Why do we need to change the way we manage urban grass? Although uniformly short grass used to be seen as a sign of good management, people now are becoming more aware of the value of nature and the need for more nature-friendly management techniques. Frequent mowing removes flowers that provide nectar for bees and butterflies. It removes the eggs that butterflies lay on grass stems, crushes caterpillars and other insect larvae, and can kill or injure other wildlife such as frogs, snakes and voles. Our guidance booklet outlines Best Practice for managing these spaces.