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 (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.