You’ll also want to reduce fertilizer and thin your plants. Ivory Silk Japanese lilac thrives in cooler areas, specifically in U.S. Department of Agriculture plant hardiness zones 3 through 6 or 7. But Ivory Silk Japanese lilac is not trouble free. Be patient, if the tree’s health does not seem to be declining, it may well recover. If your plant has bacterial blight, treating problems in Ivory Silk lilac involves pulling out and destroying infected plants. Ivory Pillar™ Japanese tree lilac (Syringa reticulata ssp. Do not pile mulch on the trunk flare – it should not touch the trunk. Ivory Silk tree care includes picking an appropriate planting site. The white flower plumes are around 10 to 12 inches long in June. 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This problem usually occurs in rainy seasons and rarely does serious damage to the tree. As well, removing the girdling root created a wound, which could leave the tree more vulnerable to disease and pests. Gardening Guides provide introductory information on a broad range of horticultural topics. 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. These Japanese tree lilac problems cause wilting and premature leaf drop. If your plant has bacterial blight, treating problems in Ivory Silk lilac involves pulling out and destroying infected plants. Plant Ivory Silk Japanese lilac in a full sun location. 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. Be patient, if the tree’s health does not seem to be declining, it may well recover. This is an excellent street tree. Mature size is around 25' tall x 15' wide. The Ivory Silk cultivar is loved by many gardeners for its impressive size and glorious flower clusters. 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. Cut out infected stems and destroy them. Expect branch dieback, this is normal during the recovery process. The more effort you put into planting this cultivar and Ivory Silk tree care, the fewer Japanese tree lilac problems you will experience. Sign up for our newsletter. Ivory Silk Japanese Tree Lilac has few problems. reticulata 'Ivory Silk'): More compact (20 to 25 feet high); flowers profusely and begins to flower at an early age. These bugs dig tunnels in the leaves in early summer. Early and appropriate fertilizing can help prevent other diseases like verticillium wilt. The Ivory Silk Japanese tree Lilac is sturdy and showcases a compact habit. As with other lilacs, a few pests can cause problems in Japanese tree lilacs. Ivory silk tree lilacs do not resemble any other lilacs you might have in your garden. Although the problems with Japanese tree lilacs are few and far between, you’ll want to know about treating problems in Ivory Silk lilac should they arise. Hardiness zone 3. Is there anything else I could do to help this tree along or is it a lost cause at this point? If planted in shade or warm climates, "Ivory Silk" flowers less heavily and may develop powdery mildew or other fungal diseases on its leaves. This lilac tree flowers at an early age. It sounds like you want to do everything you can for your Syringa reticulata ‘Ivory Silk’ ( Japanese tree lilac)! Very badly infested branches may break off. The 4th year there was some yellowing of leaves in the centre of tree followed by early leaf drop. Lilac borers can also be a problem. Also called Japanese tree lilac, the ‘Ivory Silk’ cultivar is a large, rounded shrub with very large clusters of off-white flowers. Another pest to look out for is lilac leaf miners. 777 Lawrence Avenue East Toronto, ON, Canada M3C 1P2 | Phone: 416-397-1345, Copyright © Toronto Master Gardeners 2019. Landscape Ontario  provides lists of various experts, including arborists, in your area. 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. Symptoms include brown spots on the leaves, surrounded with yellow borders; the edges of spots may overlap, forming a larger affected brown area of leaf tissue that rapidly dies. I have a 7 year old Ivory Silk tree that was doing wonderful the first 3 years. I removed the girdling roots and tried to expose more of the flare of the trunk. Award-winner Syringa reticulata 'Ivory Silk' (Japanese Tree Lilac) is a large shrub or small tree with an oval to rounded crown. 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 grows in the form of a pyramid in its early years but later expands to a rounded form. Water the tree deeply and well, over the entire root system, especially during dry periods over the summer.