General Impact
Little is known about the potential impacts of Pteris cretica. On the British Isles it is considered a threat more so for its progressive radial expansion in range that has been apparent since 1930 rather than any potential ecological and economic impacts (Robinson, 2009). In the ecologically fragile limestone grottoes of Florida, P. cretica and a range of other invasive exotic species can be problematic to rare native species if facilitated by shady, humid conditions (Florida Natural Areas Inventory, 2010).
Location Specific Impacts:Florida (USA) (United States (USA)) 
Competition: Shaded, humid environmental conditions facilitate the growth of exotic species such as Pteris cretica in the ecologically fragile limestone grottoes of Florida. As space and resources are limited in these habitats, the presence of these exotic species can be problematic for rare native species (Florida Natural Areas Inventory, 2010).
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