[MAIPC] Invasive plants and climate change

Fri Feb 1 12:38:26 PST 2019

Ditto that on Cenchrus purpurascens spread in lower gorge and elsewhere.  The expansion is possibly exponentially increasing each year below Fletchers along the tow-path and paved path and in the bottom land forest (I ride the C&O canal to work daily, except in snow and ice;-), and the weed is expanding up the gorge.  A few years ago (2015) we found a single plant on top of Plummers Island: in the next three years a dense patch developed despite our efforts to remove it by hand.

Rob
Robert Soreng PhD, Research Associate
Dept. of Botany - US National Herbarium (US)
MRC-166 NHB
National Museum of Natural History
Smithsonian Institution
Washington DC 20013-7012
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http://tropicos.org/Project/CNWG

From: Rod Simmons <Rod.Simmons at alexandriava.gov>
Sent: Friday, February 01, 2019 3:19 PM
To: Judy Fulton <jfulton5 at gmail.com>
Cc: Liz Nalle <liznalle5 at gmail.com>; maipc at lists.maipc.org; Soreng, Robert <SORENGR at si.edu>; damien.ossi at dc.gov
Subject: Re: [MAIPC] Invasive plants and climate change

Thanks Judy and all.  Cenchrus purpurascens is a big problem in certain areas of Maryland and D.C. now, particularly the C&O Canal National Historical Park lands near Fletcher’s Boathouse upriver into Montgomery County.

Thanks,

Rod

On Feb 1, 2019, at 2:08 PM, Judy Fulton <jfulton5 at gmail.com<mailto:jfulton5 at gmail.com>> wrote:

Yes, I am really seeing Miscanthus sinensis spreading throughout Baltimore County and other areas in Maryland. I think that it is further along the invasive curve than black fountain grass (Cenchrus purpurascens aka Pennisetum alopecuroides), but I am now seeing C. purpurascens starting to spread in the wild. I believe that we need to pay attention right away to this new invader, its cultivars and closely related species, including purple fountain grass (Cenchrus setaceus aka Pennisetum setaceum).

Judy
____________________________________________

Judith P. Fulton
EcoPlant Consulting: Native and Invasive Plants
Master Gardener, University of Maryland Extension
Chair, Maryland Invasive Species Council Subcommittee on Invasives Lists
Board, Mid-Atlantic Invasive Plant Council
410-337-3701
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On 2/1/2019 1:43 PM, Liz Nalle wrote:
Miscanthus and Pennisetum are both problems in coastal Delaware but I would add that they spread primarily from being planted, then the seeds are wind blown. Regarding Phrag, some areas here have given up on eradication, and are now concentrating on managing it, if that’s even possible. We are very prone to flooding, though, so with sea level rise which we are living, it will be interesting to see it move as it doesn’t tolerate standing water.

Excellent point about Baccharis spreading due to road salt! I see it in many more places recently.

Liz

On Fri, Feb 1, 2019 at 1:14 PM Judy Fulton <jfulton5 at gmail.com<mailto:jfulton5 at gmail.com>> wrote:

When people mention groundsel tree, I'm assuming that they are referring to Baccharis halimifolia. This species is a native to the Coastal Plain ecoregions throughout the mid-Atlantic, but it is becoming adventive in the Piedmont and various mountain ecoregions. I agree with Margaret Chatham that a likely reason for this movement is salt tolerance -- I see the plant fairly frequently in the difficult strip next to highways that have been treated with salt. So, I'm not sure that Baccharis halimifolia is going to become a problem.

Judy
____________________________________________

Judith P. Fulton
EcoPlant Consulting: Native and Invasive Plants
Master Gardener, University of Maryland Extension
Chair, Maryland Invasive Species Council Subcommittee on Invasives Lists
Board, Mid-Atlantic Invasive Plant Council
410-337-3701
jfulton5 at gmail.com<mailto:jfulton5 at gmail.com>
On 2/1/2019 12:07 PM, MARGARET L CHATHAM wrote:
I’d suggest another factor at work in the spread of groundsel tree (and Typha angustifolia): road salt. As the roadways become saltier, they offer better habitat for salt-tolerant plants. (And Ii see Miscanthus spread as primarily driven by planted seed sources — strictly anecdotal comment.)

Margaret

On Feb 1, 2019, at 11:42 AM, Stephen Hiltner <stevehiltner at gmail.com<mailto:stevehiltner at gmail.com>> wrote:

I'll chime in with a few observations. The first invasive example of Miscanthus I saw many years back was in a field outside of Newport, Rhode Island during my one and only visit there. In NC at turn of the century it was only invasive on Mount Mitchell and some horticulturist of great stature, perhaps the one who wrote "the book" on shrubs/trees, said in a discussion at NC Bot Gardens that only one variety of Miscanthus was invasive. In recent years I've seen examples of invasion in NJ and PA along freeways.

Groundsel tree is one to look out for, as it spread from the NC coast up freeways into the piedmont and has become a serious invasive in the Durham, NC area, invading grasslands and lining freeway right of ways. Seen a few incidents in central NJ but not much yet.

Go to Princeton battlefield, and it's hard to imagine porcelainberry getting any worse--topiary on a massive scale.

Steve
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On Fri, Feb 1, 2019 at 10:55 AM Liz Nalle <liznalle5 at gmail.com<mailto:liznalle5 at gmail.com>> wrote:
Here in southern, coastal Delaware, Phragmites australis and Hydrilla verticillata are big problems. I’m not sure how much climate change has facilitated their spread, but they are from father south in Asia I believe.

Liz Nalle
Inland Bays Garden Center
Frankford DE

On Jan 31, 2019, at 9:36 PM, Jil Swearingen <jilswearingen at gmail.com<mailto:jilswearingen at gmail.com>> wrote:

All,

EDDMapS might be enlisted here to help. If one can do a query over time (e.g., 20-30 years) of invasive plant species occurring in the Southeast states that eventually start being reported in the mid-Atlantic in recent years, that would produce a list to start working with. Chuck Bargeron would be the obvious go-to person to run this query. I don't know how to do it with the tools available for users.

Thanks,

Jil

.......................
Jil Swearingen
Invasive Species Consultant
In the Weeds
410-200-7085

On Thu, Jan 31, 2019 at 9:22 PM James Remuzzi <james at sustainablesolutionsllc.net<mailto:james at sustainablesolutionsllc.net>> wrote:
I would second the USDA work on CO2 re vines would add Mile a Minute to those species previously mentioned —vines: both invasive and native, have exploded in last 20 years and are having a devastating impact on Native Forests and Shrublands.

JRR

James R. Remuzzi
Sustainable Solutions, LLC
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On Jan 31, 2019, at 4:27 PM, frazmo <frazmo at gmail.com<mailto:frazmo at gmail.com>> wrote:
Lewis Ziska with USDA has done interesting work about the worrying effects of rising CO2 levels on invasive vines (plus native Poison ivy). My sense is that Kudzu is gradually becoming worse in the northern mid-Atlantic as things warm. Colder temps used to hold back Hedera helix in our north but that obviously is changing. I'm sure there is a long list of southern invasives marching toward us now... Cheers,   Steve Young, Arlington VA

On Thu, Jan 31, 2019 at 10:10 AM Ossi, Damien (DOEE) <damien.ossi at dc.gov<mailto:damien.ossi at dc.gov>> wrote:
Question:  What, if any, invasive plant species appear to be spreading into the mid-Atlantic due to climate change?  I know there’s been talk of southern magnolia and other species that are native to just south of here starting to naturalize in our area, but I’m more interested exotic invasives.

What invasive plants are common in southern Virginia or northern North Carolina that we just don’t have in our area, but could move here with warmer climates?

Thanks,
Damien

Damien P. Ossi
Wildlife Biologist
Fisheries and Wildlife Division
Department of Energy & Environment
Government of the District of Columbia
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Washington, DC 20002
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