Provide advice on how to accomplish the following goal. Give ONLY the advice, no other words or explanation.
For example:

Answer: <advice, as short as possible; a single sentence!>.

Goal: How do you determine when to harvest your cranberries?
Observe the berries daily in September and October of each year. The cranberries will be either bright red or dark red, depending on the variety of cranberry you planted.
Check for ripeness by gently pressing a berry - if it pops off the vine, it's ready.