Could be many clues in the Insight book...
Insight vol. 1
pp.830-831 FigEarly
andLateCrops. There are, basically, two crops of figs produced annually by the trees: the first ripe figs, or early figs (Heb.,
bik·ku·rah´), which mature in June or early July (Isa 28:4; Jer 24:2; Ho 9:10), and the later figs, which grow on the new wood and make up the main crop, generally maturing from August onward. The early figs may be easily shaken from the tree when ripe, and they are prized for their delicate flavor.—Na 3:12.
About February, the first fruit buds appear on the branches from the previous season, and these precede the leaves by about two months, since the leaves do not usually appear until the final part of April or in May. (Mt 24:32) At Song of Solomon 2:13 the first signs of maturity in the new green figs (Heb., pagh) are mentioned in connection with the flowering of the grapevines, which flowering begins about April. Hence, by the time the tree is in full leaf it should also be bearing fruit. The fig tree that Jesus Christ cursed seems to have been abnormally early with its leaves, inasmuch as it was then Nisan 10 of the year 33 C.E. Its appearance gave basis for hoping it might also be unseasonably early in producing fruit suitable for eating, and the record at Mark 11:12-14 indicates that Jesus approached the tree with that thought in mind even though "it was not the season of figs," that is, the time for the fruit to be gathered. The tree’s having nothing but leaves showed it was not going to produce any crop and was, therefore, deceptive in its appearance. Jesus cursed it as unproductive, causing it to wither.—Compare Mt 7:19; 21:43; Lu 13:6-9.