Some photos of my emersed hairgrass and dwarf hairgrass. Growing them outdoor emersed is kind of like "unlimited" supplies of hairgrass for your aquarium. Emersed setup is quite straight forward and easy, as CO2 is already in the air. I use a plastic container because it can hold water to make sure the soil is wet most of the time. Just have to be careful with mosquito breeding.
Dwarf hair grass and Echinodorus Tenellus / Helanthium tenellum
Dwarf hair grass
Normal long hair grass