![enter image description here](https://i.stack.imgur.com/ZpZP4.jpg)

I bought a Black Pearl Wax Apple tree to grow in the Bay Area in California. This fruit is popular in tropical areas of Asia, but it virtually impossible to find in supermarkets outside of Asia. I've scoured Google for how to grow Wax Apple, but could not find any useful information.

1. What kind of soil does it like?
2. Is it self-fruitful or do I need to cross-pollinate?
3. Does it like to be pruned?
4. Is it deciduous and can it withstand winters of 45 degrees Fahrenheit at night?
5. How much light does it prefer?
['https://gardening.stackexchange.com/questions/8880', 'https://gardening.stackexchange.com', 'https://gardening.stackexchange.com/users/2709/']
From what I can see from my online research, it looks like you will need to find a way to give your wax apple tree more heat than it probably will be getting outside in the Bay Area, given that it's a tropical fruit and the Bay Area is more of a cool maritime climate. [Here is a gentleman in Southern California who, rather cleverly, warms his wax apple tree orchard by planting the trees in holes drilled into a cement or asphalt courtyard](http://www.latimes.com/food/la-fo-market-news-online-20130824-story.html), which is also surrounded by buildings that trap the day's warmth and reflect it back. 

If you could find or make a nice warm "micro-climate" for your tree, that would help a lot. Otherwise, you are probably looking at constructing a small "greenhouse" of sorts to hold it and raise the temperatures up to where the tree will be able to grow properly. The tree can grow to 50 feet tall, so the greenhouse option would only help it get started while young and small, and would not be practical after that. Luckily, larger trees are often more tolerant of less than perfect conditions. Overall, I think finding or creating a warmer microclimate, such as planting the tree in a south-facing courtyard, is your best bet. 

As for hardiness, it can withstand temps to freezing, but not for long periods. So a low temp of 45 in the winter should not be a problem. [The tree apparently can be pruned](http://books.google.com/books?id=cjHCoMQNkcgC&pg=PA555&lpg=PA555&dq=pruning%20Syzygium%20samarangense&source=bl&ots=u-WnbAZFUX&sig=DV-T-DzxBBcROZ5_105JEmKazpw&hl=en&sa=X&ei=UamtU9bXD5L-oQSTpICwBA&ved=0CEcQ6AEwAw#v=onepage&q=pruning%20Syzygium%20samarangense&f=false), but I would recommend against "bald cutting" or "pollarding" as it is harmful to the tree and unsightly as well. If you will scroll to the next page in the book page linked above, it actually has a fair bit of information on growing this species.
The grower that says any healthy soil is ok, is not familiar with some of the productive but alkaline soils in the USA such as in the Imperial Valley. The wax apple trees grow well in the mountains around Palm springs at about 3000 feet, BUT you must treat the soil to get it slightly acidic to acidic (5.5 is a good target).