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Why do leaves change colour?

Weekly Quest No. 1 · Leaf Detectives. A leaf hunt, a hidden-colour experiment, a leaf collage and a stamp card. JK to Grade 5, 20–40 minutes.
Maple leaves arranged in a gradient from green through yellow and orange to red

WEEKLY QUEST · No. 1 · LEAF DETECTIVES

MoveMakeExplore20–40 minJK–Grade 5Science · Math

Watch first (60 seconds)

Explore: read this aloud

Four frames: a green leaf in summer sun; shorter fall days and the green fading; yellow and orange showing; a red leaf made fresh after sunny days and cool nights

Leaves are green because they're full of chlorophyll, the part that turns sunlight into food for the tree. In fall the days get shorter and the tree stops making chlorophyll. As the green fades, yellow and orange show through. They were hiding under the green all summer. Reds are different: the tree makes those fresh in fall, most of all after sunny days and cool nights.

What's in the Quest

Move: the Leaf Hunt

Find leaves in as many colours as you can. Then play Wind and Tree: one person is the tree, the other is the wind. Every "gust!", the tree drops a leaf.

Make: hidden colours

Tear a green leaf into a jar, a grown-up adds rubbing alcohol, stand a coffee-filter strip in it, and watch the yellow climb the paper. It was in the leaf all along.

Make: leaf collage

Press your leaves flat overnight, glue them inside a pumpkin, acorn, apple, tree or owl, and add sparkles last. The full-page outlines are in the PDF.

★ If you want more

Turn your leaf tally into a bar graph, measure your biggest and smallest leaf, and invent a sorting rule nobody else would think of.

What the pages look like

Leaf Sort page: five colour columns to tally leaves, a leaf identification row, a box to draw a favourite leaf, and an I noticed line

Curious Kite · All Quests · Change the method. Not the child.