Fourteen species of orchid are known to grow at the reserve including some of the UK's rarest species. Park Gate Down is one of only three sites in the UK for the nationally rare monkey orchid (Ochis simia).
A total of fourteen orchid species can be found growing at the nature preserve, including a few of the UK's most endangered varieties. The park's unique location makes it home to just one of only three sites in the country where the rare monkey orchid (Ochis simia) can be discovered.