Start new plants by taking six inch cuttings in June or July. But I think you might succeed at rooting a cutting if you bury most of a length of a tip in. March 2011 Garden Coach Photos Page 16 Purple Wisteria Wisteria Tree Plants Whether you do it in soil or water the best time is to take these cuttings in the late winter just before the new growth starts. Can you start wisteria cuttings in water . Place the cutting in a clean glass. Propagating the wisteria vine is easy to do and there are several different ways to do this. Check the soil frequently and water when dry to the touch. Root the cutting in. I thought if I got the cuttings started early and well established. Plant cuttings can vary. New vines can also be. Whether you do it in soil or water the best time is to take these cuttings in the late winter just before the new growth starts. You can take a cutting from an existing wisteria in spring through midsummer or in winter and grow it as a new plant.