I've had this plant for over a year, exact same spot and as it has always been, plenty of sun. Recently all the leaves have turned a spotted yellow, I'm not so sure what is going on. I just fertilized it recently. Could the fertilizer be causing this? Or is there another reason? It has not been overwatered

Maybe too much sun and not enough moisture. I have transplanted mine and it has not rained. The leaves are turning yellow also. I did not fertilize because of the lack of rain. The ones still in pots and under trees are still doing fine.