Trichocereus cacti are a genus of succulent plants belonging to the cactus family (Cactaceae). These cacti are native to South America, particularly to regions such as Argentina, Bolivia, Chile, Ecuador and Peru. They are known for their columnar shape and spectacular flowering.

Trichocereus cacti are prized by collectors and cactus enthusiasts alike for their ornamental appearance and ease of cultivation. Some popular species within the Trichocereus genus include Trichocereus pachanoi (also known as San Pedro), Trichocereus bridgesii (Achuma or Wachuma), Trichocereus peruvianus (Peruvian Torch) and Trichocereus terscheckii (Cardón).

These cacti are known for their cylindrical shape, which can reach impressive heights. Some adult specimens can reach several metres in height. They have well-marked ribs and are covered with spines, although the number and size of the spines vary according to the species.

One of the most outstanding characteristics of Trichocereus cacti is their flowering. During spring and summer, they produce large funnel-shaped flowers that can be of various colours, such as white, yellow, orange or pink. These flowers are very showy and often open at night and close during the day.

As for care, Trichocereus cacti are relatively easy to maintain. They prefer well-drained soil and require sun exposure for optimal growth. They are hardy cacti that can withstand high temperatures and some degree of drought, although moderate watering is recommended during the growing season.

It is important to note that some Trichocereus species contain hallucinogenic compounds, such as mescaline, in different concentrations. These cacti have been traditionally used in certain indigenous South American cultures for ritual and medicinal purposes. However, caution and respect for local laws regarding the use of these plants is necessary.

In summary, Trichocereus cacti are a fascinating genus of columnar cacti native to South America. They are valued for their shape, spectacular flowering and ease of cultivation. If you are interested in having an ornamental and hardy cactus, Trichocereus are an excellent choice to consider.