Help! Rose of Sharon Leaves are Yellowing
I'm growing a Rose of Sharon tree in a container and the leaves are turning yellow and some of the blooms have fallen off and some look like they're dry. It's definitely not from lack of water. I've been watering it regularly and fertilizing it. The soil is a combination of soiless mix with compost. It's getting a decent amount of sunlight. I can't figure out what I'm doing wrong.
I live in NYC and have the tree on my terrace which has a North East exposure. The rest of my plants are doing just fine. Any advice will be appreciated. Thank you.