How to Grow Japanese Wisteria

Select a site where the vine will receive six or more hours of direct sunlight daily. Check the site for moist soil and a slightly acid pH between 6 and 7. Erect a sturdy trellis or plan the site against a solid wall -- the plant should be placed in an easy-to-access place, as regular pruning is crucial.

Dig a hole twice the size of the root ball of the wisteria, but not significantly deeper. Plant grafted wisteria so that the graft union is slightly below the surface. Plant a wisteria grown from a cutting at the same level as it was at the nursery. Pack dirt around the root ball and water thoroughly -- newly planted vines need about 1 inch of water per week.

Feed new plants to encourage growth, but don't expect blooms as long as the plant is being fed. Encourage growth until the plant fills the allotted space, then withhold fertilizer unless the plant appears to be sick. Withhold water unless there is a drought or if the foliage shows signs of wilting.

Apply a superphosphate fertilizer (0-20-0) if the wisteria refuses to bloom despite your best efforts at a rate of 3 to 5 lbs. per 100 square feet. Prune new growth in late spring or early summer instead of winter or early spring.