Echinopsis pachanoi
The San Pedro cactus is very easy to grow in most areas. Because it grows naturally in the Peruvian Andes Mountains at high altitude and with high rainfall, it can withstand temperatures far below that of many other cacti. It requires fertile, free-draining soil. They average half a meter per year of new growth. They are susceptible to fungal diseases if over-watered, but are not nearly as sensitive as many other cacti, especially in warm weather. They can be sunburned and display a yellowing chlorotic reaction to overexposure to sunlight.
Echinopsis eyriesii
Water the plants well in summer, but let them dry before watering again. Use then special fertilizer for cacti.
In winter keep dry. The temperature may be as low as -7 °C. For flowering in summer, the rest (dry and cold) in winter is necessary.