MIMedGrower
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I mean I'm all about cost cutting at every corner so that's where my opinion lies. Do you plan to reuse the soil? Maybe run them both on a run side by side and decide. Should be a huge issue if you don't have a crazy plant count. Reusing it would cut that cost to almost nothing most likely. Maybe start composting. I feel if going this route you do it 100% to get the best bang for your buck.
I would never reuse soil inside. And no composting. I do plan to do it outside eventually if I can ever clear my side lot and build a greenhouse.
But you are right about cost. And my perpetual production does keep a tab rolling.
Thanks for the perspective.