I lived with my brother for 10 years with unknown green fig, There was no caring or whatever for this fig tree, However, This 17 year old Tree grow to 25ft height by 30 FT wide, During that 10 years, I never been able to taste any sweet rippen figs, its tasted so bland like nothing as all, Even mouses/birds did not care to eat it, This year, I got some free " Sheep manure" from farm, I put down 100+L sheep manure under this fig tree at July plus let faucet water ran on it for 30 min, at September, My brother called and told me that his figs tree had couple thousands sweet figs, it was very sweet, Even Squirrels jumped from roof to tree to eat it.
Good fertilization and moisture levels will insure quality fruit, also, Tree needs strong sun to sweet up its rippen figs.