By observing insects, we learn a lot about their way of life: insects called pests are eaten by other insects that we call auxiliaries. Pollinators that pollinate the flowers are essential for the reproduction of many plants and more generally for the preservation of plant species. Wood-eating insects eat and transform dead plant and animal matter, and contribute to soil fertility. Their galleries allow the penetration of water and air, essential to the roots.

To promote the biodiversity of the garden and attract beneficial insects, an insect shelter has been installed. Facing south-east, this shelter facilitates their winter survival or the laying in summer of several species. It is built with douglas pine, and is composed of several compartments filled with elements serving as a refuge for the various auxiliaries. Chemicals, when used in gardens also destroy the insects and their habitats and endanger the natural regulation formed by the food chain.