What value on the starch scale indicates a mature Granny Smith apple?

The starch scale is a method used to determine the maturity of apples, including Granny Smith apples. A value of 2.5 on the starch scale is indicative of a mature Granny Smith apple. At this level, the starches present in the apple have begun to convert to sugars, which is essential for optimal flavor and texture. This conversion is a sign that the apple has reached a point where it is ready to be harvested and consumed.

Lower values on the starch scale, such as 1.5 or other options, would indicate that the apple is not fully mature, meaning it may be less sweet and have a firmer texture. Conversely, values substantially higher than 2.5 could indicate overripeness, which may affect the apple's quality and flavor negatively. The value of 2.5 strikes an ideal balance, representing the right stage of ripeness for a Granny Smith apple to be at its best for eating or cooking.