How Trees Prepare for Winter Dormancy

The Dormancy Process

As days shorten, trees detect photoperiod changes through light-sensitive pigments. This triggers hormonal shifts: auxin decreases, abscisic acid increases, and the tree begins systematic winter preparation.

Leaf Abscission

Deciduous trees form an abscission layer at each leaf stem base. This corky barrier cuts off water flow, causing chlorophyll breakdown and revealing hidden pigments (carotenoids = yellow/orange, anthocyanins = red/purple).

Cold Hardening

Trees acclimate in stages. Sugars accumulate as antifreeze. Cell membranes become flexible to resist ice crystal damage. Some species survive -40F after full hardening.

Root Activity in Winter

While tops are dormant, roots continue slow growth in unfrozen soil. This is why fall-planted trees establish well — energy goes underground.

Evergreen Adaptations

Conifers retain needles protected by waxy cuticles and antifreeze compounds. Narrow shape reduces snow load, and flexible branches bend under weight.

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