Beetles on wildflowers: Why you shouldn't remove them in July

Key takeaways

• Many beetles on your wildflowers are not pests, but beneficial pollinators and residents of an intact food web.
• Plants like wild carrot (Daucus carota) serve as central meeting points for insects in summer.
• The presence of beetles, spiders, and bugs on a plant is direct evidence of high biological diversity in your garden.
• Avoid chemical products so as not to disrupt the complex ecological relationships in your garden.

Why your flowers are becoming insect hotspots right now

In high summer, especially in July, you can observe high activity on native wild plants. If you see beetles on umbellifers or knapweeds (Centaurea), this does not indicate an infestation, but rather a functioning ecosystem. Many beetle species use the flower heads as a central hub for feeding, finding a mate, or as a lookout point to hunt other insects.

The unique structure of flowers, such as those found on wild carrot (Daucus carota), provides an ideal landing pad for a wide variety of insect groups due to the arrangement of many small individual florets. This open structure allows beetles, hoverflies, and wild bees to efficiently access pollen and nectar.

The ecological dynamics of the plant

A single plant forms a small, self-sustaining food web in the summer. The flowers initially attract pollinators. This concentration of insects in turn attracts specialised hunters such as crab spiders (Thomisidae) or assassin bugs (Reduviidae). These hunters use the flower as a hunting ground because they find a high density of prey there. This process is essential for the natural regulation of your garden ecosystem.

Comparison of ecological functions

How to promote diversity in your garden

For these processes to take place in your garden, a structure-rich design is necessary. Pay attention to the following measures:

1. Prefer native plants: Choose species like wild carrot (Daucus carota) or various knapweeds (Centaurea). These provide the necessary food source due to their flowering time and structure.
2. Maintain structures: Do not remove wilted stems immediately. The hollow stems of wild carrot serve as winter quarters for numerous insects after the growing season.
3. No pesticides: It is imperative to avoid insecticides and herbicides so as not to interrupt the delicate predator-prey relationships.
4. Stagger flowering periods: Ensure a continuous supply from spring to late autumn by selecting a variety of different plants.

Observing these insect concentrations is a sign of a vibrant garden. Instead of intervening, it is ecologically more valuable to watch what is happening and allow the natural development of the populations.

Frequently asked questions

Will the beetles eat my plants bare?

Generally, no. Most of the beetles you see on flowers in July use them as a source of nectar and pollen or as a meeting point.

Should I control the beetles?

No. A high beetle population indicates good ecological diversity and a functioning food web. Avoid insecticides entirely.