Material biodegradable horticultural and agronomic interest

The present invention relates to a biodegradable material horticultural and agronomic interest for the manufacture of a plant culture medium, consisting essentially of algae. The invention also relates to a support for plant cultivation consists of such a material and a method of manufacturing such a device conditionnement.A this purpose, a material for the manufacture of a plant culture medium, biodegradable and nutritious, according to the invention is characterized in that it consists of algae, especially of the genus Ulva, and a vegetable filler conferring mechanical strength properties to the material selected from lignocellulosic fibers or a mixture essentially composed of lignocellulosic fibers.