Trampling plea for early bluebells
13 April 2011 Last updated at 09:46 BST
Bluebells have bloomed two weeks earlier than normal because of the warm weather.
But walkers have been asked to watch where they put their feet because of the risk of trampling the flowers.
Brian Eversham from the Wildlife Trust joined the BBC's Mike Cartwright in Gamlingay Wood in Cambridgeshire and said that treading on the flowers could damage generations of plants.