I converted some big pots into SWC last week. Using old cotton unmentionables cut into strips as wicks. My tests beforehand showed the material wicked well, and online research suggests a rise of around 15 inches.
End planting area is about six inches deep, with a reservoir about eight inches deep. For bunching greens, possibly some root veggies (also for greens). Maybe peppers later.
I cut paired slits in my shelf and threaded the strips through to make an X with a lot of soil contact. Seems to be working so far, and it's been hot, but not overly dry.
Tl
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