The cattail, reed and bur-reed association is the cenosis-forming ones for a part of the mouth of the Kutum duct of the kultuk area of the Volga river delta. The insular area of the avandelta is characterized by reed–mace associations. The terrestrial and aquatic vegetation begins to grow massively in late May. The aquatic vegetation begins to die since the end of July whereas the terrestrial vegetation, on the contrary, reaches its maximum in this period.