I have an indoor hibiscus, which I have had for several years. However, although very healthy with glossy leaves and new growth, ever since I pruned the plant last year it hasn't flowered. The cuttings I potted on have flowered. I feed the plant weekly. I have had hibiscus in the past with no problems. Can you help?
Hibiscus Stopped Blooming
Certified GKH Gardening Expert
If it bloomed in the past and is not blooming now, it is likely a phosphorus deficiency. I would add bone meal around the plant. Also, if you pruned too late, then this could attribute to the flowering delay. Maybe this article on pruning hibiscus will help: https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/tips-for-pruning-hibiscus-plants-when-to-prune-hibiscus.htm
You said you fertilize weekly. You might want to rethink that routine - plants can be over-fertiiized! Nitrogen promotes green leaf growth as opposed to flowers. Try to leach out the extra fertilizer - that means run alot of water through the soil, at least 5 times the volume of the pot - before adding the bone meal. In the future, fertilize once a month during growing/flowering, and none during dormancy. Also use a fertilizer with a slightly higher middle number, like 5-10-5; the middle number signifies ratio of phosphorous in the mixture. Let me know how that works, if you can.