Overview
Anna apple is a dual purpose cultivar of domesticated apple that is very early ripening and does well in warm climates.
History
Anna was bred by Abba Stein at the Ein Shemer kibbutz in Israel, in order to achieve a Golden Delicious-like apple, that can be cultivated in nearly tropical areas. A regular apple needs between 500 - 1000 hours of chilling (aka chill units) in order to get in blossom, but Anna flourishes even with less than 300 hours, so it can be grown in warm climates. It is recommended for USDA hardiness zones 5–9, or rather 6–9.
Anna was introduced to the United States in 1959, and is the most popular apple cultivar in Florida.
Description
From Wikipedia (CC BY-SA 4.0).