The homestead Charlottendal on the north-eastern corner of the lake is surrounded by old agricultural lands where inorganic fertilisers and pesticides have never been used, and, as a consequence, contains many rare species, such as Common Rockrose, Dithering-grass, Scarlet Waxy Cap.
Blue moor-grass, Sesleria albicans, a characteristic plant of such grassland, is present but not abundant in the primary grassland on the hill slopes, where herbs such as rock-rose, Helianthemum nummularium, are more common; blue moor-grass is more plentiful in the secondary grassland on the quarry floor and spoil heaps, where it is associated with species such as quaking grass, Briza media, salad burnet, Sanguisorba minor, and autumn gentian, Gentianella amarella.