In the introduction chapter it was claimed that greenhouse production has no longer arguments as a supply market. The products of the greenhouse industry became in free competition with those from field production from all over the world. In this competition the greenhouse industry has developed into a branch operative to a consumer market and through that self-condemned to bring better and cheaper products on the market than those from the open field. Many greenhouse products have a luxurious image, which even more is the case for flowers than for vegetables. That will be the reason that the critical view as exists on the production methods in agriculture in general, possible is even more critical on those used in greenhouses. Therefore, presentation of such products on a consumer market does not mean only high standards for quality, a great diversity and low prices, but also the production methods play a prominent part. Thus, greenhouse production will survive in future under conditions of sustainable production methods. This means low energy use, an effective use of raw materials and low environmental pollution.