Gymnocalycium stellatum

Gymnocalycium stellatum

Scientific Name

Gymnocalycium stellatum (Speg.) Speg.

Synonyms

Gymnocalycium stellatum subsp. stellatum, Gymnocalycium asterium, Gymnocalycium obductum

Scientific Classification

Family: Cactaceae
Subfamily: Cactoideae
Tribe: Trichocereeae
Genus: Gymnocalycium

Description

Gymnocalycium stellatum is a beautiful, slow-growing cactus with a noticeably flatten body, at first solitary, later clustering. The stem is dark grayish-brown to olive green, flattened-globose, with 7 to 11 ribs and up to 4 inches (10 cm) in diameter. The spines are 3 to 5, dark brown, becoming grey with age, straight to slightly curved and flattened against the stem. The flowers are creamy-white with a dull red throat, up to 2.6 inches (6.5 cm) long and up to 1.8 inches (4.5 cm) in diameter. They appear in late spring.

Hardiness

USDA hardiness zones 9b to 11b: from 25 °F (−3.9 °C) to 50 °F (+10 °C).

How to Grow and Care

Some Gymnocalyciums are shade-seeking in the wild, among shrubs or grasses, while others grow completely exposed. Some will, therefore, need a light shading from the sun in the hottest months, but to overdo this will result in the loss of flowers.

The balance of the potting medium should be sufficient to allow good drainage so that the plants do not sit in soggy soil for more than a day or two after watering.

Watering in the summer months, while the plants are growing well can be frequent (weekly for small plants in small pots), but always allowing the compost nearly to dry out before rewatering. Watering in the winter months at all is unwise and certainly not necessary. The difficult times are spring and autumn.

Those species which produce offsets can be readily propagated by cuttings. Gymnocalycium seed germinates well when fresh and will keep for a few years if stored in cold conditions.

Learn more at How to Grow and Care for Gymnocalycium.

Origin

Gymnocalycium stellatum is native to Argentina.

Links

  • Back to genus Gymnocalycium
  • Succulentopedia: Browse succulents by Scientific Name, Common Name, Genus, Family, USDA Hardiness Zone, Origin, or cacti by Genus

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Gymnocalycium Stellatum экзотический цветущий цветок редкое семя кактуса 30 SEEDS.

Gymnocalycium Stellatum экзотический цветущий цветок редкое семя кактуса 30 SEEDS.

Что вы получаете: 30 Gymnocalycium stellatum
Семена.
Высококачественные семена.
США продавец.
Поставляется без инструкций.

Хорошая влага, хороший дренаж, очень яркий свет, тепло и аэрация являются важными факторами для высоких темпов прорастания. Прорастание займет от недели до 4 месяцев. Не сдавайтесь на семена, сохраняя вашу почву постоянно влажной обеспечит окончательный успех.

Заполните горшок с хорошей дренажной почвой. Вы можете использовать 50% регулярного заливки почвы с 50% грубого песка, тонкой пемзы или песка. Удалите любые большие кусочки
Поместите семена сверху.
Добавьте тонкий верхний слой песка или грубого песка.
Вода до замачивания.
Пусть избыток воды капает прочь.
Положите контейнер с семенами в мешок застежки-молнии. Убедитесь, что влажность высокая.
Семена прорастают в ярких и теплых условиях.
Увеличьте вентиляцию, когда большинство саженцев появились.
Никогда не позволяйте саженцам высохнуть. Держите полива кастрюлю из-под Применить хорошую вентиляцию, чтобы предотвратить плесень.

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Gymnocalycium stellatum - garden

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Origin and Habitat: Argentina (Cordoba, Catamarca)

Accepted name in llifle Database:
Gymnocalycium stellatum (Speg.) Speg.
Anales Soc. Ci. Argent. 99: 142 (1925), nom. nov. Notes: Echinocactus stellatus Spegazzini non Scheidw.
Synonymy: 6

  • Gymnocalycium stellatum (Speg.) Speg.
    • Echinocactus stellatus Speg.
    • Gymnocalycium asterium A.Cast.
    • Gymnocalycium quehlianum var. stellatum (Speg.) Dölz
  • Gymnocalycium stellatum var. paucispinum (Backeb.) R.Strong
    • Gymnocalycium asterium var. paucispinum Backeb.
Accepted name in llifle Database:
Gymnocalycium stellatum var. flavispinum Bozsing ex H.Till & W.Till
Gymnocalycium 9(1): 172 (1996)

Accepted name in llifle Database:
Gymnocalycium stellatum subs. occultum Frič ex H.Till & W.Till
Gymnocalycium 9(2): 176 (1996)
Synonymy: 2

  • Gymnocalycium stellatum subs. occultum Frič ex H.Till & W.Till
    • Gymnocalycium occultum (Frič ex H.Till & W.Till) H.Till

Description: Gymnocalycium stellatum (syn: G. asterium) is a beautiful slowly growing plant with a noticeably flatten body, at first solitary, later clustering. This species is characterized by some variability in the length and has received many names.
Stem: Dark greyish-brown to olive coloured epidermis, flattened globose, 7.5-10 cm in diameter. Will offset after a considerable period of time.
Ribs: 7-11, flat rounded, without prominent chin-like protrusions.
Spines: 3-5 dark brown, becoming grey with age, spider-like, add-pressed, short, straight to slightly curved and flattened against the stem (rarely sticking out - easy cactus to handle)
Flowers: Creamy-white with a dull red throat, up to 6,5 cm. long, 4,5 cm. diameter.
Fruits: Cylindrical.
Blooming season: Flowers are produced in late spring and remain open for up to twelve days.

Subspecies, varieties, forms and cultivars of plants belonging to the Gymnocalycium stellatum group

Notes: The 'Gymnocalycium asterium' (asterias) synonym was recently deemed an illegitimate name during reclassifications, but it is still widely used.

Bibliography: Major references and further lectures
1) Edward Anderson “The Cactus family” Timber Press, Incorporated, 2001
2) David R Hunt Nigel P Taylor Graham Charles International Cactaceae Systematics Group. "The New Cactus Lexicon" dh books, 2006
3) Roberto Kiesling, Omar E. Ferrari “Cien cactus argentinos” Editorial Albatros, 2005
4) N. L. Britton, J. N. Rose “The Cactaceae. Descriptions and Illustrations of Plants of the Cactus Family.” Volume 4, The Carnegie Institution of Washington, Washington 1923
5) Curt Backeberg “Die Cactaceae: Handbuch der Kakteenkunde” Gustav Fischer Verlag, Stuttgart New York 1982–1985
6) James Cullen, Sabina G. Knees, H. Suzanne Cubey "The European Garden Flora Flowering Plants: A Manual for the Identification of Plants Cultivated in Europe, Both Out-of-Doors and Under Glass" Cambridge University Press, 11/Aug/2011


- Form flat greyish/brown stem with few variable spider spines Photo by: Valentino Vallicelli
Gymnocalycium stellatum Photo by: Cactus Art
Gymnocalycium stellatum Photo by: Alexander Arzberger
Gymnocalycium stellatum Photo by: Gennaro Re
Gymnocalycium stellatum Photo by: Cactus Art
Gymnocalycium stellatum Photo by: Valentino Vallicelli

Cultivation and Propagation: Gymnocalycium stellatum is supposed to be one of the most difficult species in cultivation, and very slow to get to a reasonable size. It will offset after a considerable period of time.
Soils: It likes very porous standard cactus mix soil. Prefer a low pH compost, avoid substrata rich in limestone otherwise growth will stop altogether.
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. Use pot with good drainage.
Watering: It is a summer-growing species that needs regular water in summer, but do not overwater (Rot prone), keep dry in winter at a minimum temperature of 0°C.
Fertilization: Feed with a high potassium fertilizer in summer.
Hardiness: Reputedly resistant to frost if kept on the dry side prior to, and during, cold weather (hardy to -12 C ° C, or less for short periods).
Exposition: The plant tolerates extremely bright situations but enjoys filtered sunlight or afternoon shade, inside it needs bright light, and some direct sun. Tends to bronze in strong light, 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.
Uses: It is an excellent plant for container growing. It always looks good and stays small. It look fine in a cold greenhouse and frame or outdoor in a rockery.
Pests & diseases: It may be attractive to a variety of insects, but plants in good condition should be nearly pest-free, particularly if they are grown in a mineral potting-mix, with good exposure and ventilation. Nonetheless, there are several pests to watch for:
- Red spiders: Red spiders may be effectively rubbed up by watering the plants from above.
- Mealy bugs: Mealy bugs occasionally develop aerial into the new growth among the wool with disfiguring results, but the worst types develop underground on the roots and are invisible except by their effects.
- Scales: Scales are rarely a problem.
- Rot: This species is particularly easy and accommodating, seldom suffer of cryptogamic diseases. Rot it is only a minor problem with gymnocalyciums if the plants are watered and “aired” correctly. If they are not, fungicides won't help all that much.
Propagation: Direct sow after last frost(seldom produces offsets). Seeds germinate in 7-14 days at 21-27° C in spring, remove gradually the glass cover as soon the plants will be well rooted (ca 1-2 weeks) and keep ventilated, no full sun for young plants!


Gymnocalycium stellatum - garden

  • Llifle Home
  • Cacti
  • Content
    • Monstruos
    • Crested
    • Variegated
    • Albinos
    • Chimaeras
    • Short Spines & Spineless
    • Caudiciforms
    • Epiphytes
    • Winter-Hardy Succulents
    • Trees
    • Perennials
  • Contribute
    • Send your photos
    • Donate

Accepted Scientific Name: Gymnocalycium stellatum (Speg.) Speg.
Anales Soc. Ci. Argent. 99: 142 (1925), nom. nov. Notes: Echinocactus stellatus Spegazzini non Scheidw.

Origin and Habitat: Argentina (Cordoba, Catamarca)

Accepted name in llifle Database:
Gymnocalycium stellatum (Speg.) Speg.
Anales Soc. Ci. Argent. 99: 142 (1925), nom. nov. Notes: Echinocactus stellatus Spegazzini non Scheidw.
Synonymy: 6

  • Gymnocalycium stellatum (Speg.) Speg.
    • Echinocactus stellatus Speg.
    • Gymnocalycium asterium A.Cast.
    • Gymnocalycium quehlianum var. stellatum (Speg.) Dölz
  • Gymnocalycium stellatum var. paucispinum (Backeb.) R.Strong
    • Gymnocalycium asterium var. paucispinum Backeb.
Accepted name in llifle Database:
Gymnocalycium stellatum var. flavispinum Bozsing ex H.Till & W.Till
Gymnocalycium 9(1): 172 (1996)

Accepted name in llifle Database:
Gymnocalycium stellatum subs. occultum Frič ex H.Till & W.Till
Gymnocalycium 9(2): 176 (1996)
Synonymy: 2

  • Gymnocalycium stellatum subs. occultum Frič ex H.Till & W.Till
    • Gymnocalycium occultum (Frič ex H.Till & W.Till) H.Till

Description: Gymnocalycium stellatum var. paucispinum is a small cactus barely rising above ground level, usually solitary in habitat, but sometime branching basally in cultivation to form clusters. It differs from the standard Gymnocalycium stellatum (a.k.a. Gymnocalycium asterias) for the flat greyish/brown stems with only three stronger addpressed spines in each areole.
Stem: Dark greyish-brown to olive coloured epidermis, flattened globose, 7,5-10 cm in diameter. Will offset after a considerable period of time.
Ribs: 7-11, flat rounded, without prominent chin-like protrusions.
Spines: 3 dark brown, becoming grey with age, add-pressed, usually slightly stronger and longer than in the common forms of Gymnocalycium stellatum, straight to slightly curved and flattened against the stem
Flowers: Creamy-white with a dull red throat, up to 6,5 cm long, 4,5 cm. diameter.
Fruits: Cylindrical.
Blooming season: Flowers are produced in late spring and remain open for up to twelve days.

Subspecies, varieties, forms and cultivars of plants belonging to the Gymnocalycium stellatum group

Notes: The 'Gymnocalycium asterias ( or asterium)' synonym was recently deemed an illegitimate name during reclassifications, but it is still widely used.

Bibliography: Major references and further lectures
1) Edward Anderson “The Cactus family” Timber Press, Incorporated, 2001
2) David R Hunt Nigel P Taylor Graham Charles International Cactaceae Systematics Group. "The New Cactus Lexicon" dh books, 2006
3) Roberto Kiesling, Omar E. Ferrari “Cien cactus argentinos” Editorial Albatros, 2005
4) N. L. Britton, J. N. Rose “The Cactaceae. Descriptions and Illustrations of Plants of the Cactus Family.” Volume 4, The Carnegie Institution of Washington, Washington 1923
5) Curt Backeberg “Die Cactaceae: Handbuch der Kakteenkunde” Gustav Fischer Verlag, Stuttgart New York 1982–1985
6) James Cullen, Sabina G. Knees, H. Suzanne Cubey "The European Garden Flora Flowering Plants: A Manual for the Identification of Plants Cultivated in Europe, Both Out-of-Doors and Under Glass" Cambridge University Press, 11/Aug/2011.


Gymnocalycium stellatum var. paucispinum Photo by: Alexander Arzberger
Gymnocalycium stellatum var. paucispinum Photo by: Cactus Art
Gymnocalycium stellatum var. paucispinum Photo by: Cactus Art
Gymnocalycium stellatum var. paucispinum Photo by: Cactus Art
Gymnocalycium stellatum var. paucispinum Photo by: Cactus Art
Gymnocalycium stellatum var. paucispinum Photo by: Cactus Art
Gymnocalycium stellatum var. paucispinum Photo by: Valentino Vallicelli
Gymnocalycium stellatum var. paucispinum Photo by: Cactus Art

Cultivation and Propagation: Gymnocalycium stellatum is supposed to be one of the most difficult species in cultivation, and very slow to get to a reasonable size. It will offset after a considerable period of time.
Soils: It likes very porous standard cactus mix soil. Prefer a low pH compost, avoid substrata rich in limestone otherwise growth will stop altogether.
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. Use pot with good drainage.
Watering: It is a summer-growing species that needs regular water in summer, but do not overwater (Rot prone), keep dry in winter at a minimum temperature of 0°C.
Fertilization: Feed with a high potassium fertilizer in summer.
Hardiness: Reputedly resistant to frost if kept on the dry side prior to, and during, cold weather (hardy to -12 C ° C, or less for short periods).
Exposition: The plant tolerates extremely bright situations but enjoys filtered sunlight or afternoon shade, inside it needs bright light, and some direct sun. Tends to bronze in strong light, 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.
Uses: It is an excellent plant for container growing. It always looks good and stays small. It look fine in a cold greenhouse and frame or outdoor in a rockery.
Pests & diseases: It may be attractive to a variety of insects, but plants in good condition should be nearly pest-free, particularly if they are grown in a mineral potting-mix, with good exposure and ventilation. Nonetheless, there are several pests to watch for:
- Red spiders: Red spiders may be effectively rubbed up by watering the plants from above.
- Mealy bugs: Mealy bugs occasionally develop aerial into the new growth among the wool with disfiguring results, but the worst types develop underground on the roots and are invisible except by their effects.
- Scales: Scales are rarely a problem.
- Rot: This species is particularly easy and accommodating, seldom suffer of cryptogamic diseases. Rot it is only a minor problem with gymnocalyciums if the plants are watered and “aired” correctly. If they are not, fungicides won't help all that much.
Propagation: Direct sow after last frost(seldom produces offsets). Seeds germinate in 7-14 days at 21-27° C in spring, remove gradually the glass cover as soon the plants will be well rooted (ca 1-2 weeks) and keep ventilated, no full sun for young plants!


Watch the video: 15 Variedades de Gymnocalycium