Fruit and foliage of the Strawberry Guava (Psidium cattleianum), Wailua Falls, east Kaua'i. A fruit tree that is considered to be one of the worst invasive weed species in the Hawaiian Islands. Typically forms extremely dense stands of trees that are completely impenetrable. In addition, it is strongly allopathic, exuding toxic chemicals that inhibit the growth of understory plants. Its tasty fruit is eaten by feral pigs who then spread the seeds in their feces.

Fruit and foliage of the Strawberry Guava (Psidium cattleianum), Wailua Falls, east Kaua'i. A fruit tree that is considered to be one of the worst invasive weed species in the Hawaiian Islands. Typically forms extremely dense stands of trees that are completely impenetrable. In addition, it is strongly allopathic, exuding toxic chemicals that inhibit the growth of understory plants. Its tasty fruit is eaten by feral pigs who then spread the seeds in their feces.