Q.Gerbera daisies stopped blooming
Last year I planted several daisies and they flourished with healthy bright green leaves and bloomed all year long through the spring, summer, fall, and winter. (Subtropical climate). In March of this year they stopped blooming even though I regularly deadhead and have fertilized. The greenery looks very healthy, but no flowers.
What can I do?

Certified GKH Gardening Expert
If they receive too much nitrogen, it can cause nice leafy plants but inhibit flowers.
Without a soil test it can be a guess; you can give them a boost of phosphorous in the form of bone meal to help promote flowering.
https://www.gardeningknowhow.com/ornamental/flowers/gerbera-daisy/growing-gerbera-daisies.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/bone-meal-fertilizer.htm
If the problem persists have your County Extension Office help with a soil test.
https://www.gardeningknowhow.com/extension-search