Sleeping wild bees in the garden: Why rest periods are important

Key points at a glance

• A motionless wild bee in a flower is usually just in a cold-induced resting phase and is not dead.
• Male wild bees use flower heads and dry plant stems as nightly sleeping spots, as they do not build their own nests.
• Spent perennials and dry plant structures in the garden are essential for the insects' survival.
• Avoid touching or providing sugar water to supposedly "dead" bees, as they will become active on their own once they warm up.

Why wild bees "sleep" in your garden

If you discover a wild bee in a flower in the early morning hours or during cool weather that remains completely motionless, this is a natural process. Wild bees are poikilothermic (cold-blooded) animals. This means their body temperature is directly dependent on their environment. If this drops, their metabolism slows down drastically to save energy.

We observe this behaviour particularly often in males. While females often return to their nests, males must find their sleeping place in the vegetation. They cling to flowers or stems with their legs or their mouthparts, known as mandibles, to brave the wind and weather. This behaviour serves as protection against cooling down and predators.

Sleeping spots in a nature-friendly garden

A garden rich in structure provides the necessary conditions for wild bees to spend their rest periods safely. While short-mown lawns are ecologically worthless, complex plant structures such as borders and old stems offer necessary refuges.

Overview of suitable sleeping structures

How to properly support wild bees

1. Do not interfere: If you find an animal that is not moving, observe it from a distance. As soon as the sun warms its body, the bee will begin grooming movements and fly away.
2. Preserve structure: Do not cut back your perennials completely in the autumn. Spent flower heads and hollow stems are vital sleeping and nesting sites for many species.
3. No artificial feeding: Refrain from providing sugar water or honey. This is unnecessary for resting insects and can make the animals' bodies sticky.
4. Plant flower diversity: Focus on native wild plants. These offer not only food but also ideal sleeping niches due to their different flower shapes.
5. Minimise light pollution: Avoid artificial lighting in the garden at night, as this disrupts the rhythm of insects and unnecessarily irritates them during their rest phase.

Observing a resting wild bee is a sign of a functioning habitat. By avoiding pesticides and leaving room for your garden to develop wildly, you create the foundation for species like the European orchard bee (Osmia cornuta) or the red mason bee (Osmia bicornis) to live out their natural rhythms undisturbed.

Frequently Asked Questions

Is a motionless wild bee dead?

Usually no. It is cold-blooded and uses flowers as a sleeping spot. In cool temperatures, its metabolism is slowed down. It will fly away on its own when it gets warmer.

Should I feed a seemingly lifeless bee?

No. Never feed it with sugar water or honey. This can make the wings sticky or harm the bee. Peace and warmth are the best help.

Why are spent perennials important in the garden?

They serve as nightly sleeping spots for wild bees, a hiding place from predators, and for many species, they later serve as nesting or overwintering structures.