this genus is composed of a single species of columnar catus originating from South America, found mainly in Argentina and Bolivia. It has an erect, very branched stem, which has 8-10 very evident ribs, along which numerous areoles are equipped with long, yellow-black thorns, which become greyish with age, stiff; it is medium green, sometimes tending to bluish; in nature it can reach 7-9 meters in height, with stem diameter close to 40-50 cm. In summer it produces numerous tubular flowers, 10-15 cm long, white inside, green on the outside, covered with scales, which bloom at night and remain open for many hours; in autumn you can notice the large oval green fruits that become red when ripe; they are edible and eaten cooked, or they can be eaten raw. The specimens cultivated in a container remain within dimensions of less than two meters, developing numerous branches.
Exposure: the stetsonie must be grown in full sun, can withstand temperatures close to -8 ° C, but the ideal winter temperature is close to 10 ° C, for this they must be sheltered in a cold or temperate greenhouse, or at home, in a bright place and well ventilated.
Watering: from March to October water regularly, letting the soil dry well between one watering and another, intensify watering in the hottest and dryest periods of the year. In winter drastically reduce watering: if the plant is kept at temperatures below 10-15 ° C, stop watering; if your stetsonia is kept indoors, at temperatures above 15 ° C it is good to water it at least once a month. In the vegetative period, add potassium-rich fertilizer to the water used for watering, every 10-15 days.
Stetsonia coryne: Soil and reproduction
Soil: prefers loose soils, very well drained; It is possible to use a specific soil for cactaceae, prepared by mixing universal soil with washed river sand and perlite or quite fine lapillus. These plants should be repotted at least every two years, to allow a balanced development.
Multiplication: generally occurs by cuttings, even if it is possible to sow the stetsonie in spring, placing the small seeds, completely cleaned from the pulp that contains them, in a seedbed filled with peat and sand in equal parts, which must be kept moist and in place warm and sheltered from the sun until the seedlings are large enough to be handled, to repot them in a single container.