noxious weed reasons

Diane Whitehead
Sat, 27 Jan 2007 14:55:50 PST
It would be useful if the reasons for designation as a noxious weed  
are given.  Perhaps in some places, they are.

  In some cases, it is because the plant is poisonous to livestock.   
Being deadly to humans doesn't necessarily count, and it took me a  
while to get Conium maculatum (which has killed one child here)  
removed from a public garden. (The head gardener phoned the powers  
that be, who assured him it was not a noxious weed.)  It continues to  
thrive throughout the region, and every year I give warnings to  
people who have it growing on their land.

Some plants are prohibited because they are an alternate host of a  
disease that destroys an important crop. (Mahonia and Berberis/  
wheat) though minor crops don't receive the same protection (pear/ 

Plants whose only crime is excessive propagation did not get added to  
the banned  lists.

Fairly recently (in the last 20 years or so),  volunteers have been  
allowed to destroy plants like ivy, broom and blackberry in parks.   
Prior to this, no one was allowed to remove them, even though some  
people had sought permission.

Diane Whitehead
Victoria, British Columbia, Canada
maritime zone 8, cool Mediterranean climate
mild rainy winters, mild dry summers

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