Nice pot but not what I'd consider very appropriate for your trees. You might be able to do the red laceleaf in this for a season but that's about it. The Aconitifolium is too big already and will only get bigger.

I grow all of my JM's in containers and I tend to err on the generous side, simply because I am not fond of root pruning or repotting too frequently. It would help to know the rootball size now - I tend to pot up 1G plants into 2 or 3G containers right away and leave them for a couple of seasons. I then move them up to larger containers for a more permanent home - typically something at least 20-24" in diameter and close to the same depth.

One other factor you want to think about - in addition to being an adequate size for the root mass, you want your containers to be of appropriate scale or proportion to the tree - too shallow a container looks weird for a taller tree. Like a bonsai that has run amok!!

Thanks for the advice gardengal, a larger size is probably better. I just ordered this from Rite Aid, all their garden stuff is 50% off with free shipping now.

http://www.riteaidonlinestore.com/Marchioro-USA-Inc-Osaka-Planter/dp/B008MOMFHC?field_availability=-1&field_browse=3003305011&field_keywords=planter&field_product_site_launch_date_utc=-1y&id=Marchioro+USA+Inc+Osaka+Planter-&ie=UTF8&refinementHistory=brandtextbin%2Csubjectbin%2Ccolor_map%2Cprice%2Csize_name&searchKeywords=planter&searchNodeID=3003305011&searchPage=1&searchRank=salesrank&searchSize=12