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No need to rootstock this particular species. There are reports that it flowers at the 3 year mark and can fruit the next year. Taste reports on this one is that it is one of the best tasting myciaria. I grow 20 of them and keeping them all. They are beautiful and the taste report I got is from someone I trust.
Use whatever rootstock you have available . Sabara are most common. It's not roxa pulpa ...and it's much different than sabara. I'm going to try sabara but just by the looks seems like they would be too far apart in relationMy largest Roxa Polpa is 5 years plus and not close to fruiting.
Try m. glazioviana. It's the most available myrciaria and seems pretty durable and easy to care for. I believe Adam from FFF grafted a couple different myrciaria to it. Good luck