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SP2181 Astrophytum myriostigma cv. ONZUKA

Astrophytum myriostigma cv. ONZUKA
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SP2181 € 14,07 1

Descrizione

# # # PIANTA SPECIALE # # # (Esemplare selezionato)
diametro cm. 4, alt. cm. 8, forma classica innestata su Opuntia compressa.

 

Family: Cactaceae (Cactus Family)

Scientific name:  Astrophytum myriostigma Lemaire cv. ONZUKA

Original description: Cactacearum Genera nova Speciesque novae et omnium in Horto Monvillano cultarum: 4-6 1839

Conservation status: Listed in CITES appendix 2.

Origin Japan, Garden origin (Nursery produced cultivar)

 

Astrophytum myriostigma cv. ONZUKA


 

Description: Astrophytum myriostigma is a quite variable species and several breeds do exist. The "Onzuka" is probably the most beautiful, sought after and attractive of all.
The cultivar 'ONZUKA' (In Japanese speaking "Onzuka Ranpo-gyoku") has snowy-white, heavily speckled epidermis with fabulous markings much like the ‘kabuto’ asterias. The white marking varies considerably from plant to plant and there exist an enormous number of different designs, and also plants change their appearance in age and they are full of surprises as they grows.
It was created somewhat by chance in Japan around 1974-1977 by Mr. Tsutomu Onzuka (Hence the name).
He intended to cross a  three-ribbed A. myriostigma with A. myriostigma var. nudum. Subsequently, over several generations of  repeated backcrossed of the the offspring he obtained, unexpectedly,  some strange A. myriostigma characterized by many white dots. It has been called 'ONZUKA.'

 

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  seedlingsdislike 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.