Rebutia krainziana: planter, cultiver, multiplier

Rebutia krainziana is a beautiful little flowering cactus, with short pectinate prickles, so it does not sting. It is quite easy to grow and flowers in early spring. Its Nuda shape, with vestigial leaves, is quite extraordinary.

Rebutia krainziana

Botanical

Scientific N. Rebutia krainziana

Synonyms Rebutia marsoneri var Krainsania

Origin probably horticultural, if not from Argentina such as Rebutia marsoneri

Flowering spring

Flowers red, pink, white rarely yellow

Typecactus

Vegetationlively

Foliage no leaves

Height15cm with age

Plant and cultivate

Hardiness slightly hardy, up to -4C

Exposition semi-shade very bright shade

Soldraining and plutt mineral

Acidity neutral

Humidity normal in summer, dry in winter

usecontainer culture, window edge, veranda, frost-free greenhouse, t-shaped exterior

Plantationspring t

Multiplicationreject cuttings, seedlings

Rebutia krainziana

Rebutia krainziana is a small globular cactus belonging to the family Cactaceae. Rebutia krainziana has never been found in nature, it is believed to be a cultivar or a variety horticultural Rebutia marsoneri, discovered by a German cacti lover. Rebutia marsoneri is a Rebutia thick, with large yellow flowers, native to the province of Jujuty, located in Argentina.

Rebutia krainziana, a cactus that does not sting, beautiful and space-saving, easy to grow even in the house, has obviously spread in culture.

Description of Rebutia krainziana

Rebutia krainziana is a small cactus in ball shape, with a depressed apex, wide enough for the genre. Its body, spherical to cylindrical, can exceed 10 cm in width. As number of Rebutia, the produces with age some rejections, but without being particularly proliferating; moreover, most of the suckers end up separating more or less from the mother plant.

Its areolas, often white, are arranged in a spiral, borne on tubercles (small geometric mounds). They have short to very short spines (a few millimeters), often white, which run almost parallel to the epidermis, but never outwards, so that this cactus has a “grid” of prickles which protects the skin. ‘epidermis, but do not sting : spurs called ” pectinate ».

The flowers appear in spring; Rebutia krainziana is undoubtedly the rebutia with the most flowering precocious. Its funnel-shaped flowers open wide, measuring 3.5 to 4 cm, bordered by large tepals, red, orange, or more rarely yellow or white, rich in yellow stamens. These flowers develop from already old areolas, towards mid-height, and leave visible the magnificent hollow and spiral apices: the whole is particularly aesthetic.

Autogames, the flowers then produce small orange fruits (about 4 mm) releasing small dark seeds as they dry.

Variety of Rebutia krainziana

  • Rebutia krainziana f. naked or f. inermis is a shape that deserves special attention. Indeed, his areolas are almost without prickles : the small green balls are bare, only the geometric tubercles outline the surface with an extraordinarily beautiful apex where 2 dense and perfect spirals intersect. In fact, this shape makes reappear tiny triangular vestigial leaves that cover the areolas, an ancestral character from the days when cacti still had leaves. With direct sunlight, her skin is tinged with purple. Its large flowers are deep red.
    Of course, this cactus with bare skin must be protected from knocks, burns and slugs.

  • Rebutia krainziana f. naked crested is the same shape as before, bare, but growing in the shape of a ridge.

  • Rebutia krainziana var albiflora makes a very beautiful cactus because its short spines are immaculate white, perfectly pectinate and create a very nice contrast on its dark skin. Its flowers, numerous, are white, a little creamy.

How to grow cactus Rebutia krainziana?

Rebutia krainziana is easily cultivated in a pot with hole (s) of drainage and off gel (even if a few peaks at -4 ° C are tolerable.

We offer him a cactus soil type substrate (1/3 loam / 1/3 potting soil well decomposed / 1/3 sand or gravel). However a loam, very mineral and not excessively heavy can also be suitable, as long as it is allowed to dry completely between 2 waterings.

Watering: this small globular cactus is growing from April to the end of September, and in vegetative rest the rest of the year. It is only watered during the growing season preferably regularly to allow it to grow and flower. The soil in the pot should be watered thoroughly and then allowed to dry completely before the next watering.

Light: Rebutia krainziana can grow in light shade, partial shade or full sun, but be careful to put it there gradually in the spring, as its visible skin can easily burn and even more that of the naked inermis form.

It can therefore be grown in the house near a window, in a veranda, in a greenhouse not frost or in a cool room in the house in winter and outdoors in the open air during the growing season. In this case, it must be taken out in the shade for a few days, then in the sun protected by a veil or a leaf of fine paper (eg newspaper or white paper) a few more days and finally, in direct sunlight: it needs time to produce reddish pigments to withstand full sun.

Rest season: the dormancy of Rebutia krainziana in winter is essential so that it does not wilt and so that it blooms in spring. Indeed, a completely dry cold period allows floral induction. It is therefore not watered at all between October and March. If possible, it will be installed in a cooler place between 1 and 12 ° C (garage, veranda).

Light is of little importance in winter, because the cactus is at rest.

Repotting and fertilizer : an annual or biennial repotting is worth all the fertilizer inputs. Although more favorable in the spring before restarting watering, this repotting is possible until August. It is essential if you have bought a rebutia from cultivation intensive – it is then in pure soil – it is then necessary to rid the roots of this soil. Unlike leafy plants, no immediate watering, or within 5 days, to allow the roots to heal before a new supply of water.

If you lack the time or suitable soil, a fertilizer NPK balanced can be brought once a month; but be careful, too much fertilizer swells the cactus and makes it more fragile.

Multiplication

Seeds are fun to germinate in the spring. They are sown on the surface and kept on a humid substrate at 20/25 ° C.

The rejections of Rebutia krainziana separate quite easily, especially during repotting.

Species and varieties of Rebutia

About forty species

  • notocactus reduced, small species with bright red flowers
  • Rebutia aurantiaca, with orange flowers
  • Rebutia heliosa, almost without prickles
  • Rebutia aureiflora, with orange-yellow flowers
  • Rebutia (Sulcorebutia) rauschii, with a bluish green body
  • Rebutia torquata, with a more cylindrical body
  • Rebutia senilis, very easy to grow
  • Rebutia muscula, the little mouse cactus
Plants of the same genus

Source: Au Jardin, conseils en jardinage by www.aujardin.info.

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