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  tall Alocasia 'Calidora' with a "pseudotrunk"
From: leu242 at yahoo.com (Eric Schmidt) on 2008.06.23 at 20:30:29(17924)
I knew the tubers on some Alocasia would grow above
ground and form a "pseudotrunk" but didn't know they
could get this big. This is Alocasia 'Calidora' and it
is about 7ft tall with about 5ft of "trunk"



From: ju-bo at msn.com (ju-bo at msn.com) on 2008.06.24 at 22:09:02(17946)
> Date: Mon, 23 Jun 2008 13:30:29 -0700
> From: leu242 at yahoo.com
> To: aroid-l at gizmoworks.com
> Subject: [Aroid-l] tall Alocasia 'Calidora' with a "pseudotrunk"

Dear Eric,

Yes, some Alocasias do grow tall. I THINK that on this list, and only just recently, Pete Boyce was describing how, in the wild, the falling leaves keep up with the vertical growth of an Alocasia rhizome/''trunk'', and that many Alocasias eventually die when potted because the grow too tall and there is no humus being deposited around the rhizomes for them to send new roots into. I THINK he also said that many species sort of ''fall over'' naturally and grow horizontally along the ground. He said to try growing them in a pot about 1/2 full of medium, and adding old leaves around their rhizomes as they became taller.
We find the same thing/problem with Neotropical Xanthosoma sps., the equiv. to the Asian Alocasias.

Good Growing,


From: leu242 at yahoo.com (Eric Schmidt) on 2008.06.25 at 13:06:00(17955)
Thats interesting! I know sometimes Xanthosoma
sagitiifolium starts to grow upright and usually falls
over. Alocasia 'Calidora' is probably the strongest
one we have grown and the one in the photo is the
tallest any of got. Alocasia 'Portora' grows up but
either falls over or declines, and the top dies off.
Same with Alocasia portei. Now I know why they


From: lbmkjm at yahoo.com (brian lee) on 2008.06.25 at 17:25:35(17961)
Dear Eric and Julius,


I have noticed the same thing in Hawaii...but, I did not know why these things got so large and then declined...I assumed it was part of their natural history...not so much a horticultural issue. Although we also have nematodes and that loomed in my mind.

Add Alocasia'Sarian', to the large pseudotrunk Alocasia that get large and fall over and decline. I will mound leaf litter on my other plants and see how that works.

Thanks Julius for great advice...again.



From: botanist at malesiana.com (Peter Boyce) on 2008.06.25 at 21:19:16(17966)
A couple of small additions. Why is this structure being called a
pseudotrunk (derivided from pseudostem); this is a true stem (or 'trunk').
The 'pseudo' implies that the aerial 'stem' is formed from closely clasping
petiole bases and that the growth point (meristem) is buried away at ground
or below ground level (as in Dracunculus, Helicodicerous, many Arisaema,
etc.) that is not what happens when Alocasia and Xanthosoma begin to produce
erect stems long enough to become leaf-less.

Another snippet is that there is a new Alocasia from SW Thailand which
produces an erect and never decumbent trunk to 2 or more metres, very slim,
almost leafless except for a terminal tuft of 1 m petioles with lamina ca. 2
x 1 m


From: gcyao at mydestiny.net (George Yao) on 2008.06.26 at 09:32:48(17976)


I encountered this tall A. macrorrhizos 2 years ago in habitat.

George Yao

From: lbmkjm at yahoo.com (brian lee) on 2008.06.26 at 10:47:56(17978)
Dear Pete,


You are correct...I took the term and ran with it. It certainly is not an herbaceous banana stem we are talking about. Thank you for pointing this out.

The new Alocasia sounds very strange...was it from an area newly or rarely botanized? It is amazing that such a large plant has not been recognized earlier. Is it an understory plant or is it found in an open habitat? I have a difficult time visualizing this thing...regarding the almost leafless, terminal tuft...the petioles and lamina are large...how many leaves are in the tuft?



From: gcyao at mydestiny.net (George Yao) on 2008.06.28 at 00:10:09(17990)

Julius and Eric,

Some of the A. macrorrhizos I encountered in habitat 2 years ago were
fallen while others were still upright. They were on a slope up a
hill. The area was quite wet, being along a water run-off. I think
the fallen ones lost their foothold, maybe after a flashflood, as
shown in the first attached picture. Some of the fallen ones grew to
be quite big after their fall. The 2nd attached picture shows a clump
of trunks wedged together at the bottom, thus supporting each other
and staying upright.

George Yao

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