Hi Brad - I felt someone should respond to your questions, though I am no expert on this. "They" say you can separate out the two sprouts with great care. Me - I would say for a rookie like you, can't you just leave them together and see how they each develop?

Since your "tree" is in a soda bottle (I hope you have drainage holes in the bottom....) you should be able to see the roots as they develop. I've heard mangoes develop a tap root, so, it is probably wise to transplant to a large container at some point (and then keep it up as the roots come out of that container at the bottom, and all subsequent containers). Once you reach a very large container, you can keep it in that by "root pruning" once a year or so. There is also something you can buy that will chemically prune (kill) the roots on the very outside, but can't think of the name of that product at this time.

Of course, to plant it in the ground you will get more growth and mangoes over time, but don't know where you are located or the amount of room u have. I'm also in 9B and they do well here, but I do have to cover the smaller ones in winter at any hint of frost....

Anyway, hope that helps....MDog

MDog
i am in New Orleans, the winters are pretty mild, but i probably will container it for at least a year, since i am not sure if i will be selling my house right now.
One reason why i asked, and had kept it in a small container, is cos ive seen mango seedlings in very small containers before, on youtube etc...
i know some plants have a long taproot, and if you stunt it,
the plant will be negatively effected forever

i wil probably put it in a larger pot very soon, so i will decide whether to keep both seedlings. if they come apart easily, or not, maybe i will cut the smaller one off.

It may make itself obvious what to do when i transplant anyway

thanks much
Brad