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 email: btankers@chicagobotanic.org 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? p://http://pacificbulbsociety.org/pbswiki/