How cold do you get? The weather trend lately will by moving lychee production further and further north.

Not sure on the jungle growth, maybe there is a website that will break down it's components and give you a PH. You could always wet down your mixture and get a reading yourself. I'm betting what you plan will work out fine...just make sure it drains quite well. You may want to add some large particle perlite to the mixture.

I am in a pretty cold area of FL in Ocala. I get a few nights a year where it gets down in the low 20's and last year even had a night in the upper teen's. I ended up planting it in the ground but I have a 10x10x8 portable greenhouse that I am planning on putting over it on the few cold days in the winter. I have a couple mangoe's, dragonfruit and a guava in pots that will go in there to. I am thinking about picking up another Lychee to try in a pot. I can not decide between Emperor and Hak Ip. Any suggestions? I know most sites say the emperor is best for containers, but it seems like the Hak Ip is better tasting fruit.