Japanese Lilac tree
How do I get a Japanese Lilac tree to bloom? I live in Zone 5-6. It's been at least 5 years since I planted the tree. It was a small fingerling from a catalog.
Certified GKH Gardening Expert
Here are various reasons why lilacs won't bloom, which may help, though the likely cause is a lack of phosphorus in the soil: https://www.gardeningknowhow.com/ornamental/shrubs/lilac/lilac-bush-not-blooming.htm