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As Indian jujubes are tropical, you might have more luck asking that question in the tropical fruits section.
Absolutely not. They don't tolerate frost. They are also less tasty compared to Chinese jujubes according to most people.
Probably, but I don't know as I've never grown Indian jujubes. Chinese jujubes are among the easiest plants to grow. You can prune it to maintain its size, but other than that you literally just let it grow and water occasionally.
I brought 2 Indian Jujubes from a private collector this year and they are fruiting right now. From what I were told, Indian Jujube fruit is remain green, sweet, crunchy and crispy. The size is like an egg or bigger if fertilizer right. Required heavy pruning after harvest the fruits which around April because flowers come from new branches. Flowers season around Oct.It is very hard to Air-Layer, best graft on a rootstock.Here is a pic of my fruits as today. They are in a 7 gal now.