For the purposes of sections 22-98, 22-99 and 22-100, any place at which hardy trees, shrubs and vines are propagated or grown out of doors for commercial purposes shall be considered a nursery, and such stock shall be regarded as nursery stock. Hardy herbaceous perennial plants, including strawberry plants, may be subject to the same provisions regarding inspection and pest control if, in the opinion of the State Entomologist, it is desirable to control the movement of such plants. Florists’ ordinary plants, unless woody and field-grown, shall not be included.