Eleocharis Belem also known as "Japanese Dwarf Hair grass" is probably the shortest hair grass available on the market today. It is a popular foreground plant that grows very short and does not need frequent trimmings.
Fissidens Nobilis
Hemianthus Micranthemoides
Monte Carlo (Micranthemum Tweediei)
Staurogyne sp. 'Porto velho'
Hydrocotyle Tripartita "Japan"
Gratiola Viscidula
Micro Sword (Lilaeopsis Brasiliensis)
Hairgrass Dwarf (Eleocharis Acicularis)