 A wide range of typical chalk downland specialists are found at Ham Hill including clustered bellflower ("Campanula glomerata"), autumn gentian ("gentianella amarella"), chalk milkwort ("Polygala vulgaris"), horseshoe vetch ("Hippocrepis comosa") and common rockrose ("Helianthemum nummularium").Both clustered bellflower ("Campanula glomerata" and autumn gentian ("gentianella amarella") are abundant.This is one of only two confirmed sites in Wiltshire for musk orchid ("Herminium monorchis").