The seeds of a sugar maple tree do not mature at the same time every year, and different trees mature their seeds and different times So time of year is not a reliable measure of when seeds are ripe. In recent studies we have found that moisture content and color are the best criteria for judging when sugar maple seeds are ripe.
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To properly classify or grade logs or trees, one must be able to correctly identify indicators and assess the effect of the underlying defect on possible end products. This guide assists the individual in identifying the surface defect indicator and shows the progressive stages of the defect throughout its development for sugar maple. Eleven types of external defect indicators and associated defects that are particularly difficult to evaluate are illustrated and described.