Indoor-grown wheatgrass lasts from 10 to 17 days. It matures within 10 days of planting. A second round takes an additional six to seven days to mature. However, since the majority of nutrients come from the seed, any additional regrowth produces less nutritional value, tougher blades and an increased chance for mold formation within the growing flat.
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Based in Ohio, Deborah Waltenburg has been writing online since 2004, focusing on personal finance, personal and commercial insurance, travel and tourism, home improvement and gardening. Her work has appeared on numerous blogs, industry websites and media websites, including "USA Today."