Why do some forests have undergrowth so thick you can’t get through it, and others are just tree trunk after tree trunk with no undergrowth at all?
In: Biology
Several people have mentioned pine forests and soil types but they are missing the mark. A lot of plants exude chemicals from their roots that repel other plants. This action is called allelopathy and is fairly common in the plant world. Pines interestingly have these chemicals in their needles and not the roots. Often when you see big areas of a single tree this is why.
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