I have two scented geraniums growing in 4" pots. I bought them a few months ago, and they arrived in 2.5" pots. I repotted in pro-mix two weeks after they arrived. They spent a few months indoors and I recently put them outside and gradually introduced them to full sun. The apple scented is doing fine, but the coconut has had a problem with yellowing leaves since I purchased it. I treat both plants exactly the same. The newest and smallest leaves on the coconut are yellow, with brown edges. The edges look crispy. I've been fertilizing with dyna gro 7-9-5, 1/2 tsp per gallon once a week. What am I doing wrong??? Thanks for any help.