If you live in an area with frigid winters, such as the Arctic Circle or the Antarctic Circle, you should consider a different plant for your garden, as these plants need a warm environment to thrive. If you live in a more temperate climate, then mammillaria elongata will be an excellent plant as they can handle the cooler temperatures. It is highly recommended that your plant in a container can be moved indoors if your climate drops below 20° F (-6.7° C) is recommended. As long as it gets some sunlight, it's OK.