Gladiolus tristis

Kelly O'Neill
Sun, 17 May 2009 21:39:28 PDT
> 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 
 Kelly O'Neill 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) -

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