Knowledgebase
What is happening to my lilac shrub? #867380
Asked May 07, 2024, 10:01 AM EDT
Wayne County Michigan
Expert Response
Hello Rachel,
Early blooming lilac (Syringa oblata), prefer loose, well-drained, soils, and is pH adaptable; full sun for best flowering and good air movement. Read more here: https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=283001
From the picture you sent the plant seems to be in a very small space and the roots may be competing with the yew and dogwood for water and nourishment. If you have not done one, a soil analysis would show whether the shrub is getting the required nutrients from the soil. To obtain a soil testing kit, go to: https://homesoiltest.msu.edu/get-started .
Since the shrub has been in that spot for a number of years, it appears that it is moving toward the sun. The lilac requires sun to flower and the tree growing beside it may be shading it out at the back where the flowers and leaves are not emerging.
Therefore, it is difficult to say what could have caused the problems with your lilacs from the picture. You could send the picture to the MSU Plant and Pest Diagnostic Lab for analysis. Go to: https://www.canr.msu.edu/pestid/ to learn how to submit pictures and samples.
You could also contact a certified arborist to advise you. Go to: www.treesaregood.org the website of the International Society of Arboriculture to find an arborist in your area.
Good luck with your lilacs.
Thank you for contacting Ask Extension.