I’m growing in soil and have been for a few years and I find you absolutely need to ph your water and feed. Rain water has no minerals and is naturally acid however the soil will only buffer the rain water if you something to buffer like lime stone. Companies add buffers to soil. Fox farm uses oyster shell but in my experience that won’t last the entire grow.
You can build a soil that doesn’t require you ph your water but most bought soils will require a ph adjustment before the the grow is over. I personally would like to avoid lockout and ph issues so ill keep checking my ph.
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