Oh damn you werent kidding about letting them get a few feet long. I cut mine off around 3-6 inches but many failed. Maybe I need to grow them longer like you are doing.
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Water is useless to grow things!
Yeah, 3 to 6 inches seems pretty short. It might work alright with some rooting formula. I personally wouldn't go any shorter than maybe about 8 or 9 inches though.
Really short ones did seem to fail a bit more in the past for me, but I'd probably have to do an experiment to know for sure what the optimum length is.
About a foot just seems about right, since it gives you space to cut, remove a few leaves, and still have a few at the end, then stick it in the ground.
Sweet potatoes are pretty easy to grow though. You can actually just work the vines back into the soil with a hoe and quite a few will pop back up. They'll also pop up out of your compost after harvest for a few weeks or months.
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