As an edible stem vegetable (cultivar only, not the wildtype)
Colocasia gigantea grows as far north as about 35 degrees N. in Japan.
Here it is a summer crop that can be left in the ground over winter,
with mulch and soil to protect the apical tips from cold damage (can
survive this way under snow).
Under these conditions, it does not grow so high as in the tropics,
but it can still be a pretty plant.
Peter Matthews (Dr)
National Museum of Ethnology
Senri Expo Park, Suita City
Osaka 565-8511, Japan
Tel. +81 6 6876-2151 (museum)
Tel. +81 6 6876-8357 (Peter's office)
Fax +81 6 6878-7503 (museum)