Wisteria why not flowering

Shoots Question: After many years of healthy growth, the shoots of my wisteria are suddenly wilting and dying. What has gone wrong? There are a number of possible causes for this symptom. Wisteria can suffer from root diseases such as honey fungus and Phytophthora root rot.

Waterlogging can also cause root decay, in both soil- and container-grown plants Roots of container plants in particular can suffer damage from vine weevil grubs.

Wisteria also appears prone to graft failure , sometimes after many years of satisfactory growth. When this happens the graft union usually close to soil level often decays, although this is a secondary symptom.

If the dead branches have numerous pinhead-sized, raised, coral-pink pustules on the surface then coral spot is involved. However, this disease often attacks plants already weakened or dying back due to other problems. Finally, a severe attack by wisteria scale see below can weaken the plant enough to cause some dieback. Question: The bark of my plant has numerous brown, limpet-like structures on it. What are they?

Leaves Question: What is causing the brown blotches on the leaves of my plant? There are a number of possibilities here. If your plant has been grown from seed, it can take up to twenty years to flower, and even then the results may be disappointing! A named cultivar should be more successful, particularly if it is already flowering when it is bought. However, do not be alarmed if such a plant is reluctant to flower in the first year or two after planting.

This is perfectly normal and the plant will settle back into flowering once the roots are established. The flower buds on wisteria, like those of many spring-flowering plants, start to develop in late summer of the previous year. Adverse conditions, particularly dry soil, occurring between July and September can cause the buds to abort. Ensure that your plant has an adequate supply of water during this critical period. Sharp spring frosts can cause flower buds to drop before opening, or result in distorted flowers.

Other possible causes for poor flowering are too much shade, or inadequate levels of potassium. On poor soils it may be worth applying sulphate of potash in spring at 20g per square metre. You may also like. Disposing of diseased material. The Mechanics Above: On the leader, encourage horizontal branching. Remove suckers new growth that appears in the crotch of two branches. Wisteria: A Field Guide. Join the conversation.

Related Stories. Read all recent posts. You might be surprised to know that jasmine holds. David is the cofounder of Terremoto, a landscape d. Ken and Jean Victor Linsteadt love symmetry. North Carolina State University Extension recommends at least six hours of direct sunlight a day.

A wisteria tree does not tolerate shade well and may be getting too much of it. You may need to prune nearby trees to reduce shade. Prune wisteria aggressively in the spring, cutting the plant back until it is a few feet shorter than you would like it to be.

In the summer, trim as needed to keep the desired shape and cut off any runners that are more than 6 feet long or heading in an unwanted direction. Over pruning is almost impossible, so when in doubt, prune. Wisteria is an aggressive grower and must be pruned regularly to keep it from overtaking both the garden and the house -- a vine may need to be pruned three or four times in the summer to keep up with its growth.

Timid pruning may be one reason wisterias do not bloom. Root prune the vine in late fall by cutting into the soil vertically around the main trunk, about four feet away from the plant.