Apple

(Heb. tappuah, meaning "fragrance"). Probably the apricot or
quince is intended by the word, as Israel was too hot for the
growth of apples proper. It is enumerated among the most
valuable trees of Israel (Joel 1:12), and frequently referred
to in Canticles, and noted for its beauty (2:3, 5; 8:5). There
is nothing to show that it was the "tree of the knowledge of
good and evil." Dr. Tristram has suggested that the apricot has
better claims than any other fruit-tree to be the apple of
Scripture. It grows to a height of 30 feet, has a roundish mass
of glossy leaves, and bears an orange coloured fruit that gives
out a delicious perfume. The "apple of the eye" is the Heb.
"ishon", meaning manikin, i.e., the pupil of the eye (Prov.
7:2). (Compare the promise, Zech. 2:8; the prayer, Ps. 17:8; and
its fulfilment, Deut. 32:10.)

The so-called "apple of Sodom" some have supposed to be the
Solanum sanctum (Heb. hedek), rendered "brier" (q.v.) in Micah
7:4, a thorny plant bearing fruit like the potato-apple. This
shrub abounds in the Jordan valley. (See ENGEDI T0001207.)