A riddle may be square, rectangular or circular in shape, with a rim made from
wood, metal,
plastic or
beechwood, holding in place a
steel wire mesh that may either be handwoven or machine-made. A typical circular riddle is approximately in diameter and the mesh may have a spacing of something like , , , , or . A riddle is typically used to improve
soil quality by allowing the
gardener to sieve through soil and remove stones, twigs, large lumps of
clay etc. and hence provide a finer
tilth. Smaller riddles can be used to separate soil very finely for seeds and early potting. Riddles may also be used to help remove soil from harvested vegetables. ==See also==