About a week. Nodule vegetables are root tuber vegetables, Junda vegetables and Eleocharis tuberosa, which are Chenopodiaceae 1 to 2-year-old herbaceous crops. After the temperature began to drop to 10 in August, the root vegetables were sown in the south by direct seeding combined with intercropping. The seedling growth period was 30-40 days, and the seeds could be produced about one week after flowering, and they could be sown again after harvest.