Trees found here include hornbeam, hazel, beech, oak, birch and sweet chestnut. Brambles, bracken and bluebells are dominant on the woodland floor, but plants such as common spotted orchid, common centaury and St John’s wort are found in the woodland rides.
The Blean is home to many forest birds such as woodpeckers, tree creepers and nuthatch. Spotted flycatcher, nightjar, bullfinch and hawfinch are also seen here and there is an important population of nightingales. The golden oriole is a rare summer visitor.
The woods are one of the few areas in Britain that supports the heath fritillary butterfly and the scarce seven-spot ladybird can also be found here.