Arnold posted a picture of Arum korolkowii grown indoors in New Jersey, USA. I don't think you have to coddle this plant so much. I have it growing outdoors, flowering and setting masses of seed, where winter temperatures are probably about the same as at Arnold's place. It is very tolerant. The foliage is winter-growing but withstands all kinds of frost, ice, snow, etc. Jane McGary Northwestern Oregon, USA