Pine Island Nursery in Miami carries dwarf mangos in several varieties. They have a nice website and answer emails very quickly and courteously

i would recommend Rosigold. julie and rosigold are the smallest trees. rosigold will have a perfectly symmetrical upright canopy at 8ft. julie grows like a bush filling out nicely about 8 feet as well. both would be perfectly full grown in a 25 gallon container with a little pruning. julie is shy, but is an extraordinary mango and worth it IMO. Rosigold are very precocious, they give fruit a month earlier than almost every other variety. i think this may be beneficial to you as the fruit take less time from bloom to ripe. Nam Doc Mai is not a condo mango, it is a medium tree. i would grow it in at least a 45 gallon container and even then the trunk will become wider than the condo mangos and will be more top heavy. one reason Pine Island will not recommend Julie is because they stopped growing and propagating it after their trees died back of fungal problems. i personally know a dozen people growing Julie in south florida and while they do require minimal folier copper spraying to prevent anthracnose (black fungus), all of them enjoy their trees very much and prize the mangos they give. SPYKEs grove by me sells more Julies then any other variety fungus should not be a problem where you are.

1) Is it the rootstock or the scion that determines whether the tree is a dwarf? Since I'll be growing these inside, I want them to produce fruit at A)It's the scion not the root stock 2) If it is the rootstock that determines whether or not the tree is a dwarf, which rootstocks do you recommend? I've read that Turpentine is often used, but I don't know if it will result in a dwarf tree if I graft a scion onto it. A)Any root stock is fine to graft your Carrie scion onto.(but then again I could be wrong about this,maybe some one will correct me) Turpentine is mostly use in Florida nursery because it grows wild there and is more accustom to their soil. California uses manila(poly) root stock instead. 3) It sounds like polyembryonic varieties are true to seed, whereas monoembryonic ones are not. Therefore, if I want to purchase seeds to grow a tree to use as a rootstock, I'll need to purchase seeds from a polyembryonic variety, right? A)Polyembryonic mango grows true to the parent fruit it came from not the scion type you plan to graft onto. But if you still insist on growing a poly seed the easiest ones to find are the ataulfo mangoes. They are the small yellow kidney shape ones, which are usually found at the ethnic or specialty store. They can be called several names based on which company is marketing them ie: honey, manila, or champagne. The real manila mangoes are not the same as ataulfo. 4) I think I'd like to try using Carrie for the scion. Does this change which rootstock I should choose for grafting to result in a dwarf tree? A)I don't think root stock matters, it's the scion that will determine what kind of mango tree you will get. The're are many more condo/dwarf type to choose from not just Carrie(ie: cogshall, ice cream, pickering,) just to name a few. Make sure you do some research about which kind you would like flavor wise since the're are so many. Pine island nursery have a good variety viewer that gives a good description of the different variety of mangoes including the dwarf, check out their site. 5) If I grow a Carrie and want to propagate it, can I plant a seed from the Carrie to get a rootstock to start with, and then graft a scion from the mature Carrie onto the rootstock to result in a dwarf Carrie? A)Yes, you sure can graft a scion from your mature Carrie onto your Carrie grown seedling and still get a dwarf future plant because you are creating another Carrie and not a seedling plant. But if you grow out that Carrie seed to full mature tree it will no longer be a Carrie, but a Carrie seedling even if it's also a dwarf. check out the link, it might help you more and hopefully some more season fruit nut will come by to give their advise also. Here is a link that might be useful: pine island nursery

Those pots have a good size but i don't have experience with breathing pots like that. My pots are all closed. The roots sure get more air this way but i guess you'll have to water it every day or maybe twice a day in summer. In Bangkok you can buy mangotree's from 5-6 metres tall with fruit in a pot like this. They don't use these fabric pots though but shadingnet or weaved bamboo baskets. Mangotree's when young like nitrogen. If i give my potted mango urea then in 1-2 days it flushes. They are pretty strong tree's though but make sure you water them enough. In a big pot like this the tree's will grow more wide with sidebranches. If you prune the tips then you'll get a short wide tree which doesn't get blown over easy. Also big pots are less of a problem in case you forget to water them sometimes.