The quick and convenient step by step guide to growing your very own Blue Joint Grass Seeds A valuable wetlands restoration species, this grass is the most frequent associate of sedges. It grows into a dense patch of grass with lots of fibrous roots, so it is an excellent option for strengthening stream banks or shoreline restoration work. Growing Blue Joint Grass Seeds! # 1 | Direct sow either in late fall or early spring. # 2 | Plant the seed just below the surface of the