[Aroid-l] Cold hardiness of Typhonium horsfieldii

**V* S* <s*@email.uc.edu>**

Hi,

	Every once in a while the subject of cold hardiness comes up in

discussions of particular aroids. I want to add one example based on my

own experiences.

	I received several years ago from Chen Yi some tubers of Typhonium

horsfieldii, which were potted. Three years ago I placed several outside

on a northwest-facing mesic, calcareous, hillside under mixed deciduous and

hemlock trees. These plants continue to grow (no blooms this year yet)

even though this was a very cold winter with one stretch of 10 degrees

below freezing F of three weeks. Cincinnati is considered as Zone 5/6,

maybe in protected sites, 7.

Typhonium venosum (Sauromatum venosum) regularly goes through our winters,

but showed some die back this year.

	Has anyone else tried other Typhoniums (other than giganteum or

diversifolium) outside, and if so, with what results?

Vic

Victor G. Soukup PhD
Herbarium
University of Cincinnati

Cincinnati, OH 45221-0006

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