We have a Primrose Lilac which is now in its 6th year and has yet to put out any blooms. It is otherwise a beautiful and healthy bush. Do you have any suggestions as to why we are not getting flowers?
Certified GKH Gardening Expert
It is probably lacking phosphorus. This is will affect blooming. This article will explain more: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/phosphorus-plant-growth.htm This article will also help you: https://www.gardeningknowhow.com/ornamental/shrubs/lilac/lilac-bush-not-blooming.htm