Invasive species

Boyce Tankersley
Mon, 03 Aug 2009 07:10:54 PDT
Interesting list and question. 

We constantly battle loosestrife along the waterways. As part of the
flood management for the Skokie River watershed we are committed to
accepting water into our lakes during storm events. In the last year we
have had 3 of flood events so the likelihood of us ever being
loosestrife free is very slim.

The very few accessions we had of Ligustrum and Fallopia have been
removed from the collections.

We grow Lantana camara cultivars and Wedelia in our annual displays
sometimes. At minus 17 degrees, there is no reseeding or resprouts.

We grow a different Tamarisk species as a dieback shrub.

Boyce Tankersley
Director of Living Plant Documentation
Chicago Botanic Garden
1000 Lake Cook Road
Glencoe, IL 60022
tel: 847-835-6841
fax: 847-835-1635

African tulip tree (Spathodea campanulata)
black wattle (Acacia mearnsii)
Brazilian pepper tree (Schinus terebinthifolius)
cogon grass (Imperata cylindrica)
cluster pine (Pinus pinaster)
erect pricklypear (Opuntia stricta)
fire tree (Myrica faya)
giant reed (Arundo donax)
gorse (Ulex europaeus)
hiptage (Hiptage benghalensis)
Japanese knotweed (Fallopia japonica)
Kahili ginger (Hedychium gardnerianum)
Koster's curse (Clidemia hirta)
kudzu (Pueraria montana var. lobata)
lantana (Lantana camara)
leafy spurge (Euphorbia esula)
leucaena (Leucaena leucocephala)
melaleuca (Melaleuca quinquenervia)
mesquite (Prosopis glandulosa)
miconia (Miconia calvescens)
mile-a-minute weed (Mikania micrantha)
mimosa (Mimosa pigra)
privet (Ligustrum robustum)
pumpwood (Cecropia peltata)
purple loosestrife (Lythrum salicaria)
quinine tree (Cinchona pubescens)
shoebutton ardisia (Ardisia elliptica)
Siam weed (Chromolaena odorata)
strawberry guava (Psidium cattleianum)
tamarisk (Tamarix ramosissima)
wedelia (Sphagneticola trilobata)
yellow Himalayan raspberry (Rubus ellipticus)

	How many of these "World's Worst" do you grow in your garden 
and how many are sold in your local garden centers?


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