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.
Parodia leninghausii
As most of the cactus, they need well drained soil, sunny exposure, regularly watering in summer and not at all in winter. In temperate climate, keep them outside in summer. In the wild and in winter, plant accepts frost at -4 °C if totally dry. In cultivation, it is preferable to keep cold temperature, but more than +2 °C.