Situated on the Chiltern escarpment, this reserve supports splendid wildflowers and over twenty-five species of butterfly.
Aldbury Nowers comprises two areas of hillside linked by The Ridgeway. The warm south-facing slopes host the small but beautiful flowers of chalk grassland including common milkwort, common rock rose, clustered bellflower and lady's bedstraw. The reserve is one of the finest butterfly habitats in Hertfordshire with Essex skippers, marbled whites, green hairstreak, brown argus, and the scarce grizzled and dingy skippers. It is also very good for other invertebrates such as solitary bees and wasps.