don't be afraid to prune the tree! The cold knocks them back sometimes in FL, and they resprout just fine...and fruit on new growth.
they are hard to kill once established...I'm sure they can handle coppicing.
I bet you have the same one I tasted, G. asiatica
http://www.hort.purdue.edu/newcrop/proceedings1999/v4-348.htmlhere is the info your looking for...from the link above
"
Culture and ManagementOne-year-old seedlings are usually spaced 2 to 4.5 m apart. Bushes flower progressively during the spring months.
Since phalsa bears fruit on current season's growth there is a need for regular but severe annual pruning before the on-set of spring. Annual pruning to a height of about 1 m encourages new shoots and higher yield of marketable fruit than does more drastic trimming (Singh and Sharma 1961). Gibberellic acid has been reported to improve fruit set and increase fruit size (Randhawa et al. 1959). The phalsa plant shows good response to nitrogen applications. High levels of phosphorus supply increase sugar content in the fruit while higher potassium suppresses sugar and promotes acidity. Phalsa is considered stress-tolerant and is commonly grown under neglect (Hays 1953)."
there's quite a few species..I've tasted the most common one in FL, and it's very pleasant to munch on. You can eat the fruit at various stages of ripeness, all being very tasty.
my friend grows a few of the harder to find grewia..and they are taking their time to flower. I'm interested in these plants! they seem easy to grow, and very rugged.
The branches grow very long and droop , I read somewhere one should prune them to 1 meter ?? Can you check with your friend what he does Adam ? No idea which one mine is .