The scarp top still retains some rich ancient grassland fragments, especially where the slope begins to tip northwards. At least twenty-one old meadow species have been counted here and there are tiny fragments of heathy grassland. Many chalk loving species including wild flowering
marjoram, butterflies and insects frequent the area. There are also areas of
waxcap fungi, which include
meadow,
crimson and
scarlet waxcap, together with many smaller waxcap species and scatters of
earth tongues and clumps of
fairy club. In some years, the strange, yellow
bird’s-nest orchid has been found here as well as
frog and
bee orchids. As is the case over the entire Downs, the rich biodiversity is present where there is heavy grazing. Blackcap was once well-populated by
rabbits and hence the short grass used to be heavily grazed, but
myxomatosis has wreaked havoc on rabbit populations. The decline in rabbits has had knock on effects on the species that can live in the area. For example, the
grayling butterfly have not been seen there since the late 20th century. In order to keep the scrub under control, the
National Trust graze the top area using sheep and
Exmoor ponies for the tougher plants. However, the area and particularly the lower grasslands are still under-grazed, meaning much of the scarp slope between Blackcap and Mount Harry is still invaded by scrub. Consequently, grayling and other species that used to frequent this rich, biodiverse chalk downland area still have not returned despite
National Trust management and the lower slope pastures are separated from the crest by large thickets making access both along and up the slope difficult unless you're on a path == Surrounding area ==