Greenhouse Tunnels South Africa Company greenhouses are used for all applications incl. propagation, flower growing, produce farming, hydroponics & nursery. All of our greenhouses are constructed of a framework of high grade, galvanized steel. Strength and durability is guaranteed by using heavier gauge steel legs concreted into the ground, arch bars, bracing and gutters. Functionality is the key when designing your greenhouse. Many options are available including ventilation, winch operating systems and internal thermal screens. A range of plastics from 150 to 200% is available to suit all horticultural and agricultural requirements. Plastics and shade cloth is fixed using an advanced spring clip system. The system speeds up the construction process, and enables fast repair, replacement or disassembling for relocation.