Richard Frost's Top Plant Recommendations: Favorite Subtropical Fruit Trees for Southern California.
Sue Belle Sapote - Casimiroa edulis 'Sue Belle'
This is a new-world subtropical but a relative of citrus. The fruit is the size and shape of a small round apple. It tastes like a pear crossed with banana. Pick fruit when soft. Bears nearly year-round - a prolific cropper.
Big Jim Loquat - Eriobotrya japonica 'Big Jim'
Great tasting fruit. Variety 'Big Jim': High quality orange-yellow fruit; vigorous, upright, highly productive tree.
Vista White Loquat - Eriobotrya japonica 'Vista White'
Variety 'Vista White': small to medium-sized roundish fruit, very high in sugar content, excellent for dessert.
Avocado - Persea americana
What is not to like about Avocados! Plant types A and B together for best results. Additional Details
Babaco - Vasconcellea cundinamarcensis x stipulata
Unusual form of Papaya, grows only 4 to 6 feet high, produces about a dozen seedless papaya-like fruit. Suitable for pots.