Notocactus uebelmannianus Origin and Habitat: It is native to Brazil in the area of Rio Grande Do Sul
Habitat: It grows in flattened rocky terrains amongst agricultural land. It is seriously endangered in its native habitat as much of the land is cultivated for arable crops or grazing pasture
Notocactus uebelmannianus Description: Parodia werneri is a a nice cactus usually solitary, sometimes branching basally to form small clumps. It has glossy green body with appressed spines and bears a ring of the most amazing magenta to royal purple flowers every spring.
Replaced synonym: Notocactus uebelmannianus Buining, Kakt. and. Sukk. 19(9): 175-176 (1968), non Parodia uebelrnannlana Ritter, Kakt. Siidamer. 2: 425-426 (1980). On transfer to Parodia since a Parodia uebelmanniana already existed the name of uebelmannianus was changed to Parodia werneri, hence the name Parodia werneri is the current accepted Scientific name but many growers and plant sellers still use the old name Notocactus uebelmannianus, so you may come across it under both names.
Stem: Shiny dark green, globular or short/squatty up to 12 cm tall and 17 cm in diameter.
Ribs: 12-16, flat, round, more ore less chinlike.
Areoles: Round, large, dull white or creamy white-felted, each with a shallow groove below.
Central spines: Usually absent.
Radial spines: About 6 spider-like, 10 to 30 mm long, appressed against the stem body, one pointing downward, unequal, white to greyish.
Flower: Small about 5 cm in diameter, short funnel-form, shiny, wine red to deep magenta of various tones, or pure yellow (Parodia werneri f. flaviflora). Both purple and yellow flower colours can exist side by side in some populations and the yellow being the most abundant. Therefore the more commercial but less representative purple flowered form was made the species and the more typical yellow flowered the variety.
Blooming season: Spring to early summer, once it reaches about 7 cm in diameter if kept well it will flower every year.
Cultivation and Propagation: Parodia werneri (syn: Notocactus uebelmannianus) is easy to grow and quite resistant to neglect. Nevertheless, it is appropriate to provide adequate growing conditions in order to obtain abundant blooms.
Growth rate: It is a relatively rapidly growing species that will make large clumps given the best conditions.
Soils: It needs a standard cactus mix soil with an excellent drainage. Prefer a low pH compost, avoid substrata too rich in limestone.
Repotting: This plant needs plenty of space for its roots, repotting should be done every other year or when the it has outgrown its pot. It is rot prone and should be planted in a shallow pot. Use pot with good drainage.
Watering: Needs regular water in spring to autumn in summer (it is more demanding than other cactus), but do not overwater, keep dry in winter or give them a very small amount about once a month in winter to prevent shrinkage and root loss.
Fertilization: Feed with a high potassium fertilizer in summer. Regular water in spring to autumn. I tend to
Hardiness: It is moderately frost resistant if kept dry and hardy to -4° C for short periods (depending on varieties and growing conditions). However warmth throughout the year will increase the grower’s success (at temperatures from 5 to 15 degrees centigrade during rest season).
Exposition: The plant tolerates bright situations which encourages flowering and heavy spine production, but is likely to suffer from sun scorch or stunted growth if over exposed to direct sunlight during the hottest part of the day in summer. It grows well with filtered sunlight or afternoon shade.
Uses: It is an excellent plant for container growing. It look fine in a cold greenhouse and frame or outdoor in a rockery. It is also used as a rootstock for grafting delicate and slow growing cactus species.