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Re: Invasive Perennials

<aegopodium (bishops weed) extremely invasive and nearly impossible to get
rid of
symphytum (comfrey)   >                          


A useful book to aid in special perennial placement is "Low Maintenance
Perennials" by Robert  S. Hebb    Demeter Press Book --- Quadrangle/The New
York Times Book Co. 1975.

I'm not sure if this in still in print but it  directly addresses "faults"
of perennials, one of which could be 'become(s) invasive'.  

The issue of invasive perennials needs qualification.  Soil type, moisture
available, temperatures, etc. all influence a plant's growth.  Plants that
grow rapidly in some climate areas do not do so in others.  Also, rapid
increase should not necessarily be taken as damning a plant...it should
just be an indication of where to grow it.  
There are some plants (non-native) that do so well that they threaten the
existence of native plants.  Perhaps these are the plants to identify.

Sincerely
Louis Mensing
Z.7b Oregon  
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