Plants absorb AND reflect green light. Leaves are green due to a compound called chlorophyll. The light absorbed by chlorophyll is used to power photosynthesis, the conversion of light energy into chemical energy. On a relative basis, chlorophyll absorbs more blue and red light, compared to green light; and therefore reflects less red and blue light. As a result, there is more green light than red or blue light reflected, so the chlorophyll containing part of the plant appears green.
It is commonly thought that chlorophyll does not absorb green light, but that is a fallacy. A dark green leaf can absorb 90% of the green light impinging on it. In contrast, 95% of the red and blue light may be absorbed.
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