Urban pollution does not create any extra problems. Prune any dead branches every couple of years. Hardiness zone 3. When tree roots are severed, the balance between the crown (top) of the tree and its root system is altered, which  is stressful for the tree. If your plant has bacterial blight, treating problems in Ivory Silk lilac involves pulling out and destroying infected plants. If planted in shade or warm climates, "Ivory Silk" flowers less heavily and may develop powdery mildew or other fungal diseases on its leaves. I mentioned that other issues may affect a tree’s recovery time. The white flower plumes are around 10 to 12 inches long in June. 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. As with other lilacs, a few pests can cause problems in Japanese tree lilacs. On the other hand, too much nitrogen fertilizer can bring on bacterial blight. Ivory silk tree lilacs do not resemble any other lilacs you might have in your garden. Be patient, if the tree’s health does not seem to be declining, it may well recover. The tree accepts any well-drained soil, including sand or clay, and will grow in soil with a pH of acidic to slightly alkaline. Landscape Ontario  provides lists of various experts, including arborists, in your area. Gardening Guides provide introductory information on a broad range of horticultural topics. As well, removing the girdling root created a wound, which could leave the tree more vulnerable to disease and pests. These bugs dig tunnels in the leaves in early summer. They are very showy and last two weeks on the tree. You can identify powdery mildew by the white powdery substance on leaves and stems. Ivory Silk tree care includes picking an appropriate planting site. Plant Ivory Silk Japanese lilac in a full sun location. The damage can cause wilting, particularly on stressed trees. Ivory Silk Japanese Tree Lilac has few problems. Also called Japanese tree lilac, the ‘Ivory Silk’ cultivar is a large, rounded shrub with very large clusters of off-white flowers. Flowers may also wilt and die. Consider whether the soil is deficient in nutrients, which could contribute to the stunted/yellowing leaves. I did at this point gently remove soil around base of tree and discovered some girdling roots. The more effort you put into planting this cultivar and Ivory Silk tree care, the fewer Japanese tree lilac problems you will experience. The 5th year the leafs were stunted in size and canopy was sparse but the tree had its blooms. It sounds like you want to do everything you can for your Syringa reticulata ‘Ivory Silk’ ( Japanese tree lilac)! Mature size is around 25' tall x 15' wide. The larvae tunnel into the branches. Keep your eye out for young shoots that develop black stripes or leaves that develop black spots. Early and appropriate fertilizing can help prevent other diseases like verticillium wilt. long (15-30 cm), packed with fragrant, tiny creamy-white flowers adorn the tree. Find more gardening information on Gardening Know How: Keep up to date with all that's happening in and around the garden. Sign up to get all the latest gardening tips! This problem usually occurs in rainy seasons and rarely does serious damage to the tree. The Japanese lilac tree--which can grow to 25 feet tall and almost as wide--makes an impressive specimen planting or accent tree. If this is the case, slow-release nitrogen fertilizers may benefit the tree. reticulata 'Willamette'): A more narrow, upright form (25 feet high by 15 feet wide). The Lilac Borer may cause issues as it primarily attacks the main trunk of the tree. 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. It sounds like you want to do everything you can for your Syringa reticulata ‘Ivory Silk’ ( Japanese tree lilac)! I have a 7 year old Ivory Silk tree that was doing wonderful the first 3 years. This is especially problematic in hot, humid climates at the edge of its hardiness zone. reticulata 'Ivory Silk'): More compact (20 to 25 feet high); flowers profusely and begins to flower at an early age. 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