What Causes Yellow Leaves on Plants?

A healthy indoor garden adds eye-catching character and color to any room. Each plant has specific needs, and when leaves turn yellow and drop off it may be for a number of reasons. Take this true/false quiz to test your knowledge on causes to see when it should be a concern.

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1. Light is an important factor in plant health, but too much light can cause yellowing leaves in some house plants.
What Causes Yellow Leaves on Plants?