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Re: Invasive aroids?

Hi Steve,

Had to respond to my name mention. P ternata is not a vigorous grower in my Kansas City garden except in spots that stay damp which is not much. It mostly just hangs around and I see it now and then. 

P. pedatisecta is also that way, but I gave some to friends in St. Joseph about an hour North of KC. In their damp woodland conditions it has become a pest and they regularly dig up and discard piles of small shoe sized tubers to keep it under control. While cursing me under their breath. In my own drier garden it is well behaved and I find it attractive when it gets to 30 in tall and blooms.

So much depends on microclimate conditions such as sun/shade, damp/dry, dense clay/porous loam, etc. and here on the ege of the prairie ample water all year long.

Can’t really call any Aroids invasive here without more than normal rainfall. And I am always glad to try more ‘weeds’ that are likely to just survive here.

Jim W. 




On Aug 14, 2018, at 3:14 PM, Steve Marak <samarak@gizmoworks.com> wrote:

I suspect there is some variation depending on the clone. I have two accessions of Pinella ternata, considered one of if not the weediest of the genus. One, from Jim Waddick, I've grown outdoors for many years now. It grows so slowly there were years I wasn't sure it was increasing at all. Definitely not invasive, in my climate.

The other, acquired later from another source, is very vigorous. Seeds and bulbils everywhere, it's a real problem and I don't let it out of the greenhouse or share it. One of my projects for this year will be at least to get it back in bounds, because currently I don't dare recycle medium from that part of the greenhouse into my outdoor beds. I may just go on an eradication campaign.

Arum italicum is borderline here (NW Arkansas). It seeds around our yard, not rampantly but consistently. Fortunately, as Jonathan says, it's easy to recognize even when small, and so far I've only seen it jump into nearby shady areas.

Gonatopus has not survived outdoors here.


On 8/14/2018 2:33 PM, Ertelt, Jonathan B wrote:

Cannot agree loudly enough about the Pinellia, the fruit is barely noticeable but I now have it all over my yard and it is difficult to get back in bounds once escaped. Around here (Nashville, middle Tennessee) Arum italicum could probably become invasive, but the leaves are obvious enough that it can be pulled or dug and shared with a warning. But my experience with the Pinnellia spp. tells me to refuse to share this one most seriously. Never have tried Gonatopus outside – would be surprised to find it seed hardy this far north, but it might be – don’t think I’ll test it out. Good Growing!

 

Jonathan

From: aroid-l-bounces@www.gizmoworks.com on behalf of a sunjian a*@gmail.com
Reply-To: Discussion of aroids aroid-l@www.gizmoworks.com
Date: Tuesday, August 14, 2018 at 1:57 PM
To: Discussion of aroids aroid-l@www.gizmoworks.com
Subject: [Aroid-l] Invasive aroids?

 

I'm wondering whether there are any aroids that are considered invasive? I know some aquatics can be (e.g. Pistia stratiotes), but what about any land-based ones?

 



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Dr. James Waddick
8871 NW Brostrom Rd
Kansas City, MO 64152-2711
USA
Phone     816-746-1949





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