I have white liatris in my garden that never turned white. They grew to be healthy, and I am perplexed as to why it never bloomed. They are in full sun. I watered it enough, even fed it my beautiful compost, but why hasn't it bloomed for me?
Certified GKH Gardening Expert
You may need to add more phosphorus to the soil, which helps promote blooming. This article will help: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/phosphorus-plant-growth.htm