In fact, a crabapple fruit does not even have to taste sour; the only thing that makes a crabapple a crabapple is fruit size. Any apple less than 2 inches across is by definition a crabapple.

According to the Colorado State University Extension, Crabapple trees are closely related to apple trees grown for fruit. The main difference is that crabapple fruit is 2 inches diameter or less.

Crabapple fruit roll-up: While fruit leather is generally made in a dehydrator, you can make it at home in your oven too. Spread your applesauce thinly (1/4 inch high) on a baking sheet.