Somebody spent a lot of time swimming! Fins grow from the back and limbs, and a tail can extend from the back of their head! You may have any number of these on the witherling, they are not all required.
The smallest beans have earned themselves the rare trait of Teensy! When beanlings or blightlings, they are an average of 1.5 inches, or aproximately 2.5 centimeters, and grow to an average of 3 inches, or about 5 centimeters as flowerlings and witherlings.