The general assembly finds and declares that the human needs and enjoyment, the interests of science, and the economy of the state require that rare plants throughout this state be protected and conserved, and that their numbers be maintained and enhanced; and that propagative techniques be developed for them to ensure their perpetuation as viable components of their ecosystems. However, nothing in this part shall be construed to limit the rights of private property owners to take rare plants from their own lands or to manage their lands for agriculture, forestry, development or any other lawful purpose.