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Re: [Aroid-l] Arum - minimum temperatures

I must add that my dracunculus form growing points in winter, but these  elongate slowly in response to temperature, and only fully leaf out after all frost danger has past. My Arisarum patch leafs out and blooms in spring but dies down with the heat of early summer. It does not appear again till next spring and is vigorous and increases in size.
Sauromatum venosum as a crop I believe can help solve the world's hunger problem.

Bonaventure
Peter
 
I live in the Netherlands (zone 8) and have the following experience with these Aroids.
 
The leaf of Sauromatum venosum (Typhonium venosum) won't survive any frost with even one degree of frost they will die down. But this one is summer growing and there is no problem with winter. You can leave the tubers in the ground and they and so long they are deep enough they will survive in the garden.
 
The other Aroids are winter growing and the leaves of some of the species can have more frost than others.
 
Last year my Dracunculus vulgaris were outside with -6 °C, the leaves did collapse and looked like boiled spinach and died. But the central growing point in the pseudostem did survive, it did not freeze enough to kill it, after the frost the plants develop new leaves. But I don't think that Dracunculus plants will survive a frost of -10°C, than even the central growing point will freeze. 
 
The leaves of Arisarum vulgare can only handle about -3°C, when it freezes more they will die down.
 
When the leaves of Arum italicum, A. pictum and A. dioscoridis freezes they will collapse and they look like boiled spinach but when the frost is over they will completely recover. My plants have survived a frost of -10°C and I think that they can handle more than that.
 
The Arum hygrophyllum plant will also collapse with frost, they plant will survive a frost of -5°C and meaby more. But when the frost is over the plant will stay down, the leaves will turn to the light but it is not a nice plant any more.
 
Most of the tubers will not survive any frost, even -1°C will kill them, but when you plant them deep enough they will not freeze.
 
I hope that this will help.
 
With best wishes,
Arno Clement
 
 
----- Original Message -----
Sent: Sunday, October 09, 2005 8:15 PM
Subject: [Aroid-l] Arum - minimum temperatures

Hi, can you please give me some recommendations?
Who can tell me the minimum (night) Temperature of the follwoing Aroids?
All are still green or are about to developing new leaves, that meens that the temperature shouldn't harm them.

I was just able to find some dormancy temperatures from aroid.org:
But this can't be the minimum of the plant if they are still or getting green?!

Sauromatum venosum (Zone 5b) -26°C
Drancuncuus vulgaris (Zone 5b) -26°C
Arisarum vulgare (Zone 7b) -17°C
Arum italicum/Arum pictum (unclear what i realy have Smile) (Zone 7b) -12°C
Arum hygrophyllum
Arum dioscoridis var. cyprium (Zone 8 ) -6°C

thanks
Peter
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