Scrub is a transitional habitat where grassland and meadow changes into woodland. They typically contain shrubs, bushes and trees, as well as wildflowers and grasses. Being a margin between woodlands and meadow means scrubland forms part of the rich mosaic of habitats that make up Watchtree Nature Reserve. Due to the variable tree cover, the range of species can be extremely diverse with woodland, hedgerow and meadow/grassland species all present. This high level of biodiversity makes scrub a very important habitat. If left unmanaged or un-grazed, scrub will generally turn into woodland.