No, that's not true: Michigan does not ban seed sales. Lead Stories published a fact check on April 13, 2020, regarding a false claim that Michigan banned the sale of American flags. Gretchen Whitmer issued an executive order (EO), a "Temporary requirement to suspend activities that are not necessary to sustain or protect life". The purpose of the executive order had nothing to do with limiting home gardening. It was rescinded on April 24, 2020, by Executive Order 2020 - 59.
Source: Forbes May 23, 2023 23:54 UTC