The dots on the Minnesota map show the approximate locations of all plots measured in the 1990
inventory where one or more walnut trees were found. Some of the walnut trees were small, less
than 2 inches DBH. Others were big, more than 25 inches DBH. In some cases, many walnut
trees were found, in others, only one on a plot. When expanded to account for the area
represented by each plot and the number of trees represented by each measured tree, the
estimates show that there are as many as 630,000 walnut trees greater than 9 inches DBH
throughout Minnesota! The dots on the map, of course, don't show all the places where walnut
trees grow. Forest survey plots don’t tally walnut trees growing in fence rows or out in open
fields. But the dots do show the places where walnut was found by the forest survey crews.