Colmworth has a roadside nature reserve between Bushmead Cross and the northern entrance to the village on Little Staughton Road.  The grid reference is TL110595.  It is designated by a wooden marker post just opposite a field entrance to the north and finishes at the brook to the south.  There are Pyramidal Orchids just down the hill from the marker post and Sulphur Clover is also present in the reserve.

Map of roadside nature reserve

Pyramidal orchid