The larvae feed on Primula farinosa and Primula veris.

The site holds the largest known population of bird's-eye primrose, Primula farinosa, in County Durham.

Several rare and local species are present, including globeflower, Trollius europaeus, birds's-eye primrose, Primula farinosa, lesser club-moss, Selaginella selaginoides, and moonwort, Botrychium lunaria.

There is a small patch of the nationally scarce bird's-eye primrose, Primula farinosa, and one of the few records from lowland Durham of lesser clubmoss, Selaginella selaginoides, is from this site.

Primula farinosa, the bird's-eye primrose, is a small perennial plant in the family Primulaceae, native to northern Europe and northern Asia, and (rarely) farther south at high altitudes in the mountains of southern Europe.

The larvae feed on Alchemilla alpina, Anemone, Anthyllis vulneraria alpestris, Aster amellus, Centaurea jaceak, Cerastium, Globularia cordifolia, Leucanthemopsis alpine, Leucanthemum, Primula elatior, Primula farinosa, Ranunculus acris and Salix reticulata.