Amaranth (Amaranthus hypochondriacus L.) is a potential forage crop with a high yield and crude protein (CP) content; however, establishment methods need to improve for the crop to be less sensitive to typhoons. Optimal establishment, cultivation, and utilization in amaranth were examined in a variety of seasons and methods of establishment in 2021–2023. Four methods were examined: (1) direct seeding in rows, (2) direct seeding in spots, (3) soil seed balls, and (4) transplant pretreatment methods under a randomized blocked design (n = 3). Sowings every month from April to August were applied only in 2021, while establishments in April, May, and August with both pretreatment methods were applied in 2022 and 2023. The establishment in August successfully escaped damage from typhoons. The direct seeding of either rows or spots showed marginal success in establishment compared to stable establishment in pretreatment methods. In 2022 and 2023, the highest yield and CP content were achieved in soil seed balls plots in April and in both pretreated plots sown in August, respectively. The quality of silage fermentation showed a high pH, ranging from 4.52 to 6.39, due to the high CP content in 7.59–18.36% dry matter (DM). Sowing in April or August established with soil seed balls can avoid typhoon damage to have stable forage yields and can be processed with a favorable quality of amaranth silage in the region.

Amaranth (Amaranthus hypochondriacus) is a potential C₄ food and forage crop with high yield and quality, which is expected to improve quality forage supply in southern Kyushu region. However, the use of amaranth as a forage crop is limited in southern Kyushu, Japan. Amaranth was seeded in early May 2020 and 2022 to test its adaptability, yield, and forage quality. These characteristics were compared with those of four typical small‐grained forage species that is foxtail millet (Setaria italica), Japanese barnyard millet (Echinochloa esculenta), proso millet (Panicum miliaceum), and forage sorghum (Sorghum bicolor). In both years, the highest yield and the rate of crop growth were observed in the first harvest plants in the amaranth. In addition, amaranth also had the highest in vitro​ dry matter digestibility (IVDMD) and crude protein (CP) content in addition to the lowest neutral detergent fiber (NDF) content in 2020. Both IVDMD and CP content were lower in 2022, due to the fact that the crops were more mature at harvest, although NDF content was the lowest. Among small‐grained forage plants, forage sorghum had the second highest yield after amaranth and the highest IVDMD in first‐cut plants. The amaranth crop was extensively damaged in 2020, when 31.7% of the crop was lodged by a strong wind from typhoon No. 5. Compared to conventional small grain forage species, amaranth has the potential for high forage yields and quality. However, protecting amaranth plants from typhoon damage requires further study.