Culm

A culm was originally a stem of any type of plant. It is derived from a Latin root, culmus. It is now used mostly in its more technical botanical sense, where it specifically refers to the above-ground or aerial stems of grasses (Poaceae; including bamboos) and sedges (Cyperaceae).
Culm grassland is a specialised habitat consisting of purple moor grass and rush pasture largely restricted to the areas of carboniferous slates and shales of the Culm Measures in Devon & Cornwall in the United Kingdom. It is noted for a wide diversity of species, some extremely rare. Some 92 percent of culm grassland has been lost in the past 100 years, 48 percent being lost between 1984 and 1991.
Culm (city) - a German name for Chełmno
Culm was the old German name for a place in the former West Prussia. It is now known by the Polish: Czarze.
Culm is also a term used for fine-grained waste from anthracite coal preparation plants. It is mostly rock, but can contain up to 30 percent coal. Until the invention of the camelback locomotive and its Wooten firebox in 1877, this was waste of no commercial value.