----- Original Message -----|
From: "Tony Avent"
To: "'Discussion of aroids'"
Sent: Sunday, January 31, 2010 10:46 AM
Subject: Re: [Aroid-l] Temperature requirements for Helicodiceros
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.
Plant Delights Nursery @
Juniper Level Botanic Garden
9241 Sauls Road
Raleigh, North Carolina 27603 USA
Minimum Winter Temps 0-5 F
Maximum Summer Temps 95-105F
USDA Hardiness Zone 7b
phone 919 772-4794
fax 919 772-4752
"I consider every plant hardy until I have killed it myself...at least three
times" - Avent
From: email@example.com [mailto:firstname.lastname@example.org]
On Behalf Of Paul Temple
Sent: Friday, January 29, 2010 1:42 PM
Subject: Re: [Aroid-l] Temperature requirements for Helicodiceros (Susan B)
Iīve been silent for about a year as a result of some legal issues locall y.
However, the Helicodiceros question spurred me to break silence!
I used to live in the English countryside where winter temperatures often
fell below zero Centigrade, though not too much colder. My helicodiceros
plants (I had perhaps 30) survived these winters outdoors, below ground
(obviously!) at a depth of between 6 and 12 inches. Once mid-Spring arrived
(mid to late April), out they came, flowering annually once of mature
age. Once mid-summer arrived (August at latest), the heat dried off the
plants and they became dormant again.
So I would say that Helicodiceros is more hardy than is generally stated
(but it not reliably hardy so probably canīt take -5C or less for long
periods) while it is also not a heat lover, preferring dormancy once
temperatures reach about 25C for a prolonged period.
Of course, this was my experience for my plants in the South of England so
itīs only a guide, not a rule!
In the cool mountains of the Dominican Republic (but sadly with no
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