Classroom Resources RMB_30-09-2010_ROP_14_rok-Harrisia-cactus-2_fct500x308x59_t460

Published on June 10th, 2013 | by Simi


Crazy cacti!

Harrisia cactus is a perennial plant from South America. Harrisia cactus was introduced into Queensland as a pot plant in the 1890s. Dense infestations can reduce pastures to a level unsuitable for stock. Harrisia cactus is a declared pest under Queensland legislation.

A newspaper article discussed the harrisia cactus. Landholders are required to control this plant on their properties. Unfortunately, effective control methods are proving difficult to find, and it is considered that more research is sorely needed. The story stated that some researchers had counted 125,000 tubers per hectare in places.

How far apart would the plants be, on average, at this density per hectare?


Question created by Bob Nelder, Toowoomba State High School



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