Question

3. Why do aerial roots need to come out of the soll
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Answer 1

Generally aerial roots will form on a succulent that isn't getting enough water and often when it's in a humid environment. Succulents absorb water through their roots from the surrounding air. That is why having a soil with large particles is really important for the health of your succulent

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Answer 2

There's probably no creepier story about roots than the one of the strangler fig tree. The story starts when a strangler fig seed is dropped by an animal into the branches of the host tree, where it quickly establishes itself before starting to send roots towards the ground. But, those roots are not just intended to get water and nourishment from the soil.