I have rooted lots of plants through the years. The ones in the glass jars grew well beyond those 1st 14 inch roots. How To Grow Sweet Potato Slips Week 4 Sweet Potato Slips Growing Sweet Potatoes Sweet Potato Plant You should not plant the vine until at least two weeks after the last expected frost. Rooting sweet potato vine in water . Take cuttings from the main vine that are at least four inches long. Roots will form in the water and sprouts will form in the top part of the potato. Plants can also be brought indoors and treated as houseplants. Sweet potato vines are easy to grow from existing plants. The easiest way to propagate the sweet potato plant is through cuttings. Make sure that you trim the vine at a leaf node. Remove all the leaves off the bottom few inches and submerge the stem in water. To do so break off a branch that has several leaf nodes. I collect pretty glass pill bottles etc for rooting baby plants. There might already be a rudimenta...