What fertilizer should I use in the soil for gardenias?
What Fertilizer for Use on Gardenias
Certified GKH Gardening Expert
A balanced fertilizer will work, but keep in mind that these plants do best with acidic soil. Therefore, you'll want something that is aimed at acid-loving plants. This article should help: https://www.gardeningknowhow.com/ornamental/flowers/gardenia/fertilizing-gardenias-in-your-garden.htm