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.
Rubus hayata-koidzumii
This plant can be susceptible to overwatering, however, which can cause root rot in wet or heavy soil and good drainage is important.