From the middle of May to the end of September they like to be outdoors, however direct sun should be avoided. From November to March Epiphyllum/Phyllocactus can be kept cool but it is good to have at least 12°-15°C. They should be well fertilized especially after flowering. They need a bit more water as most of the other cacti and other succulents. If it is very hot, they can be watered twice a week. During winter you don`t have to water so often,especially when they are kept cool.