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does anything come OUT of the roots ?
I have a general plant/gardening question. Does anyone here know if anything comes OUT of roots ? I realize a mixture of water and dissolved nutients go IN the roots via roothairs, I believe. Besides needing to keep the nutrient level adequate is there anything that the plant puts back into the solution which might be harmful to the plant and worth removing ? i. e. drain the water/nutrient mix regularly and refill with a fresh batch. Use the waste/drainage to water the houseplants or soil-grown.
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