D. Christopher Rogers
EcoAnalysts, Inc.
1.530.383.4798
PO Box 4098
Davis, CA 95616
((,///////////=======<
________________________________
From: aroid-l-bounces@gizmoworks.com [aroid-l-bounces@gizmoworks.com] On Be
half Of StroWi@t-online.de [StroWi@t-online.de]
Sent: 22 February 2010 22:54
To: Discussion of aroids
Subject: Re: [Aroid-l] Temperature requierements for Helicodiceros
Dear Christopher,
thanks for your input.
Your observation that Helicodiceros stops the growth until they get low tem
peratures would indicate a sort if cold requirement for the "normal" growth
cycle.
It would be intersting to see what would happen if one of these plants woul
d be shifted to a greenhouse where temperatures would not drop.
Maybe we get a reply by a fellow aroider who grows Helicodiceros (or tried
to grow Helicodiceros) above 15 or 20 C° all year round.
Then there is still the question, if the species needs the low temperatures
to induce flower development in a meristem. Or in other words, if it would
never flower, if kept at high temperatures.
Happy growing,
Bernhard.
-----Original Message-----
> Date: Mon, 22 Feb 2010 18:11:03 +0100
> Subject: Re: [Aroid-l] Temperature requierements for Helicodiceros
> From: Christopher Rogers
> To: "'Discussion of aroids'"
>
Hello, Bernhard!
My experience is that Helicodiceros goes dormant in response to high temper
atures and lack of rain, while dormancy is broken by the cold of winter, bu
t occasionally from the onset of rain. My plants will break dormancy and s
tart to grow in the autumn if I water them, however, they stop growing just
below the soil surface. Once the temperatures drop down around freezing, t
hey begin growing past the soil surface and into the full vegetative stage.
I hope I am answering your question. Please let me know if I am still miss
ing your point.
Happy days!
Christopher
D. Christopher Rogers
Senior Invertebrate Ecologist/ Taxonomist
((,///////////=======<
branchiopod@gmail.com
EcoAnalysts, Inc.
1.530.383.4798
P.O. Box 4098
Davis, CA 95616
USA
Invertebrate Taxonomy
Endangered Species
Ecological Studies
Bioassessment
Invasive Species
Plankton
Phycology
IDAHO LIFORNIA SSOURI NNSYLVANIA NCOUVER
WWW.ECOANALYSTS.COM href="mailto:ECO@ECOANALYSTS.COM">ECO@ECOANALYSTS.CO
M
From: aroid-l-bounces@gizmoworks.com [mailto:aroid-l-bounces@gizmoworks.com
] On Behalf Of StroWi@t-online.de
Sent: Thursday, February 18, 2010 11:04 PM
To: Discussion of aroids
Subject: Re: [Aroid-l] Temperature requierements for Helicodiceros
Aroiders,
thanks for your replies to my inquiry and sorry for my late reply….
It seems that Christopher is lucky to have the right mediterranean climate
for Helicodiceros.
Dan’s experience seem to indicate that successful growth under artificial
light is not possible.
The different experiences with the hardiness in zone 6 made by Steve, Tony
and Jim W. might have to do with the very growing conditions. Growing it on
a sloped bank in JimW.’s case might help to keep it dryer in the cold se
ason and the necessity of hot summers as indicated by Tony might be another
important point.
I live in zone 7 (near Hannover, Lower Saxony, Germany) and planted some sm
all offsets outside last autumn and will see what comes out of it this spri
ng, but having a cold winter with frost down to –15 °C (5 °F) I do no
t expect too much.
Susan’s comments about growing it in a cold greenhouse, seem to show that
those conditions are not suitable to bring Helicodiceros to bloom in cold
wintergarten.
However, it might be possible.
You might have a look at this site:
http://culturesheet.org/araceae:helicodiceros:muscivorus
From the pictures it looks like a cold wintergarten and I hope that I can g
ive my plants similar conditions.
This season I used deep pots and a rich organic based potting mix as recomm
ended by the culturesheet description and the plants never looked so good b
efore (see picture).
From my initial request there is one point still in question:
Does Helicodiceros need the colder temperatures for the switch from vegetat
ive to generative growth, in other words, is there a cold requirement for t
he induction of an inflorescence?
Still curious, and thanks again to all of you who replied,
Bernhard.
From: aroid-l-bounces@gizmoworks.com [mailto:aroid-l-bounces@gizmoworks.com
] On Behalf Of StroWi@t-online.de
Sent: Wednesday, January 27, 2010 1:29 AM
To: aroid-L
Subject: [Aroid-l] Temperature requierements for Helicodiceros
Aroiders,
from the temperatures and seasonal rainfall on Sardinia I guess that Heloco
diceros grows from late Sebtember to April or May with the maximum of rainf
all in November and December and temperatures down to 8 œC (46 œF) in D
ecember to February.
I would like to know, wether the low temperatures in the growing season are
neccessary or if Helicodiceros could be grown (and flower) at higher tempe
ratures as well.
Looking forward to any comment,
Bernhard.
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