The invention relates to a plant based cellular system 10 for cladding or constructing a wall. The system comprises a cellular structural panel 12 with water retention pockets 18 and means 14 to direct water into at least some of the water pockets. The means to direct water is preferably a metal plate 14 which bears profiled apertures, clearly shown in Figure 3. The cellular panel may include a first pair of side interlocking means to enable the attachment and detachment of one cellular panel to an adjacent cellular panel. The system may be provided as a kit of parts. The purpose of the metal backing plate is to capture rainwater or condensation and to direct it towards the moisture absorbing growing medium for the plant roots, thus the system is not reliant on artificial irrigation for plant survival. However, the system may further comprise an irrigation system.
