Synonyms:

Bisnaga macrodisca
Bisnaga macrodisca subsp. septentrionalis
Echinocactus campylacanthus
Echinocactus macrodiscus
Echinocactus macrodiscus f. multiflorus
Echinocactus macrodiscus var. multiflorus
Echinofossulocactus campylacanthus
Ferocactus macrodiscus var. septentrionalis
Ferocactus macrodiscus subsp. septentrionalis

Habitat:

F. macrodiscus is native to Mexico Central, Mexico Northeast and Mexico Southwest where the plant grows in a very dry area in grasslands and oak (Quercus) forest and can spread up to 2600 m of altitude.

Description:

F. macrodiscus is a globose succulent belonging to the Cactaceae botanical family. The plant is solitary and can reach up to 10 cm tall and 40 cm in diameter. The stem is barrel-shaped in young and columnar in age and it is arranged in many ribs. The 35 pronounced ribs are well-marked and slightly wavy. The stem is dark green to bluish in color and ribs bear round areoles. From the areoles emerge 6-8 radial spines curved inwards, yellow to red colored and 1-4 central spine long and strong brownish-red colored. Blooming occurs in late spring to early summer and the flowers are borne at the apical part of the plant. The flowers are funnel-shaped, white in color with wonderful bright purple stripes on petals. The fruit is yellow and the seeds are black.

Cultivation:

This is a slow growing plant, easy to cultivate. The plant needs a full light sun exposure but is recommended to avoid direct sun-light in the hottest periods. The plant does not like temperatures below 6°C so it needs to be placed indoors in the coldest periods. The soil should be mixed with pumice, clay and loam to allow the drainage and prevent the root rot, the plant is prone to it indeed. Remember to use a perforating pot to drain excess water. Watering can be done regularly in Spring and Summer: during the vegetative period you can water the plant (every 7 days), checking that the soil is completely dry before watering again; in winter you should stop the watering to allow the plant to enter dormancy. If you want a faster and lush growth you can fertilize the plant once a month during the growing season with the specific fertilizers for cacti; stop fertilizing throughout the winter. If the pot starts to be too small for the plant you can repot the plant in a pot 2 cm wider. Repotting should be done early in the growing season with fresh new potting soil. Be careful to red spiders and mealy bugs.

Propagation:

Propagation can be done by cutting or by seed. By cutting you can make the cut during the spring and then let the cutting dry; after a few days the cut surface will dry and a callus will form, then place the cutting in a mixture of sand, soil and pumice. To increase the success of propagation you can make two or more cuttings at the same time. For cuttings it is recommended temperatures around 20 °C. By seed it is very simple to propagate the plant, it is enough to sow the seed in a sandy loam soil and keep it with a high level of humidity and at temperature of 14 C°.

Curiosity:

The name comes from the Latin “ferox”, that is fierce, given by the presence of colorful, strong numerous and menacing thorns along the ribs of the stem.

Official Web Site:
www.giromagi.com

Italian Blog:
www.giromagicactus.com

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