It is the intent of the Legislature to partially restore the character of the original domain of Florida by planting native trees on state lands, and to this end all state lands shall have a portion of such lands designated for indigenous trees, to be established and maintained by the using agency with the assistance of the Florida Forest Service of the Department of Agriculture and Consumer Services. If the Florida Forest Service, or primary managing agency, determines that any state lands are unsuitable for this purpose, such lands shall be exempt from this requirement.