According to SFGate, a couple of diseases could cause a wisteria to die, the more serious being canker disease. This disease destroys the foliage of the plant and leaves dark lesions. Prune infected vines immediately to prevent spread of the disease. Keeping the plant hardy also helps to prevent canker problems.Know More
The tobacco mosaic virus causes wisteria foliage to develop a mottled discoloration. The virus spreads easily and there is no cure for it. Prevent this virus by planting resistant varieties of wisteria. If infected vines are noted, destroy them immediately.
Two species of scales affect wisteria. These tiny, hard-shelled insects attack the vines. The calico scale has a light brown cover. As these insects feed on the wisteria, they secrete a sugary substance known as honeydew. Honeydew causes disease to the vine and attracts ants that do further damage. The second type of scale, the wisteria scale, is darker than the calico scale. It attaches to the vine to feed. High-quality horticulture oil protects the wisteria from both types of insect. Lacewings and parasitic wasps are natural predators for scales and present an organic solution to the problem.
If the dying wisteria is a recent addition to the garden, graft problems are a potential reason for it to die. Nurseries propagate wisteria through grafting. If the graft is not healthy, the plant dies.Learn More
Plant wisteria in the spring or early fall, depending on the growing zone. Wisteria shrub grafts may take up to six years or more to begin flowering. Wisteria grown from seed may take 20 years or more to flower.Full Answer >
Hydrangeas may die due to improper care, such as overwatering, by exposure to extremely cold temperatures and by infection with disease such as root rot. Some hydrangeas are more susceptible to disease and changes in environmental conditions than others are. Generally, hydrangeas enjoy plenty of sunlight while only big leaf hydrangeas are vulnerable to damage from environmental factors such as freezes.Full Answer >
Clematis wilt is often the culprit behind a dying clematis plant. According to Gardening Know How, clematis wilt is caused by fungus infestation. Clematis wilt affects the top of the plant and spreads downward until the entire plant dies.Full Answer >
Chrysanthemums, or garden mums, typically die due to disease or pests if they are being properly cared for. Although mums are one of the hardiest of plants, a number of diseases can kill them.Full Answer >