Cactus Habitat: Pocono Mountains
Pennsylvania has only one native cactus species, Opuntia humifusa, and it is considered a species "of special concern" by the Pennsylvania Biological Survey. Only about 30 occurrences throughout the state are known to the Survey.
This species grows in dry, exposed, rocky habitat like cliffs and shale barrens. As long as the ground around their roots drains well, these cacti can easily survive sub-freezing temperatures.
Threats to cacti in the northeastern states include poaching, quarrying, nonnative insect pests, habitat destruction, and extremely wet winters.