Grand Avenue by Mike Thompson for November 21, 2013

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    jackdohany  almost 11 years ago

    Yeah. Leave the leaves be. They’ll turn into fertilizer.

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    Comic Minister Premium Member almost 11 years ago

    Agreed Kate.

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    Lamberger  almost 11 years ago

    There are 4 main types of coloring agents in the leaves:Chlorophyl A is dark green, Chlorophyl B is light green, Zanthophyl is yellow, and Carotine is orange-red.

    The leaf base is usually grey to black.

    These agents die off in that order. Thus, the fall colors.

    The amount of “antifreeze” (usually sugar) in the sap and the shape of the leaf — especially the stoma, or respiratory openings, in the bottom of the leaf — determines the precise temperature at which each agent dies, if at all.

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