As with other lilacs, a few pests can cause problems in Japanese tree lilacs. The tree accepts any well-drained soil, including sand or clay, and will grow in soil with a pH of acidic to slightly alkaline. If you plant in a shady location, for instance, they can develop powdery mildew. Be patient, if the tree’s health does not seem to be declining, it may well recover. This problem usually occurs in rainy seasons and rarely does serious damage to the tree. The larvae tunnel into the branches. Also called Japanese tree lilac, the ‘Ivory Silk’ cultivar is a large, rounded shrub with very large clusters of off-white flowers. If your plant has bacterial blight, treating problems in Ivory Silk lilac involves pulling out and destroying infected plants. The 5th year the leafs were stunted in size and canopy was sparse but the tree had its blooms. Water the tree deeply and well, over the entire root system, especially during dry periods over the summer. Plant Ivory Silk Japanese lilac in a full sun location. This is especially problematic in hot, humid climates at the edge of its hardiness zone. 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. 777 Lawrence Avenue East Toronto, ON, Canada M3C 1P2 | Phone: 416-397-1345, Copyright © Toronto Master Gardeners 2019. reticulata 'Ivory Silk'): More compact (20 to 25 feet high); flowers profusely and begins to flower at an early age. 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 plant can grow to 30 feet (9 m.) tall and 15 feet (4.6 m.) wide. If your plant has bacterial blight, treating problems in Ivory Silk lilac involves pulling out and destroying infected plants. The damage can cause wilting, particularly on stressed trees. Ivory Pillar™ Japanese tree lilac (Syringa reticulata ssp. This tree must be planted in a well-drained site without any high nitrogen fertilizer. Ivory Silk Japanese lilac thrives in cooler areas, specifically in U.S. Department of Agriculture plant hardiness zones 3 through 6 or 7. 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. Sign up for our newsletter. Mature size is around 25' tall x 15' wide. Hardiness zone 3. Award-winner Syringa reticulata 'Ivory Silk' (Japanese Tree Lilac) is a large shrub or small tree with an oval to rounded crown. When the caterpillars emerge, they eat all the foliage. Very badly infested branches may break off. If planted in shade or warm climates, "Ivory Silk" flowers less heavily and may develop powdery mildew or other fungal diseases on its leaves. Gardening Guides provide introductory information on a broad range of horticultural topics. Larvae of the borer will tunnel into larger branches and start feeding on tasty phloem. Find more gardening information on Gardening Know How: Keep up to date with all that's happening in and around the garden. Prune any dead branches every couple of years. I did at this point gently remove soil around base of tree and discovered some girdling roots. If you catch these pests early, just pick off the miners by hand. This is a common bacterial infection that causes health problems for the Japanese lilac tree, often attacking plants during excessively wet periods, entering through wounds or natural pores. Early and appropriate fertilizing can help prevent other diseases like verticillium wilt. Cut out infected stems and destroy them. Urban pollution does not create any extra problems. The 4th year there was some yellowing of leaves in the centre of tree followed by early leaf drop. On the other hand, too much nitrogen fertilizer can bring on bacterial blight. Ivory Silk Japanese Tree Lilac has few problems. I have a 7 year old Ivory Silk tree that was doing wonderful the first 3 years. If this is the case, slow-release nitrogen fertilizers may benefit the tree. In any event, best practices to enhance recovery of the tree after removal of girdling roots include: Here are links to a couple of good resources: Finally, you may want to consult an arborist to confirm that your tree is indeed on the road to recovery. In early summer, a profusion of huge clusters, 6-12 in. As well, removing the girdling root created a wound, which could leave the tree more vulnerable to disease and pests. long (15-30 cm), packed with fragrant, tiny creamy-white flowers adorn the tree. Lilac borer is one of them. You can identify powdery mildew by the white powdery substance on leaves and stems. Is there anything else I could do to help this tree along or is it a lost cause at this point? Flowers may also wilt and die. 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