Cleistocactus strausii
The cactus prefers free draining soils, strong sunlight, but not high temperatures — in fact it can withstand hard frosts down to -10 °C. In its natural habitat it receives plenty of water during the summer, but almost none over the winter. In cultivation, watering too much in winter often leads to root rot.
Pereskiopsis
The shape of "Pereskiopsis" is not that of a typical cactus, it has large green leaves and grows like a bush. Only the presence of areoles, usually with spines and glochids, and the flowers, allow it to be identified as a cactus. Flowers open during the day. "Pereskiopsis" is often used as a grafting stock for other cacti, as it promotes quick growth of the scion. Its small diameter makes it an excellent grafting stock for small seedlings, but many species will outgrow the stock and need to be re-grafted or rooted. "Pereskiopsis" are tropical cactus and can not withstand any frost. Maintain a temperature of approximately 12 °C during winter and be careful with water. The stem tends to rot very easily, especially with low temperatures when the plant is not actively growing.