Sugar Apples: Annona squamosa
Sugar Apples (Annona squamosa) are the most widely cultivated member of the Annonaceae family. Sometimes called "Sweetsop", as distinguished from "Soursop" (Annona muricata, aka Guanabana or Mang cau).
Sugar Apples are a native of the tropical Americas and West Indies, is a heart-shaped fruit about 2-4" in diameter, and are typically pale green to blue green in color w/ a deep pink blush on certain varieties.
Its exterior is segmented and tends to separate when ripe, exposing the interior. Inside are many small shiny dark brown seeds.
Flowering occurs in late spring to early summer and flowers are pollinated by nitidulid beetles, as bees can not reach the pollen. Hand pollination may be necessary in areas where the beetles do not exist.
Sugar Apples like it warm and humid. Optimum growing conditions are 74-93 degrees, with 70% humidity or more, and possibly wind protection. Protect from frost, though mature trees can tolerate short spells of temperatures down to 29-30 degrees.
Sugar Apples rarely exceed about 15-20' in Florida.
Photo courtesy of wikipedia: By J.M.Garg (Own work) [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC BY-SA 4.0-3.0-2.5-2.0-1.0 (http://creativecommons.org/licenses/by-sa/4.0-3.0-2.5-2.0-1.0)], via Wikimedia Commons
A few recently introduced cultivars from southeast Asia have been found to be more reliably self-pollinating for Florida: Thai Lessard & Na Dai are two of the best that are easily obtainable.