As your expertise grows, and others' awareness of your career grows, leaf color explanation will be an annual event (I'm betting it is already for some of you).
Like temperature and sunlight, soil moisture also plays a role in how the leaves will appear this fall. As day length gets shorter after the equinox (September 22), cells in each leaf create a layer that prevents new chlorophyll (it's called the abscission layer). Severe drought causes the abscission layer to form earlier and leaves often dry up or drop before they change color. Heavy rain and wind can cause the leaves to fall before they fully develop color.
The best color scenario is a growing season with plenty of moisture followed by a dry, cool and sunny autumn with warm days and cool but frost-free nights.
Like temperature and sunlight, soil moisture also plays a role in how the leaves will appear this fall. As day length gets shorter after the equinox (September 22), cells in each leaf create a layer that prevents new chlorophyll (it's called the abscission layer). Severe drought causes the abscission layer to form earlier and leaves often dry up or drop before they change color. Heavy rain and wind can cause the leaves to fall before they fully develop color.
The best color scenario is a growing season with plenty of moisture followed by a dry, cool and sunny autumn with warm days and cool but frost-free nights.
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