Once you get your mother plant or potato that is disease free then you take cuttings and root them in water just like a house plant. Sweet Potato Cultivation - Propagation
Once winter comes you have the potatoes and a few house plants for next year
Next spring stick the cuttings in water and root a bunch again! The nice part is if you have to many slips and to much greens to ever sell the greens are edible to and most people dont eat them.
Sweet Potato Greens - Transplanting Traditions Community Farm.
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Sweet Potato Greens
Photo Credit: Tha Dah Wah
DESCRIPTION: Sweet Potatoes are one of NC’s biggest crops and yet, most of us have never tried eating the greens. Sweet potato greens are the edible leaves of the sweet potato vine. Though widely eaten throughout Asia & Africa, they are less well known to most of us in the U.S. The good news is they’re edible and delicious, high in Vitamin C and B6, and they thrive in the summer heat, unlike all the other leafy greens we crave.
Cook them up just like you would chard or water spinach (they’re tender, so don’t take long at all to cook) in a stir-fry, stew, omelet, or simply sauteed alone with some garlic. Be sure not to include the larger stems, since they’re tough. Saute them with garlic or onions in olive oil until tender, braise them in coconut milk with ginger & turmeric, or use them in place of spinach in saag paneer (I will often use feta if I can’t find Indian paneer).
STORAGE: Store sweet potato greens wrapped in a dry paper towel inside an open bag in your fridge for several days. If they wilt a little, don’t worry. They wilt easily, but will cook up just fine. NOTE: like water spinach, they don’t keep for long, so eat them right away.
RECIPE: Sweet Potato Greens in Lemongrass and Coconut Milk (adapted from Love & Olive Oil) serves 4
Bring a pot of water to a boil. Add a good pinch of salt. Remove any thick stems from your bunch of greens and toss the greens into the boiling water. Blanch for half a minute or until tender and drain. Set aside. Trim your lemongrass and finely slice a 2 inch length of it. Mince an onion, a clove or two of garlic, and a half inch piece of fresh ginger. Heat a couple tablespoons of oil in a big pan over medium heat and add your minced ingredients along with a pinch of ground turmeric (optional) and a pinch of chili flakes (optional) and a pinch of salt. Stir in a spoonful of soy sauce. Stir in 2 cups coconut milk and bring to a simmer. Now, add in your blanched greens and simmer for a couple minutes. Stir in a spoonful of sugar and season to taste with salt and pepper. Serve with rice.
MORE RECIPES:
Stir Fried Sweet Potato Greens
Korean Stir-Fried Sweet Potato Stems "
If someone is selling bundles of greens at a local health food store they can be made into slips also by rooting them in water.