Q.Why Has My Hibiscus Stopped Blooming ?
My two hibiscus plants are in pots by pool in Houston Texas extreme heat. I water daily.
Certified GKH Gardening Expert
It could mean they need fertilizer if you haven't been fertilizing. You can use a slow release fertilizer which will lightly fertilize every time you water. Something like 20-20-20 would work. Also check for aphids or spider mites. If the pots are drying out quickly, watering twice a day may be needed. Also be sure they are getting six hours of sunlight a day. Here is more:
https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/hibiscus-container-care.htm