> I'm curious to know what you call > invasive. Typically in ecology, an > invasive plant dominates its growing > area and crowds out most/all other > species. If left alone, it will > successfully replace the original plant > community with itself; examples in my > neighborhood: gorse, scots broom, ivy, > and a couple of beach grasses (Ammophila > species), and quack grass. > > I see many people use the word invasive > to mean a plant that successfully sets > seed and spreads around when in fact > this is an example of naturalization, > one step beyond establishment (thriving > in the original spot of introduction). I wonder what kind of ecology lessons are being taught sometimes. Non-native plants or animals which naturalize and spread do not need to kill all other plants or animals in the area they grow in to be invasive. I agree things like Gorse or Ivy are especially bad. However, successful invaders can do much harm and destroy the natural habitat for the critters who's niche they are well suited to. The web of life is complex and easily disturbed. Seemingly minor disturbances during the short time a human lives, can turn into serious problems over long time periods. Kelly O'Neill http://www.bigbubblers.com/ and and Wet Rock Gardens Flower Farm 2877 N 19th Street - Springfield, Oregon 97477 U-Pick and more at the farm (open 9 to 6, Sun, Wed and Fri - from March thru Halloween) kellyo@wetrock.com - http://www.wetrock.com/