Phaedranassa is a genus in the family Amaryllidaceae which includes nine species, six of which are found only in Ecuador, the remaining three being from Colombia, Costa Rica and Peru. They are largely montane species, where they grow in disturbed areas, often colonizing road cuts, and usually coming into bloom after the dry summer season in their native lands. These beautiful bulbs are characterized by having leaves that are glossy green, greyish-green, or covered in a dusty bloom. The flowers are produced in an umbel, most species having large tubular pink or red flowers that are variously banded in green, with anywhere from five or six flowers to fourteen or fifteen to an umbel. The one species that is different from the others is P. viridiflora, seen here to the left, with yellow flowers banded green.
While some other amaryllids can be challenging to grow and bring into bloom, Phaedranassas have proved extremely easy and obliging. After reaching maturity, they will bloom every year. I grow them in a mix high in organic material, and they have grown and increased well in anywhere from a one to a five gallon container. They need regular fertilization, since some species are quite vigorous, and they need to reach a certain critical size before they bloom. These bulbs are not frost-hardy and since they grow rather shallowly with the neck just barely exposed, freezing could potentially damage the bulb, and it is advisable to grow them in a greenhouse in anything but the mildest climates. P. glauciflora is seen here above to the right.
It is often said in reference books that phaedranassas can be brought into bloom at any time of year by withholding water for two months, then resuming watering. I have tried this, and it works! It doesn't seem to matter at all whether they are kept cool or warm during this forced dormancy, and they generally bloom about eight weeks after watering has been resumed. Using this technique, therefore, one could bring them into bloom for the winter months. With bright light, Phaedranassas can be successfully grown as houseplants. Here is P. dubia to the left.
Most of this description I originally wrote for the Pacific Bulb Society wiki, which has more photographs and information, and is an excellent resource: https://www.pacificbulbsociety.org/pbswiki/