Green Leaf Plants employees plant clippings, using color-coded flags. (Dan Marschka / Staff) A worker collects plant flats at Green Leaf Plants according to coding reflecting the stage of development.

Young leaflets' chloroplasts -- the part of the plant that contains the green pigment chlorophyll -- are still developing, so the leaves tend to be lighter.

Green Power: The Quest to Harness Energy From Leaves Researchers are using plants to light up LEDs and inspire a more versatile class of robots The planet already has trillions of leaves.

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Some area municipalities are encouraging a different leaf collection strategy, one where you don't need to rake your yard at all.

Those are green leaf volatiles, or GLVs: easily evaporated oils that plants use to communicate with other plants and defend themselves against herbivores or pathogens like bacteria or fungi.