According to nature and garden experts, you should not mow the lawn in May. Instead, hobby gardeners should promote insect diversity in their own garden.
The German Horticultural Society 1822 e.V. (DGG) calls for a "mowing-free May" every year. More pollinating insects in the garden can also be an advantage for the orchard or flower bed. The proportion of nectar-rich flowers increases tenfold if you leave the lawnmower more often.