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Quote from »tomaturge«

Typhonium venosum is certainly hardy in zone 7b, forgotten tubers in compost have grown overflowing into my tomatoes. Here in February the temperature dropped to -12.5°C.

I would be very careful to call tuber-forming plants hardy if their tubers had successfully wintered in the compost heap (ideal protection with built-in heating). In any case, it is certain that larger unprotected tubers of S. venosum do not survive even light frosts without damage . A frozen tuber is dead. Whereby the tuber does not have to freeze at all. It is already dead when the frost has caught all the buds, including the partly invisible reserve buds.

PS: Your Typhonium-venosum link is not working. Here, the thread does not have 8 pages thanks to the adjustable number of posts per page. In addition, even if the number remains unchanged, a page consists of more than one post. Therefore, please always link the contributions. The appropriate URL for this can be found in the upper right corner of the article under the number (copy the address via context menu [right click]).

Quote from »Dung Beetle«

I would be very careful to call tuber-forming plants hardy if their tubers had successfully wintered in the compost heap (ideal protection with built-in heating). In any case, it is certain that larger unprotected tubers of S. venosum do not survive even light frosts without damage .

Hardy will certainly be the technically wrong term. But they seem to be quite tough. There is a feral population on the edge of a beech forest near Herne (NRW).

Floristic newsletters (Flor. Rundbr.) 41 () Bochum 2008 A SPONTANEOUS OCCURRENCE OF THE LIZARD ROOT (SAUROMATUM VENOSUM [AIT.] KUNTH) IM RUHRGEBIET - PDF Free Download (docplayer.org)

Hello everyone,

the article to which dung beetles refers with the link concerned tubers lying unprotected on the lawn; but at one location in my garden IG have sprouted again and have about 50-60 cm high leaves; so they survived the frost period in the last winter outside.
At the same location, however, a fat tuber has already frozen, but small (brood tubers?) have sprouted again.

At the location in North Rhine-Westphalia you also have to keep in mind that it is warmer there than e.g. 40 km east of Hanover.
IG is hardy in NL......

Happy growing, Bernhard.

In the sentence with the link, I also wrote about unprotected tubers. I actually just wanted to make it clear that the tubers do not tolerate frost and need protection such as compost heaps or an appropriate planting depth.

There was once someone on Facebook with an insulated cold frame embedded in the ground, which was covered in winter with a thick polystyrene board (10 or even 20 cm thick), which not only protects against cold, but also against moisture. A few days ago I read somewhere in an older post about someone who is said to have planted his konjac 70 cm deep.

Some plants that are considered hardy in our country are only so because they are planted deep enough so that frost does not reach the bulbs or tubers. Others, such as tulips and daffodils, do not tolerate at least the rapid multiple freezing and thawing, as inevitably happens when overwintering outside in pots or boxes.

Unfortunately, there is no more up-to-date report on the overgrown population near Herne. At least I don't know anything more up-to-date. It would be interesting to know if it still exists and if so, how it has developed.

Zitat von »Mistkäfer«

Ich wäre sehr vorsichtig damit, Knollen bildende Pflanzen als winterhart zu bezeichnen, wenn deren Knollen erfolgreich im Komposthaufen (Idealer Schutz mit eingebauter Heizung) überwintert hatten.

Ich war nicht klar genug. Die Knollen befanden sich im reifen Kompost, in Töpfen die in Freiluft und ohne Deckung, und sind trotzdem gewachsen.