They are only hardy to about 45 degrees F. Prune them back anytime their length becomes excessive. Also, cut off any damaged stems and ones that have become leggy with little foliage. If healthy, the trimmings can be placed in water and left to root to create more plants.
Do you cut back sweet potato vines?
The long vines of sweet potatoes can overrun a garden. In early to mid-September, feel free to cut them back by 25%. This simply makes the plants easier to deal with when digging. Sweet potatoes with edible tubers developing below the ground.
Can you cut back potato vine?
Cut back the ornamental potato vines from spring through fall, as needed, to contain the size or shape of the plant. Pruning will also increase the bushiness of the plant, as it encourages branching at the cut sites. Prune judiciously or not at all if you prefer longer, vine-like foliage.
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