Leaves and Species Differences
Why do some trees lose their leaves faster than others?
The timing of leaf color change and leaf fall for particular species
appears to be genetically controlled. The following should be helpful:
Anthony Brach Ph.D.
Trees lose their leaves faster or slower because of two things. First,
trees are programmed to lose their leaves under specific conditions of
lower temperatures or shorter daylength. For example, some trees might
be programmed to drop their leaves when they have a week of 45 degree
weather and others after a week of 40 degree weather. The second way to
lose leaves faster or slower is because of where they are living. There
may differences even within 100 feet of two trees. There may be more or
less water. There may be better nutrients in one place than another.
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Update: June 2012