Re: propagation of ...

> Lythrum.  The Lythrums, which include purple loosestrife, are invasive.
> There are sterile hybrids of these for sale.  The Lysimachias are not
> invasive.  (according to my unknown source!) I think gooseneck loosestrife
> is a lysimachia.
> Does anyone know more about this?  I hope I'm passing on factual
> information.  Linda, Idaho, Zone 5

It's roughly correct.  The biggest culprit is Lythrum salicaria, which
invades native wetlands, etc.  Of course, some Lysimachias are also
invasive, just not to the point of threatening native habitats.

Here's a good URL that I posted once before about purple loosestrife:

   http://www.ducks.ca/prov/purple.htm

Note what they say about the hybrids that are for sale!

   CULTIVAR CONFUSION  
  
        Loosestrife cultivars have been developed for use as garden 
        ornamentals and landscaping plants.  Cultivars such as 'Morden 
        Pink', 'Morden Rose', 'Morden Gleam' and 'Dropmore Purple' 
        were thought to be safe for garden use, in that they would 
        not produce viable seeds. Recent research has indicated that 
        cultivars can cross amongst themselves or with wild loosestrife 
        and produce viable seed, further contributing to the spread of 
        loosestrife. Plants do not have to be near each other to cross 
        pollinators. Loosestrife planted in gardens may eventually 
        spread to drainage ditches, streams, creeks, wetlands, and 
        rivers. Many wild populations can be traced back to garden or 
        horticultural escapes. 
  
Chris

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