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  Re: [Aroid-l] Temperature requirements for Helicodiceros
From: "Tony Avent" <tony at plantdelights.com> on 2010.01.31 at 15:46:31(20533)

As often happens, gardeners seem to have greatly underestimated the winter
hardiness of both Dracunculus vulgaris and Helicodiceros. Our former
research horticulturist Petra Schmidt brought clones of Dracunculus here
from her previous home in St. Louis, where she had grown them for many
years, so Zone 6b would certainly be fine and probably colder. We have had
numerous calls from Zone 6 areas of Tennessee over the years where
Dracunculus vulgaris grew fine. Helicodiceros have also been fine here for
more than a decade surviving temps to at least 6 degrees F with no mulch.
As with many plants from warm climates, they need good summer heat to
produce an adequate amount of sugars to fully develop their potential winter
hardiness. We are predicted to drop near 10 F tonight (we hit 9F last
winter) and a number of our helicodiceros are already up and growing, so we
may get some burned foliage, but the plants should be fine.

Tony Avent

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