Hello!
My parents have recently been interested in growing more fruiting bushes and trees in their backyard, and I've been helping them research which plants might work best for them. We've got about 2,000-3,000 square feet in a south-facing backyard--not exactly enough room to grow many larger trees, which is why we're more interested in larger berry shrubs or smaller trees to get a greater diversity. We live in a frost-free environment in the South Bay, CA (west of San Jose) and the passionfruit vine and dwarf mandarin in our yard seems to be growing well, as reference for what we've been able to grow. Some things that they are looking for are that they produce fruit quickly (starting within 1-2 years) and are heavy producers, though they particularly value the former trait.
Right now, I'm thinking that things like thornless blackberry, raspberry, gooseberry, mulberries, perennial ground cherries, or low-chill blueberries. There are other berries that seem interesting, namely currants, elderberries, and honeyberries, though I'm not sure how they would fare in California Zone 9b/10a since most information seemed to be geared towards colder zones. Outside of those, I have heard that pomegranate, figs, and guavas are relatively fast-growing and fruit in around 1-2 years, but I'm uncertain about the viability to growing plants as tropical as guava or papaya. When I've been looking at what's being sold in some nurseries around where we live, there are just so many varieties available for some of them, which is why I'm hoping to get some input on what varieties have worked well, in that they produced heavily and/or started fruiting soon, for people living in zone 9/10, particularly with those that share a similar microclimate to SF Bay Area CA. Apologies if it seems like I'm throwing everything at the wall and hoping to see what could work, so any assistance would be greatly appreciated.
Thank you!