Acorus (Araceae)
The Acorus genus, native to temperate and cold waters, is widely distributed
outside its original breeding grounds. It will not tolerate temperatures over 22°C
and is therefore exclusive to temperate aquariums. These plants reproduce by dividing
a rhizome between the buds. They are generally paludal (marsh plants) and are equally
suited to aquaterrariums and garden ponds, although they will also survive totally
submerged.
Acorus gramineus
There are two varieties of this species. The biggest, the green acorus, grows
to a height of 30 cm; the smallest, the dwarf acorus, at around 10 cm, is ideal
in foregrounds.
Acorus calamus
The sweet flag or muskrat root is found in Europe. As it can grow to a height
of over 1 m, it is reserved for garden ponds.
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