Are butterflies rarer in July? Find out why the change in species is natural and how you can boost biodiversity in your garden with targeted measures.
In July, many garden owners notice a decline in the butterfly population. This often leads to the mistaken assumption that one's garden habitat has become less biologically valuable. In fact, it is a natural process: some butterfly species have finished their first flight phase, while others are still in the stages of metamorphosis (transformation). The development from egg to caterpillar to chrysalis often takes place hidden within the herbaceous layer or on specialised food plants.
Furthermore, thermals influence behaviour. During periods of strong sunlight and midday heat, butterflies reduce their flight activity to minimise evaporation and conserve energy. They seek shelter in shaded undergrowth or dense vegetation. A perceived lack of butterflies is therefore often a result of observing at the wrong times.
While the early summer species population declines, the flight season for specific species begins in midsummer. These use the now-flowering structures of your garden, provided that the food supply for their caterpillars was already secured in the spring.
| Species | Common Name | Special Requirements |
|---|---|---|
| Argynnis paphia | Silver-washed Fritillary | Locations near forest edges, violets as caterpillar food |
| Maniola jurtina | Meadow Brown | Extensive meadows, grasses for larvae |
| Aphantopus hyperantus | Ringlet | Drier or damp edges, tolerates partial shade |
To promote biodiversity in the long term, avoiding synthetic fertilisers and chemical pesticides is essential. These not only damage the target organisms but also impair the entire soil biology. Instead, rely on mechanical methods and promote the ecological balance through site-appropriate, native plants.
No. Faded perennials provide seeds for birds and shelter for insects. Additionally, many insects use the stems as winter quarters.
During extreme heat, many butterflies fly less to save energy. They retreat into the shade and only become active again in the evening.
All species data comes from scientific sources (CC BY 4.0 / CC0). Attribution according to licence terms. Complete source overview →