Wisteria are long-lived landscape specimens valued for their copious fragrant blooms. These vigorous vine ornamental plants are practically care-free once established. But for them to perform well for many years to come, soil preparation is necessary to accommodate their modest needs. Once the soil has been properly prepared, enjoy planting your wisteria.
Select a well-draining site in full sun for your wisteria. These plants require at least six hours of direct sunlight each day. They prefer moist locations that don't dry out excessively, but won't tolerate wet feet. Multiple plants will need at least 10 to 15 feet of space between them.
Test the soil for pH and phosphorus levels. Wisteria prefer neutral to somewhat acidic soil with a pH range of about 6.0 to 7.0. Make needed changes while you're preparing the soil.
Prepare a 3-foot diameter area for the wisteria plant. Cultivate the soil to a depth of at least 18 to 24 inches. Improve the aeration and drainage properties by mixing in compost, peat moss or well-rotted manure. The organic material should comprise about 1/3 of the cultivated area's soil.
Adjust the site's pH level if necessary. If it's too high, apply aluminum sulphate or sulfur. If the pH tests too high, use garden lime. Follow the packaging instructions carefully.
Apply a super phosphate 0-20-0 fertilizer to the area if your soil test results indicate that the phosphorus level is low. Phosphorus is crucial for the development and production of blooms, fruits and seeds. Follow the manufacturer's recommendations carefully.