Why Fall Leaves Put on a Colorful Show

It's that time of year again when trees start showing off their autumn colors. But what makes leaves change from green to brilliant reds, oranges, and yellows? The answer isn't really about temperature like many people think.

The real driver is daylight. As we move past the summer solstice, days get shorter. This signals trees to slow down chlorophyll production. Chlorophyll is what makes leaves green during spring and summer when they're busy soaking up sunlight.

When chlorophyll fades, other pigments hidden in leaves come to light. These pigments were there all along, just masked by the green. The mix of remaining colors creates that classic fall palette.

Weather plays a big role too. A wet summer followed by a dry fall usually means the best show. Warm sunny days and cool nights help preserve the colors. But a dry summer, rainy fall, or early frost can ruin the display.

So next time you see leaves changing, remember it's not just about getting colder. It's about the sun setting earlier each day, telling trees it's time to rest.