Trichocereus Terscheckii is the hardiest of the trichocereus species, being able to withstand temperatures as low as 15 degrees Fahrenheit. It is also one of the largest in the genus with mature specimens reaching between thirty and forty feet in height and ten inches in diameter. Its massive stature and mid-stem branching habit gives it a treelike appearance that much resembles America’s Giant Saguaro (C. Gigantea). However, this Argentina native grows much quicker and can tolerate more rainfall and colder temperatures, making it a popular landscaping substitute to the Giant Saguaro. Its spines are thick and golden and its blooms are large, white and nocturnal. They can easily measure eight inches in length. There is also some suggestion that terscheckii may be part of a similar sacred tradition as certain other trichocereus varieties.
Growing Information: Seeds should be germinated in a fine sandy soil at about 70-75 degrees. A commercial potting mix with the larger material strained out is ideal. Flatten out the soil and then put a thin layer of loose soil above it. Sow the seeds on the surface and press in very lightly. They need light to germinate. Mist the soil to keep it moist and cover with clear plastic. Ideally, the covering should not be flat across the top because it will cause the water to drip back on the young seedlings, which sometimes causes rot. Something like a sandwich bag often makes a better “tent” because the water will run down the sides more easily. The soil should not be allowed to dry out while the plants are seedlings. Use a mister if the soil does get dry. Place the seedlings on a heat mat (ideally) and in bright light. Placing the seeds just a few inches from fluorescent lights is ideal for starting seedlings, although natural light will work too. Note that using a heat mat will cause more evaporation, which may require more attention. Be sure to air out the seedlings once a day for best results.