Any person, firm, association or corporation who maintains sales yards, stores, garden centers or any place where nursery stock is sold, must keep such stock stored or displayed under conditions which will maintain its vigor and it must be prevented from becoming devitalized or weakened by drying out or by excessive heat or cold. Only sound healthy nursery stock stored or displayed under conditions which will maintain its vigor may be offered for sale. Any duly authorized inspector of the Department may order the removal from sale any nursery stock which is not viable or is in such damaged or desiccated condition as to be incapable of reasonable growth.