when males and queens take to the air for mating flights. Ants aerate soil but also “farm” aphids for honeydew.

9. Common Blue Damselfly

Enallagma cyathigerum — if your garden has a pond, you will likely see these delicate, electric-blue damselflies from May to September. Nymphs live underwater for 1–2 years, predating mosquito larvae and other small aquatic organisms. Adults catch midges and small flies on the wing.

10. Rose Chafer Beetle

Cetonia aurata — a spectacular metallic green beetle found on roses, elder flowers, and other blooms in May–July. Adults feed on pollen and are clumsy fliers. Larvae live in compost heaps and rotting wood, helping to break down organic matter. Despite occasional concern about flower damage, rose chafers are generally harmless.