Echinopsis candicans (Gillies ex Salm-Dyck) D.R.Hunt
Cereus candicans, Echinocactus candicans, Trichocereus candicans,
This species is native to northern and western Argentina (Monte Desert).
Echinopsis candicans, formerly known as Trichocereus candicans, is a slow-growing shrubby cactus with light green, upright to sprawling stems with 9 to 11 low ribs lined with clusters of brownish-yellow spines. The stems are cylindrical, up to 24 inches (60 cm) tall, up to 7.2 inches (18 cm) in diameter, and mostly branching at the base. The large white areoles are 1.2 inches (3 cm) apart and bear 10 to 12 radial spines and a few central spines. The radial spines are up to 1.6 inches (4 cm) long. Central spines are up to 4 inches (10 cm) long.
The large fragrant flowers are white with a yellow center and pinkish outside. They are funnel-shaped, up to 10 inches (25 cm) long, up to 7.6 inches (19 cm) in diameter, usually appear in late spring, and open at night. Fruits are globose to ovoid and split down one side.
USDA hardiness zone 9a to 11b: from 20 °F (−6.7 °C) to 50 °F (+10 °C).
How to Grow and Care
If you can grow cacti and succulents successfully, you can likely grow the Echinopsis species without much trouble. Like many cacti, they prefer a drying period between waterings, even when slightly wilt. When you water, however, you should water deeply. The plant will noticeably plump up. The cactus mustn't be exposed to prolonged dampness and sitting water. Never let your cactus sit in a dish of water. Lastly, ensure fertilizer during the growing season for the best results.
Echinopsis can easily be rooted from offsets, which cluster around the mother plant's base. Cut offsets close to the stem, at the narrowest possible place. When rooting cacti from cuttings, let the fresh cutting dry on a paper towel and cut the cacti at the narrowest place possible. After a few days to a few weeks, depending on the cut surface's size, the cut surface should have dried out and formed a callous or slightly rough opening. Once the callous has formed, place the cutting in a rooting mixture of fast-draining cacti soil.
See more at How to Grow and Care for Echinopsis.
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