Upon receipt of a petition for the organization of a noxious weed control district the board of county commissioners wherein the petition is filed shall make an order setting the date for the hearing of the petition. The petition may be considered at a regular or special session of the board of county commissioners of the county wherein the petition is filed. The board shall issue a notice of public hearing to be published in a newspaper or newspapers of general circulation in each county in which the proposed district lies at least once a week for two consecutive weeks, with the last insertion of the notice not less than thirty days prior to the public hearing.