SINGLE—SPAN SEEDLING GREENHOUSE In addition to large greenhouse complexes single—span seedling greenhouse may be installed. They are suitable for greenhouses up to 10 hectares in total, and their area can be 100 – 300 – 500 – 1000 m 2 . Greenhouse specification is easy to handle, and very affordable. Seedling trays are installed inside the greenhouse. In one square meter of greenhouse holds up to 400 seedlings, so 100 m 2 greenhouse can fully provide seedling for up to 2 hectares greenhouse.