The flourishing of the seagrass, Zostera marina, was performed by using artificial seeding method on a polypropylene mat. The commercial mat as 'sediment stabilizer mat' was used to decrease sediment disturbance on the sand substratum off Kushiki, Naruto, Tokushima. The polypropylene mat (1mx1m, 4cm, 23 and 31kg of weights) were made of pemeable meshes. The plants of Z. marina seeded on the mats, flourished successfully for one and half years under the terrible environmental condition at 2m (H1/3) wave height and 10 cm fluctuation of the natural sand bottom level in the winter season. Its shoot density on the mats was observed to decrease after maximum individual shoots (87 shoots/m2) in the first summer season. Such monitoring of growing Z. marina plants on the mats is required for promoting the methodology establishing seagrass beds.
