There are just a few surviving spots of ancient grassland - for example the churchyard; verges at Gun's Lane and Steeplechase Drove; the banks of the Old West River; two fields on Long Drove and two fields at Bullocks Haste. Here relict grasses [such as narrow-leaved meadow grass (Poa angustifolia), yellow oat grass (Trisetum flavescens), etc and plants such as hounds tongue(cynoglossum officinale), knotted hedge parsley (Torilis nodosa), hoary ragwort (Senecio erucifolius), vetches) can be found.
Areas such as Top Moor and Histon Moor, once the trees had been removed and grazing started would quickly have developed acid soil and become heath with relevant floras possibly including heather and wild thyme. These heaths would have been ideal for snakes and lizards. Lizards were still living at Top Moor in the 1970's.
Older plantlife has been able to persist here and there where modern field edges coincided with the ancient headlands or banks of the pre-enclosure strip field patterns.