Plants release chemicals that affect other plants growth from their roots into the ground. The plants trying to grow near the allelopathic plant absorb those chemicals from the soil and are unable to live.
Some plants release chemicals from their roots that will slow down or stop any plants nearby from the process of photosynthesis. The chemicals actually change the amount of chlorophyll a plant produces. This affects the amount of food the plant can make. If a plant can’t make food it will die.
Sometimes plants release chemicals in the form of gasses. These gasses are released through the small pores in the plant’s leaves. Other plants absorb the gas and are stunted or die.
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