‘… under the mazzard orchards growing on the northern slope of the valley.’
According to the OED, mazzard is a ‘small, dark, sweet cherry of Devon origin’, the fruit or tree of a wild cherry, Prunus avium. It sounds perfect for making the Hungarian sour cherry strudel which they call ‘meggyes rétes’.
Source: Henry Williamson, Tarka the Otter: His joyful water-life and death in the two rivers, illus. C.F. Tunnicliffe (Harmondsworth: Puffin Books, 1976 (1927)), p. 160