What cactus has the longest thorns?



  1. 0 Votes

    The cacti species Opuntia phaeacantha and Opuntia polyacantha have the longest spines of US Southeastern species.  The Peruvian Torch cactus has spines which are 6 inches long.  These cacti are native to the regions of the high Andes Mountains.

  2. 0 Votes

    I don’t think there is any one species of cactus with longer thorns than any other. Individual cacti are variant enough within a single species that a range of thorn lengths has been observed on each of them.

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