Wait untill the slip gets about a foot long then root in water. I dont think rooting in dirt is a good idea. Leave them in water and harden them off as you would a tomato plant then plant the bare root in your garden.
After they reach 1 ft.They need the water to grow roots. Growing in zone 5 or 6 will work. Im not sure why you have them in dirt. Its way too early for that. Once bare root slips are ready they can stay in a glass of water for 2 months until its warm enuff to plant outdoors. The goal is to have bare root slips. they work the best.
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Wait untill the slip gets about a foot long then root in water. I dont think rooting in dirt is a good idea. Leave them in water and harden them off as you would a tomato plant then plant the bare root in your garden.
They seemed to need more than water to grow faster.
After they reach 1 ft.They need the water to grow roots. Growing in zone 5 or 6 will work. Im not sure why you have them in dirt. Its way too early for that. Once bare root slips are ready they can stay in a glass of water for 2 months until its warm enuff to plant outdoors. The goal is to have bare root slips. they work the best.
Do you leave them on the potato until they are 1 foot?
Yes
After i grew Sweet Potatoes for a few years i found this guy who wrote a book on this subject.
http://home.cogeco.ca/~allan/sweet_potatoes_flyer.html