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Old June 29, 2016   #2
wmontanez
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Join Date: Jan 2010
Location: MA
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Depends on the potatoes you select to grow. Anything commercially available is just wasting dirt to get towers. By commercial available I am talking Yukon Gold, Red Norland, Russet Burbank and the like. From other container growers I found that going above 16in depth also does not produce much difference.

Sweet potatoes: Growing vertically means trellising the greens upwards. I suppose a depth of 12in or so is more than enough to the roots to develop. If possible select a bush type. The vines of sweet potato that tend to sprawl have to be secured (tied) to the trellis because it does not have tendrils like cucumbers/peas/watermelon. Is worth mentioning that sweet potato greens are edible too.

For the both types of potatoes, mulching helps with moisture retention.
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