A soilless system for high density plant growth includes a greenhouse structure; at least one elongate support member arranged substantially vertically in the greenhouse structure, the support member having a body having a flow channel defined therein; and a plurality of vertically spaced apart receptacles angularly disposed to the vertical axis of the body to receive a plant therein, the receptacles being in fluid communication with the flow channel; a fluid supply system in fluid communication with the flow channel to supply a fluid stream to the flow channel; and a fluid collection system to collect residual fluid that has flowed through the flow channel.
