Creates the Lawns to Legumes Act. Establishes the Lawns to Legumes Program, which requires the Department of Natural Resources to provide assistance for installing pollinator-friendly native plants in residential lawns to protect and support native species of pollinators. Provides that the Department shall adopt rules for the Program. Provides for individual support grants to reimburse Illinois residents for up to $400, subject to appropriation and other requirements. Provides for demonstration neighborhood grants to units of local government and nonprofit organizations through a request for proposal process, subject to appropriation and other requirements. Provides that homeowners associations and common interest communities may not prohibit the planting of pollinator habitats. Defines terms.