Invasive plant species; retail sales; civil penalty. Requires, for the retail sale of any invasive plant species for outdoor use on a list established by the Department of Conservation and Recreation, a retail establishment to post in a conspicuous manner on the property located in proximity to each invasive plant display signage identifying such plant as invasive, educating consumers regarding invasive plant species, and encouraging consumers to ask about alternatives. The bill requires the Commissioner of Agriculture and Consumer Services to designate the format, size, and content of such signage no later than October 1, 2024, and requires the Commissioner to issue a stop sale order and mark or tag a plant in a conspicuous manner when an invasive plant is for sale at a retail establishment without appropriate signage. In such case, the bill requires the Commissioner to give written notice of a finding made to the owner, tenant, or person in charge of such retail establishment and requires the stop sale order issued to remain in effect until the required signage is posted. Any retail establishment that violates the provisions of the bill is subject to a civil penalty not to exceed $500. This bill is identical to HB 47.