Kuitert, Japanese Flowering Cherries (1999, Timber Press) calls 'Kwanzan' an "obselete spelling", implying that at one time it was considered apt but not anymore. Place names do sometimes change over time. As a side note, Japanese flowering cherries of this type are thought to be hybrids rather than pure forms of Prunus serrulata.

I would love to have a cherry tree - we once saw in Plantersville, Texas a cherry tree loaded with cherries that were good. She didn't know the name of the tree but I hope you have great success with it!!

It's a nice tree. The only problem I see would be that pruning might be tough and eventually it might shade out the roses. Not really a fan of people who advocate to chop down healthy trees. But It's up too you but with or without the tree you are probably still going to have trouble with pests or diseases since it's all roses and once one gets ill it's easier for it to spread rose to rose to rose. And you will still get aphids and japanese beetles...they LOVE roses. If you do decide to get rid of the tree, it's not very big so think about posting an ad that if someone wants your ornamental tree they can come by and dig it up and give it a new home, plenty of people do this in my town and plenty of people have nothing against a free larger tree for their yard than what they get at a local box store. Also I would suggest if you are removing it, replace it with a tree or something that is not related to roses (no rose tree). Diversity is important for a garden, if something happens to your roses it likely won't spread to an unrelated tree but will to another rose bush. It's easier to replace a sick/dying rose bush than it is to lose an established tree that takes a long time to reach its full beauty.

Oh for heaven's sake!! Don't make more out of this than needs to be!! A Kwanzan\Kanzan or any other larger growing tree will not grow to full size in a container. That's what containers do - they naturally dwarf or stunt the growth of the tree due to root restriction. So you can grow them long term in a decently sized container but just do not expect them to reach optimal size. This is NOT bonsai and you are not trying to keep it to a tiny, miniaturized size like you would with bonsai but many of the care procedures are similar including pinching or pruning back topgrowth occasionally and periodic root pruning. Which you would need to do with any tree grown in a container. I know because I grow a great many trees in containers, several for as long as 25 years. But whatever you do, ignore comments about growing it indoors and under lights!! That is something you do not want to do!! You may get other, more appropriate advice on this topic if you were to post in the Container Gardening forum, where folks who do this routinely - grow large trees in containers - can contribute some meaningful information. Here are links to three threads from that forum's archives written by our resident expert that may further your knowledge and success. Trees in Containers Trees in Containers II Trees in Containers III