I have used Miracid and some Iron fertilizer on the gardenia plant. All it does is get fuller and bushier. It gets sun and humidity and water regularly. What else can I do?
Gardenia Not Blooming
Certified GKH Gardening Expert
Give it some bone meal. That will add phosphorus. Gardenias that have too little phosphorus will look lush but will lack flowers. This article will give some other tips: https://www.gardeningknowhow.com/ornamental/flowers/gardenia/gardenia-care-to-get-a-gardenia-bush-to-bloom.htm