Help - Mandarin tree not looking so good
Hi, first post and my first attempt in raising citrus trees. I bought two mandarin trees, a seedless kishu and a tango from costco (W&N is the supplier). I have limited space in the backyard, so I decided on putting these semi-dwarfs in a container. With the seedless kishu, I transplanted it into a half wine barrel (deciding not to gradually move up container sizes. A person at my local home improvement store said I could use a layer of mulch on bottom, followed by half azalea mix for acid and half cactus mix for drainage (kellogg branded). I decided to see how it would go with the first transplant before doing the tango.
After a few weeks, the kishu doesn't look so well. After flowering, the tiny fruits turned yellow then black. The new leaves are looking more yellow-green than some of the older leaves. And recently, the inner, skinny leaves have turned yellow and are dropping. I water about every 3 days, is that too much? I thought the yellowing was due to nitrogen deficiencies so I added some miracle grow shake n feed for citrus trees. What am I doing wrong, please help, very new to this. Thanks in advanced!
Flower -> Yellow -> Black -> Falls off
Older vs. Younger leaves
Yellowing inner leaves
Tango still in nursery container