Abstract: The present invention relates to a system for promoting the growth of plants under less than optimal climatic and lighting conditions, the system comprising a device which contributes to the formation of an enclosed space over the plants, and at least one source of light. A special characteristic of the invention is that the device which contributes to the formation of an enclosed space over the plants consists of a flexible tarp (1) which comprises integrated lighting sources (6), the flexible tarp (1) being kept up at an optional height over the plants by means of excess pressure built up under the tarp (1) by means of an excess pressure system (5).