May 20, 1852

 in Thoreau’s Journal: 

Now is the season of the leafing of the trees and of planting. The fields are white with houstonias, as they will soon be yellow with buttercups.  Perchance the beginning of summer may be dated from the fully formed leaves, when dense shade begins…Some apple trees in blossom—

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Most are just ready to burst forth—the leaves being half-formed.