Oak tree: Concentrates calcium in its bark (bark ash is 77% calcium). In a special tea, it helps plants resist harmful diseases. The oak tree provides a beneficial influence around it that helps create excellent soil underneath its branches. This is a great place to build a compost pile for the same reason, but keep the pile at least 6 feet from the tree trunk so the environment near the tree will not be conducive to disease or attractive to harmful insects.
https://www.thevegetablegarden.info/companion-plants
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