Invasive species

Dell Sherk
Sun, 02 Aug 2009 11:22:55 PDT
Here in Eastern Pennsylvania, some named invasives are so prevalent that
most people don't know they don't belong here, multiflora rose, e. g. But
from Jim's list, I have noted  a variety of privet growing in the wooded
margins of our stream, but it is not the type used for hedges. Water
hyacinth is sold here but is not hardy. Lythrum infests the small islands in
the Delaware River and is prevalent along its banks, but it is colorful in
the late summer. 

Not on that list:  Also, we have a great deal of autumn olive. And there are
huge numbers of shrubby honeysuckles all over the place. Among geophytes
that are becoming a problem are Ornithogalum umbellatum, if it is happy (and
it is very hardy), and Iris pseudacorus which is making itself very much at
home along waterways. It is sold in every garden center as a good pond

Here at my school, we have a well intentioned, self-styled, "tree hugger"
who has organized the students to eliminate the invasive species so that the
native species will return. They have cut down great swathes of multiflora
rose along the stream, but they left the thorny branches which subsequently
clogged the stream and caused flooding. Multiflora rose is very hard to
eradicate, so "Eco-Man" proposes using Roundup to kill the roots. I am


-----Original Message-----
From: []
On Behalf Of Jane McGary
Sent: Sunday, August 02, 2009 12:51 PM
To: Pacific Bulb Society
Subject: Re: [pbs] Invasive species

Jim Waddick posted a list of  "100 of the World's Worst Invasive 
Alien Species"
>according to the IUCN's Invasive Species Specialist Group reported at:

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