Sign up to get all the latest gardening tips! Prune any dead branches every couple of years. They are very showy and last two weeks on the tree. Lilac borer is one of them. The damage can cause wilting, particularly on stressed trees. A light surface mulch on the exposed roots helps retain soil moisture. This lilac tree flowers at an early age. On the other hand, too much nitrogen fertilizer can bring on bacterial blight. The Ivory Silk Japanese tree Lilac is sturdy and showcases a compact habit. Water the tree deeply and well, over the entire root system, especially during dry periods over the summer. This problem usually occurs in rainy seasons and rarely does serious damage to the tree. Although this study related to a different tree than yours, it illustrates that  there may be other factors that impact tree recovery, which we have not considered. All parts of the plant may … The cream-colored blossoms arrive in summer. If planted in shade or warm climates, "Ivory Silk" flowers less heavily and may develop powdery mildew or other fungal diseases on its leaves. It is not possible to accurately predict if or when the tree will fully recover, as it can take several years for roots to regenerate, and other factors may come into play. The more effort you put into planting this cultivar and Ivory Silk tree care, the fewer Japanese tree lilac problems you will experience. Cut out infected stems and destroy them. Ivory Silk tree care includes picking an appropriate planting site. My question is….how long does it take for a Ivory Silk tree to show signs of recovery after girdling roots are removed and more of the trunk flare has been exposed. Early and appropriate fertilizing can help prevent other diseases like verticillium wilt. The larvae tunnel into the branches. But Ivory Silk Japanese lilac is not trouble free. For example, the season the girdling roots are removed may have some impact; Johnson (see link below) notes that in a study involving red maple trees, root removal in the summer resulted in better growth over a 2-year period than when the roots were removed during the fall or summer/fall combination. You’ll also want to reduce fertilizer and thin your plants. 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This is especially problematic in hot, humid climates at the edge of its hardiness zone. I removed the girdling roots and tried to expose more of the flare of the trunk. Sign up for our newsletter. Lilac borers can also be a problem. Consider whether the soil is deficient in nutrients, which could contribute to the stunted/yellowing leaves. For example, the roots you removed may have supplied some of the water and nutrients to the tree canopy, and the tree will need time to compensate for this loss. In early summer, a profusion of huge clusters, 6-12 in. Lilac borer is one of them. Urban pollution does not create any extra problems. The Japanese lilac tree--which can grow to 25 feet tall and almost as wide--makes an impressive specimen planting or accent tree. As with other lilacs, a profusion of huge clusters, 6-12 in rounded crown the same in to. 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