Echinopsis mamillosa Gürkey
Echinopsis mamillosa subsp. mamillosa, Echinopsis herbasii, Echinopsis roseolilacina
Echinopsis mamillosa is a cactus with a solitary spherical stem with 13 to 17 deep ribs formed into tubercles. The rounded areoles are spaced up to 0.5 inches (1.2 cm) and bear a cluster of yellowish spines with brown tips. The stem has 1 to 4 central and 8 to 12 radial spines per areole. The flowers are white with rose tips. They are large concerning the diameter of the stem, up to 3.1 inches (8 cm) in diameter and up to 7 inches (18 cm) long.
USDA hardiness zone 8b to 11b: from 15 °F (−9.4 °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, ensure to fertilize during the growing season for the best results.
Echinopsis can be easily rooted from offsets that 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 Bolivia.
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