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Astrophytum myriostigma
cv. Onzuka tricostatum

CACTUSPEDIA       

 


This is a very nice and super selected plant, 3 rounded ribs and very nice V marking.
 

Description: Astrophytum myriostigma cv Onzuka "tricostatum" with only three ribs - is one of the most sought after cacti, that have fabulous markings much like the ‘kabuto’ asterias. There is a variety of variations in ribs shape and in stems markings.
This cultivar tends to be unstable
, and some of the three ribbed specimens develop additional ribs as they age. Old and big plants which maintain the typical three ribbed shape are very prized. If you are so inclined you can pay large sums of money for some of the best Japanese forms.
Flowers: arise from the areole at the tip of the stem on mature plant (at least 4-5 years old) they are large, funnel-shaped, yellow, 5-7 cm wide. Blooming intermittently throughout the warm months from spring to autumn.
 

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Family: Cactaceae (Cactus Family)

Scientific name:  Astrophytum myriostigma Lemaire
Published in: Cactacearum Genera nova Speciesque novae et omnium in Horto Monvillano cultarum: 4-6 1839 Original description cv.
ONZUKA tricostatum

Conservation status: Listed in CITES appendix 2.

Origin Japan, Garden origin (Nursery produced cultivar)

Etymology: "tricostatum"  just means it has 3 ribs. There are some other varieties of the 3 ribs, such as "nudum tricostatum", "Fukuryiu tricostatum", "Onzuka tricostatum", "Onzuka Fukuryiu tricostatum" etc.
 

 



A. myriostigma cv. Onzuka tricostatum  fukuryiu
With false ribs between the true ribs.

Photo of conspecific taxa, varieties, forms and cultivars of Astrophytum myriostigma:

Cultivation: Although regarded as a choice and difficult plant in cultivation it is relatively easy to grow. It is sometime seen as a grafted plant but grows very well on its own roots too. Use mineral well permeable substratum with little organic matter (peat, humus). Water sparingly from March till October and keep perfectly dry in winter at temperatures from 5 to 15 degrees centigrade. (but it is Hardy to -7°C for short periods) In the rest period no high atmospheric humidity!! Sun Exposure: Light shade to full sun.

Be careful:
The epidermis of ONZUKA  is harder than in the normal myriostigmas and cracks easily if plants are overwatered.

Propagation: By seeds, remembering that  seedlings dislike strong light and dry conditions  and need to be repotted frequently. Eventually, as they become mature, they attain a maximum size of 8-10 cm (20) cm in diameter. However, old plants become senile and have a tendency to succumb to disease and a weak root system. At this stage, as is well known, they die suddenly. So, after they reach 10 cm in diameter grow them slowly, and adopt a new repotting period, using intervals of every 2 - 3 years. Additionally grow them under drier conditions or with stronger sunlight.
But plants are often grafted to accelerate growth as they would generally take at least a five years to reach maturity on their own, but the grafted plants are typical rather tall growing, compared with plants on their own roots that are usually more flat to the ground.



 

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This old page has been moved! Click the link next on the right to enter the new Enciclopedia of Cacti. We hope you find this new site informative and useful.

The Encyclopedia of Cacti