You should prune it in the spring just before it begins flowering to encourage robust growth.
- Cut any dead, damaged or diseased shoots with pruning shears. ...
- Cut down up to one-third of the older growth all the way to the ground.
When should I prune Solanum?
In late winter or early spring after flowering, prune side shoots to within 3 or 4 buds. RHS Pruning group 12. Solanum climbers will require tying in regularly and will need support.
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.
