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  arum question
From: tony at plantdelights.com (Tony Avent) on 2007.09.13 at 16:50:55(16280)

At the risk of encouraging the wrath of the tuberous aroid detractors
(probably phallus envy), I'm curious if anyone has had an Arum italicum
clump that refused to go dormant in the summer, despite three weeks of
100 degree temperatures. It's almost time for them to start re-emerging
and this one thinks it's still spring.

Tony Avent

From: abri1973 at wp.pl (Marek Argent) on 2007.09.14 at 10:41:49(16284)
The same with my Dracunculus vulgaris. Some days ago I noticed that it woke
up and soon it will put up a leaf.
I put the plant in a pot to a fridge, maybe it will prolongate its dormancy,
but I think it's too late and I will have to take him back and let it grow.
My Arum italicum often puts up leaves in autumn and they stay on the plant
during all the winter.
But Arum italicum is hardy in my area and Dracunculus vulg. probably not.

Marek Argent

From: crogers at ecoanalysts.com (D. Christopher Rogers) on 2007.09.14 at 15:55:23(16286)
Hello, Tony!

Maybe you are correct about the envy. But we must all remember that no
matter which aroids we enjoy, we are all "brothers in arums".

Yes, I have had that happen. It does not happen every year, but it does
happen. I have a bed of A. italicum on the north side of my home, right
under the condensation drip of my air conditioner. Additional shade is
provided by a 1.5 meter Tasmanian tree fern and lots of sword fern. Add to
that a top dressing of babies tears, and this one bed stays fairy cool and
moist. As a result, a small fraction of plants do not go dormant during the
summer about every three years or so. The plants that did not go dormant in
the summer always do in the autumn, and start poking up again mid winter. I
tried to recreate these conditions as an experiment and the tubers rotted.

As a side issue, I have had an A. palestinum ecotype from Mt. Carmel break
dormancy in July and August rather than December/January, but again not
every year. Also, I think that CJ Addington has had A. pictum bloom in the
spring rather than in the fall.

In that same vein, I have one Pinellia pedatisecta starting to come up. It
and all its buddies just went dormant a month and a half ago.


From: agoston.janos123 at gmail.com (Jan Agoston) on 2007.09.15 at 07:01:53(16294)
This is the same here...
And this means I shall replant my tubers. Immediately...


From: tony at plantdelights.com (Tony Avent) on 2007.09.16 at 00:15:44(16296)

I guess our Arums forgot to read the books. Now, there must be a good
reason why this happens.

> Hello, Tony!

From: crogers at ecoanalysts.com (D. Christopher Rogers) on 2007.09.17 at 16:04:19(16303)
Hiya Tony,

Yes I agree! I forgot to mention that the plants that postpone and then
abbreviate dormancy are typically sporting smaller leaves when they emerge
again. This does not seem to be a positive strategy for the plants.


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