Or you could get really serious with your brushweeds and use Grazon [poster]
A series of posters advertising the use of Grazon, a herbicide for control of woody and herbacious weeds. DowElanco (NZ) Ltd. ca.1990's
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Poster. Depicts a helicopter flying upside down using its rotating blades to prune a gorsebush.
Poster. Depicts a digitally modified cow with a blade attached to its tail pruning a gorsebush.