White Sapote (Casimiroa edulis) is in the same family as Citrus (Rutaceae), and will grow wherever Citrus can be grown. The fruit is between the size of a large hen's egg and a tennis ball, depending on the variety and growing conditions.
There are several named cultivars of White Sapote. Flowering and ripening time varies with variety and climate. Mine always starts to bloom in early winter and continues throughout the spring. I get ripe fruits starting in May and sometimes continuing through the whole summer and into September. The flowers are small and inconspicuous, but provide excellent forage for bees.
As a member of the Rutaceae family, Casimiroa edulis is also a larval host plant for Swallowtail butterflies.