The leaves on my potted gardenias are turning yellow. What is wrong?

Question

I have changed them to a larger pot, put in gravel at the bottom, added more soil, and placed them in a semi shaded spot on my front porch.

Answer 1

There are quite a few reasons why this could be happening. This article will help you to address those issues: https://www.gardeningknowhow.com/edible/helping-a-gardenia-bush-with-yellow-leaves.htm