Why do evergreen trees not lose their leaves in the fall?

Evergreen trees do not keep their leaves indefinitely, but rather may grow new ones before the old ones fall, or keep some and drop others over a period of time.

As any southern gardener can tell you, some broadleaf evergreens, like Magnolia grandiflora, drop their heavy leaves in a staggered cycle over the course of the year.

Some, like the live oak, may show a heavy leaf loss in early spring, but retain a few old leaves while the new ones develop.

There is also seasonal needle loss with evergreen species of conifers, like pine, spruce, and fir trees. The leaf drop is a normal process, not a disease. The older,