Plants in the Greenhouse - Kalanchoe delagoensis
Unfortunately, the abilities that are advantageous for K. delagoensis are often problematic for other species. Kalanchoe delagoensis has been introduced from its native Madagascar into much of the world and has become a serious problem in Australia, southern Africa, the Pacific islands, Central America, and the southern United States. Kalanchoe delagoensis can move into areas of low fertility and quickly outcompete native plant species, putting many at risk of extinction. In addition to the effect on other plant species, K. delagoensis contains toxins, known as bufadienolides, that cause heart failure in animals. Kalanchoe delagoensis uses these toxins as a passive defense mechanism to prevent herbivory, but when introduced into new areas the animals of that area are unaware of the potential danger and many animal species are also threatened by this prolific invader.
 Armstrong, T. (1983). Weeds of Australia. Crassulaceae—the mother of millions. Australian Weeds 2:146-151.
 Price-Rees, S.J., Brown, G.P. & Shine, R. (2012). Interacting impacts of invasive plants and invasive toads on native lizards. American Naturalist 179:413-422.