The Science Behind Fall Foliage Color Changes

Chlorophyll Breakdown

Chlorophyll masks other pigments all summer. As days shorten and temperatures cool, chlorophyll production slows and existing molecules break down, revealing hidden colors.

The Pigment Palette

• Carotenoids (yellow/orange): Always present, revealed in fall. Birch, aspen, hickory, ginkgo
• Anthocyanins (red/purple): Newly made from trapped sugars. Maples, oaks, dogwoods
• Tannins (brown): Waste products in dead cells. Oaks and beeches

Environmental Factors

Best color: warm sunny days + cool (not freezing) nights. Drought causes early, muted change. Adequate summer rain + dry sunny autumn = best displays.

Species Spotlight

Sugar maples produce the full spectrum. Red maples turn scarlet. Ginkgo turns gold almost overnight. Sweetgum shows multiple colors on one tree.

Climate Change Impact

Warmer autumns delay color and reduce intensity. Peak foliage has shifted 2-3 weeks later over 50 years in northern regions.

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