Trichocereus macrogonus, also known as Echinopsis macrogonus, is a columnar cactus species native to the high valleys and mountainous regions of Ecuador, Peru, and Bolivia. This slow-growing cactus can reach up to 16 feet tall, with erect, ribbed stems that are adorned with areoles bearing needle-like spines. The flowers, which bloom nocturnally, are large and funnel-shaped, with colors ranging from pale yellow to yellowish-green, and on rare occasions, pink. Flowering typically occurs during the spring and summer months, and the flowers are considered quite showy due to their size and contrast against the green stems.

Trichocereus macrogonus is noted for its psychoactive alkaloid mescaline, which has been used ritually and medicinally since pre-Columbian times. In cultivation, it is valued for its striking architectural form and its ability to adapt to a variety of arid landscape settings. It is often used as an ornamental plant in cactus and succulent gardens, rock gardens, and as a potted specimen. This cactus prefers full sun exposure and requires well-draining soil to prevent root rot. It is drought-tolerant and requires minimal watering, making it a low-maintenance choice for gardeners. While it is generally disease-resistant, overwatering can lead to fungal infections.CC BY-SA 4.0