FERNS: Ferns as undesirable plants

Hello everybody

I thought I'd mention that ferns are not always regarded as desirable plants 
everywhere.

In New Zealand, as probably elsewhere, there is an Act of Parliament ( ie, a 
Law)  and Unwanted Organisms or Notifiable Organisms under the 
Biosecurity Act (1993) are listed

These urls give some details

http://www.maf.govt.nz/biosecurity/pests-diseases/registers-lists/unwanted-
organisms/index.htm
http://www.protectnz.org.nz/downloads/nppa_pest_plant_list.pdf
http://www.maf.govt.nz/mafnet/publications/pestplants.pdf

It is worth noting that Osmunda regalis is listed as an outlawed plant, and 
Cyathea cooperi is on the list for consideration.

Osmunda probably because it is fairly aggressive in moister northern places 
and can take over and crowd out indigenous vegetation that is regarded as 
being more desirable. Cyathea cooperi probably because it grows very fast 
and has the potential to become well established in the indigenous northern 
forests, in particular, and potentially displace indigenous tree ferns.

Brian Swale

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