Echinopsis is a genus of Cacti in the Cactaceae family. It is native to parts of South America (typically Argentina, Chile, Bolivia, Peru, Brazil, Ecuador, Paraguay and Uruguay). Species vary in form and size – from small globose types to large columnar types. They all produce very large flower blooms, of varying colours, with long floral tubes. Flowers are very short lasting, some are nocturnal. They are fairly easy to grow and are extremely well adapted to drought and able to store water within their structure to ensure survival through dry periods. They are often grown in greenhouses, particularly in regions unsuited to their cultivation outdoors. They can be grown in the ground or in suitable containers which means that they are suitable as houseplants, being tolerant of the often dry atmosphere. Echinopsis calochlora is from Bolivia and Brazil, and is a small globose clump forming cactus. It has golden spines, and fragrant pure white, 4 inch diameter flowers.