How do you tell maize is ready for harvesting?

Maize is ready for harvesting when the kernels are firm, plump, and have reached their mature color, typically a deep yellow. The husks will become dry and brown, and the silk at the top of the ear will turn brown and dry out. Additionally, you can perform a "dent test" by pressing a kernel with your fingernail; if it leaves a dent and the liquid inside is milky or starchy, the maize is ready for harvest. Harvesting is usually done when the moisture content of the kernels is around 20-25%.