No, watermelons nowadays generally have red, yellow, pink, rose, green and white flesh. Moreover, the red pulp is the most, the yellow pulp is crisp and sweet, and the white pulp is rare unless it is unfamiliar. Examples of main varieties are as follows:

Redjade in early spring: It is a very early-maturing small pink watermelon.

Black beauty: oval, small melon shape, pure black skin and red flesh.

Special phoenix: round, with striped melon skin and yellow flesh.

Honey treasure: round, dark green peel, with waxy powder on the surface when mature, rosy, crisp, sweet and juicy.

New Jin Lan: Huangpi is a rare watermelon variety introduced from Taiwan Province Province.

Pepkino: This is a mini watermelon, a wild plant from South America. The flesh inside is turquoise.

White flesh: White flesh watermelon should be mature and edible, but the variety of watermelon is still uncertain.