Arisamea ringens is a distinctive species, and unlikely to be confused with any other. It is an excellent garden plant, being hardy and reliable, and has a long flowering period before the spathe withers away. Large clumps can be established over a few years.
The spathe has a very tightly recurved hood which folds down over the mouth, so much so, that it can be difficult to see inside. This recurved spathe hood makes Arisaema ringens unmistakable compared to other species, even when compared to others that have a recurved spathe hood such as Arisaema galeatum. The base colour of the spathe is a pale creamy green with vertical stripes and prominent raised ridges. This is complimented by deep chocolatey / maroon stripes and colouring around the spathe mouth and auricles. Green forms are also relatively common, as are intermediate colour forms.
Plants are either male or female.
Each tuber produces two trifoliate leaves on a short pseudostem loosely wrapped in large cataphylls. These leaves are usually a distinct glossy green, although occasionally specimens with a more dull matt appearance are seen. The leaflets sometimes end in a pronounced pointed tip. Petiole colour can vary from green through to a dark grey or brown.
Arisaema ringens seems reliably hardy, although it can be an ‘early riser’ and care needs to be taken to protect it against late spring frosts. Given it’s rather warm and frost free habitat in Japan, its hardiness is surprising.
The tuber is subglobose and can reach quite large proportions, reaching around 10cm in diameter, perhaps a bit more. Sessile offsets are produced from mature tubers. These are not hugely abundant, but typically 3 or 5 per year. These can measure a few cm in diameter.
Seeds and germination:
Seeds can be stored dry with no significant loss of viability.