Astrophytum myriostigma var. quadricostatum
Astrophytum myriostigma var. quadricostatum, is a unique and beautiful four-ribbed variety of the typically five-ribbed A.myriostigma AKA the Bishops Cap Cactus.
You will receive one bare-root seed-grown Astrophytum myriostigma var. quadricostatum of similar size to the ones photographed. Please see the third photo which includes an Australian $2 coin for size reference.
The fourth photo shows the mature form and is not for sale.
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Whilst four-ribbed Astrophytum myriostigma are occasionally found in their natural habitat of central and northern Mexico, the one typically seen in cultivation are descendents of a plant in cultivation.
It was first described by M. Mittler in 1841 who wrote "The body of the plant is of elongated round form and has four ribs".
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Astrophytum myriostigma var. quadricostatum requires a sharp, fast-draining mineral-based substrate with only a little organic matter (80-90% mineral).
Grows best in a greenhouse where it can receive plenty of sun without the risk of rainwater landing on the body of the planer.
Water deeply once a week in Summer. Avoid getting water on the cactus itself, try to water around it.
Light feeds with fertiliser can be applied from late spring to the end of summer. Try to source a low-nitrogen and high-potassium fertiliser. An NPK ratio of 1(N) 0.4(P) 1.5(K) is ideal. Always start with small amounts and work up to avoid fertiliser burns. Cacti will only ever require, at most, half the recommended dosage of other plants.
They are frost hardy to -4° (-10°) C.
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Astrophytum myriostigma var. quadricostatum is an easy plant to cultivate but even in optimal conditions growth is very slow.
