Frithy and Chadacre Woods is a 28.7-hectare (71-acre) biological Site of Special Scientific Interest (SSSI) in the parishes of Lawshall and Shimpling in Suffolk, England.

[3] All three woods are of the wet ash (Fraxinus excelsior) / maple (Acer campestre) type, with hazel (Corylus avellana) also present in considerable quantity.

There are pedunculate oak (Quercus robur) trees and other tree and shrub species include aspen (Populus tremula), wild cherry (Prunus avium), midland hawthorn (Crataegus laevigata), hornbeam (Carpinus betulus), crab apple (Malus sylvestris), holly (Ilex aquifolium), spindle (Euonymus europaeus) and common dogwood (Cornus sanguinea).

There are many other woodland floor plants including early purple orchid (Orchis mascula), twayblade (Neottia ovata), gromwell (Lithospermum officinale) and bluebell (Hyacinthoides non-scriptus).

[4] There are several well-vegetated rides in the group of woods that support a mixture of woodland and meadow plant species and which attract considerable numbers of common butterflies.