There are fungal networks in the ground that allow trees to share resources. It’s actually very fascinating. Essentially, the trees have a symbiotic relationship with these fungi and share their resources with them and other trees through them.
If you would like to learn more, here is an excellent and entertaining radiolab podcast on it.
https://www.wnycstudios.org/podcasts/radiolab/articles/from-tree-to-shining-tree
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