Wasps in the garden: Why they are helpful allies rather than pests

Key points at a glance

• Only two of the hundreds of native wasp species (the Common wasp and the German wasp) are interested in human food.
• As insect hunters, wasps regulate populations of caterpillars, flies and aphids in your garden.
• The mountain paper wasp (Polistes biglumis) is peaceful and shows no interest in your coffee table.
• Observe wasps on flowers as pollinators and participants in a stable food web.

Why wasps are an indispensable part of your garden

Activity among social wasps reaches its peak in July. Many gardeners associate the yellow-and-black buzzing with an immediate nuisance at the dining table. From a biological perspective, however, this perception is one-sided: the vast majority of wasp species native to the DACH region are not food scavengers; instead, they make a massive contribution to ecological pest control as predators.

The species perceived as annoying – the Common wasp (Vespula vulgaris) and the German wasp (Vespula germanica) – form large colonies. Only they develop a high demand for readily available sugars in late summer to meet their massive energy requirements. The rest of the enormous variety of solitary and smaller social wasps remain completely unimpressed by your cake.

The ecological role of wasps

Wasps perform two essential functions in a wildlife-friendly garden: they act as pollinators and as predatory regulators. While bees (Apoidea) are known for their specialised pollen-collecting hairs, wasps (Vespidae) primarily visit umbellifers (Apiaceae) and open flower structures, as their mouthparts are often unsuitable for deeper flower shapes. In doing so, they transfer pollen and promote genetic exchange among wild plants.

However, wasps require protein for their brood. In doing so, they perform valuable work by decimating organisms that are sometimes perceived as competition in the garden:

Guidelines for dealing with wasps

1. Identify instead of panicking: Get to know the mountain paper wasp (Polistes biglumis). Their long legs, which dangle during flight, and their slender bodies make them look quite different from the robust Vespula species.
2. Tolerate nesting sites: If you discover a paper wasp nest, leave it where it is. As these nests are usually small and the insects react extremely peacefully when away from the nest area, they pose no danger to you.
3. Diversify food sources: Plant native umbellifers like hogweed (Heracleum sphondylium) or ground elder (Aegopodium podagraria) to attract wasps as pollinators and keep them away from your seating area.
4. Behaviour at the table: Avoid sudden movements. These are interpreted by the insects as a threat and trigger defensive reflexes. Cover food when you are sitting outdoors.
5. Avoid biocides: Do not use insecticides. These destroy the entire insect population, including the hunters that do the hard work of pest control for you.

By accepting wasps as specialised hunters and pollinators in your garden, you strengthen the biological resilience of your private ecosystem. A garden that provides a habitat for solitary digger wasps, spider wasps and potter wasps shows a healthy, intact food web.

Frequently asked questions

Why do wasps fly onto my cake plate?

Only the Common and German wasp seek out sugar sources as social species in late summer. Most other wasp species ignore human food.

Are paper wasps dangerous?

No, the mountain paper wasp is peaceful and shows no interest in human food. It only stings in defence if the nest is heavily disturbed.