Cleistocactus jujuyensis, commonly called the red spined silver torch, is a columnar shrubby cactus plant in the family Cactaceae. Cleistocactus jujuyensis is found in Argentina where it is found in the Jujuy province. C. jujuyensis typically grows to a height of 3 feet and a diameter of 2 inches. The stems are densely covered in pale white to dark red spines depending on light exposure and maturity. Flowers bloom in mid spring to early summer with a bright red color and tube shape. This cactus is grown as an ornamental plant for its shrubby growth habit and bright red flowers. C. jujuyensis grows best in full sun to partial shade while sitting in well-draining soils. Water the plant adequately during summer and keep dry during winter. It is not particularly drought-tolerant and will benefit from regular watering during dry spells, however allow the soil to dry in between waterings. USDA plant hardiness zones 9a to 11b.
Cleistocactus jujuyensis seeds require consistent moisture and humidity to germinate, but the soil should not be soaking wet. Cloning boxes, ziplock bags, and other containers that retain humidity are ideal to store sown pots. Use a well-draining sterilized soil mix. Seeds should be sown directly on top of the potting mixture and lightly covered with a thin layer of sand or potting mix, just enough to cover the seeds. Germinating pots should be kept indoors, out of extreme light and heat. Ideal germination temperatures range from 70°F to 80°F. Germination typically takes 1 to 3 weeks to occur. Even with optimal conditions, germination may be slow and sporadic.
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