Here's that thread I mentioned earlier, looks like it was a custard apple in a 3gal pot, and it doesn't look like it was growing into the ground the best I can tell. http://tropicalfruitforum.com/index.php?topic=14385.msg194694#msg194694
The Annona in the pot is legit, no roots have escaped under my watch, it's been id'd as A. reticulata and flowered last year. Almost everything in the polyhouse is grown in hydroponic cultures of differing methods. I can get much more tree bulk and faster growth over growing in soil based mixes. Now trialing Soursop, Rollinia, Gacinia's, papaya, amongst others.
Pictured are a seedling soursop and the A. diversifolia seen in previous posts, only this time in an upsized pot.
Pics won't upload.