because lack of NPK(Nitrogen, Phosphorus and potassium). Or might be in temperature the tropical areas are the good for the planting not in cold and extreme hot areas.....
The eggplant (also called an aubergine) got its name back in 18th century Europe from the farmers who grew them, because some varieties of eggplant actually look like off-white/yellowish goose eggs....
The original aubergine was quite small, white and looked like an egg. Plant breeding over the centuries has produced aubergines which are much larger and in a variety of colours, plum purple , white,...