This is the result of manual processing. It turned out that when watermelons or gourds were born, they were all surrounded by boards and forced to grow into squares.

Why do breeders try to cultivate square varieties?

Square wood can reduce the loss of building materials. Square tomatoes can be easily picked by machinery, which can improve the speed and quality of picking. Square watermelons grow melons in boxes, so don't worry about pests. Squash is small in area, does not roll, and is convenient for transportation. In addition, the square melon is small and exquisite, and its texture is beautiful, so it has become a popular gift.