Complete Guide to Cultivating Trichocereus

Cultivating Trichocereus is relatively simple if basic conditions are respected. These columnar cacti native to South America have perfectly adapted to the European Mediterranean climate, making it easy to grow them both indoors and outdoors.

Substrate

The substrate is perhaps the most critical factor for successful cultivation. Trichocereus need a very well-draining substrate to prevent root waterlogging. A recommended mix is: 40% potting soil, 30% perlite, and 30% coarse river sand. For species that require a more mineral substrate (such as T. terscheckii), increase the proportion of sand and gravel.

Watering

Watering should be adjusted according to the season. In spring and summer, during the active growth period, water every 7-10 days, allowing the substrate to dry completely between waterings. In autumn, gradually reduce watering. In winter, suspend watering almost entirely, especially if temperatures drop below 10°C.

Light

Trichocereus need abundant direct sunlight, ideally a minimum of 6 hours daily. Lack of light causes etiolation (stretching and weakening of the stem). If grown indoors, place them next to the brightest window, preferably south-facing.

Temperature

Most Trichocereus tolerate a wide range of temperatures (5-40°C). Many species withstand light frosts (-2 to -4°C) if the substrate is completely dry. T. terscheckii is the most cold-resistant, tolerating up to -8°C.

Pest Prevention

The most common pests are mealybugs and mites. Regularly inspect the plants and act at the first signs. Neem oil is an effective and environmentally friendly preventive treatment.