Echinopsis mirabilis Speg.
Flower of Prayer
Acanthopetalus mirabilis, Arthrocereus mirabilis, Setiechinopsis mirabilis
Echinopsis mirabilis is a small cactus with a cylindrical, dark brown, usually solitary stem with black and grey spines. The stem is up to 6 inches (15 cm) tall and up to 1 inch (2.5 cm) in diameter. Flowers are long-stemmed, white, nocturnal, and strongly scented. They appear in summer and only last a few hours.
USDA hardiness zones 10a to 11b: from 30 °F (−1.1 °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 too much trouble. Like many cacti, they prefer a drying period between waterings, even to the point where they 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, make sure to fertilize during the growing season for the best results.
Echinopsis can be easily rooted from offsets, which tend to cluster around the base of the mother plant. Cut offsets close to the stem, at the narrowest possible place. When rooting cacti from cuttings, let the fresh cutting dry out slightly on a paper towel and cut the cacti at the narrowest place possible. After a few days to a few weeks, depending on the size of the cut surface, 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.
This species is native to eastern Argentina.
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