Abstract: A panel (10) for use as a side wall of a plant growth container is disclosed. In one embodiment the panel (10) comprises an elongate cuspated sheet (11) having apertures formed in at least some of the outwardly projecting cusps to facilitate air root pruning of the root structure of a plant grown within the container. The sheet (11) includes a non-cuspated edge section (12), the non-cuspated edge section (12) being co-operable with a complementary edge section (13) of the same sheet (11) or of an adjacent sheet. The co-operable edge sections (12, 13) form a guideway for holding means (32), the holding means (32) passing along the guideway releasably hold the edge sections (12, 13) in use form a side wall of the container. A plant growth container having at least one panel (10) as described is also disclosed.