Grasshoppers in the garden: Why they suddenly become active in July

Key points at a glance

• The sudden midsummer appearance of grasshoppers is due to them completing their development into adults, not a mass migration.
• Grasshoppers (Orthoptera) need structurally diverse habitats with varied vegetation height and unmown long grass.
• A garden with a high number of grasshoppers becomes a reliable element of the food web for birds (Aves) and lizards (Lacertidae).
• Avoid mowing the entire lawn to protect larval stages and egg-laying sites.

Why your garden springs to life in July

If you walk through the garden in July and little creatures leap at every step, it signals a successful life cycle. Many gardeners assume their plot has been suddenly invaded. Biologically, however, this is a growth process unfolding over several weeks. Most native grasshopper species, such as the Great Green Bush-cricket (Tettigonia viridissima) and the Meadow Grasshopper (Chorthippus parallelus), emerge as wingless nymphs in spring.

These young insects are difficult to pick out against the ground because of their size and colouring, so they pass unnoticed. Only after their final moults in midsummer do they reach full size and develop complete wings. The chirping you hear now is a sign of sexual maturity: males rub their forewings or hind legs together (stridulation) to attract females and mark territory.

Habitat requirements and ecological significance

Grasshoppers are specialists of open-land structures. A closely mown ornamental lawn offers them little chance of survival. For their life cycle, they need a mosaic of:

• Xerothermic grassland (dry, warm, nutrient-poor meadows): Supplies the soil warmth necessary for egg development.
• Structurally rich margins: Provide cover from predators and a variety of native food plants.
• Bare soil patches: Essential, as many species lay their eggs directly into open ground.

How different habitats measure up

How to support grasshoppers sustainably

1. Mowing management: Never cut the entire meadow at once. Leave at least 30 to 50 per cent of the area as uncut grass strips throughout winter. This protects eggs that overwinter in stems or in the soil.
2. Avoid chemicals: Using pesticides destroys the very foundation of the food web. Grasshoppers themselves are prey for lizards and many insect-eating birds.
3. Location and microclimate: Ensure there are sunny, bare patches. Here grasshoppers can bask, regulating their body temperature—a vital part of their metabolism.
4. Plant selection: Rely exclusively on native wild plants. They supply the specific diet that native grasshopper species require for development.

By maintaining these ecological niches in your garden, you create a stable system that goes far beyond simply watching these jumping insects.

Frequently Asked Questions

Why do I only notice grasshoppers in July?

They have been present as tiny nymphs since spring, but their camouflage and small size keep them hidden until they become fully grown adults.

Does frequent mowing harm grasshoppers?

Yes, it destroys their food supply and egg-laying sites, and removes the necessary shelter for both nymphs and adult grasshoppers.