I have a hibiscus plant that we have outside in warm weather and bring in the house for winter. It is at least three years old and the blooms are always beautiful. The last it bloomed was a year ago Christmas. It has never bloomed again. Is it done blooming because it was never meant to be a house plant? The frost would have killed it had I not brought it in the house for winter.
Will It Bloom Again?
Certified GKH Gardening Expert
It likely needs some more fertilizer, especially phosphorus which helps with blooming. Use a "bloom booster" fertilizer or add some bone meal to the soil to help add some phosphorus.
Have you considered pruning it? Sometimes, a good pruning may be just the jolt it needs to kick flowering into high gear. This article will help with that: https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/tips-for-pruning-hibiscus-plants-when-to-prune-hibiscus.htm