Sun vs. shade


Blossoms on a dogwood tree (Cornus florida) growing in full sun because of the death of a large canopy tree that used to shade it.


A tree of the same species, on the same day. This tree is still shaded by another tall canopy tree.

Flowering dogwood is a very beautiful native tree that’s often used as a specimen, typically planted out on a front lawn in full sun. But this is never how the tree grows in nature, where it is always found growing under various species of oak trees. The only time dogwoods want full sun is in early spring, before those oaks leaf out.

The two dogwoods shown above are both growing on our front lawn. When I planted them, both were in shade, but since we lost two large trees last spring due to drought and decrepitude, the first one is now in full sun. The small oak we planted to shade it won’t be big enough to serve that function for several years. The tree in sun now blooms and leafs out considerably earlier than its relative only thirty feet away. It will experience a great deal more stress from heat and drought and will probably need supplemental watering. It is more likely to show the effects of anthracnose or other diseases. A native tree that’s adapted to a sunny site, such as a serviceberry, would do better in this spot.

Trees react to their environment in many ways. Pay attention to the total environment when you plant!


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