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When I do it next I will be laying it out and measuring my row spacing. I like non seam rows as they just work better with the weeds. Seams can be a problem with allowing too many weeds to pop up, but too many is a VERY relative term. The whole garden is covered so the minimal weeding I have to do, I really can't complain.

The plastic I use is $56 for a 20x100 roll of 4mil black. This plastic will last about 3 or 4 seasons before it becomes too brittle. It just takes making the row cuts and then laying and taking up the plastic each season. SUPER worth it!