Gladiolus tristis

Kathleen Sayce
Sun, 17 May 2009 13:05:29 PDT
On May 17, 2009, at 10:21 AM, wrote:

> A word of caution on Gladiolus tristus. We have lots of experience  
> with
> it at the Garden. It is a great flower and one I am very fond of,  
> but it
> has to be watched carefully because it does too well. There are  
> areas in
> the Bay Area region where it has a tendency to be invasive; it has
> certainly moved around in our collection.

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).

So in the Garden, Paul, is Gladiolus tristis a determined and  
dominant thug of the invasive variety, or a very successful naturalizer?

In the coastal Pacific NW, where residents have been stunned to  
experience two days in a row with temperatures above 70F.

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