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Harvesting Agave for Tequila. I n the past, agave were harvested when the jimadors decided they were ripe enough. This was generally done when the agaves were from eight to ten years old. Jimadors knew, from generations of experience, when the agave was ripest, when it was rich with sugars and ready for harvesting.
Corn will display signs of ripeness when it is ready for picking. Sweet corn (Zea mays) grows in U.S. Department of Agriculture plant hardiness zones 4 to 8. On average, it takes 60 to 100 days to ripen, depending on the variety. Knowing the maturity date will increase the chances of plucking ears of corn with the best possible flavor.