Peruvian Old Lady
Espostoa melanostele (Vaupel) Borg is the correct and accepted scientific name for this species of cactus in the Cactaceae Family. It was named and described by John Borg in Cacti in 1937. It was first named Cephalocereus melanostele Vaupel and described by Friedrich Karl Johann Vaupel in Botanische Jahrbuecher fuer Systematik in 1913.
Plants of the World Online lists 11 accepted species in the Espostoa genus. The genus was named and described by Nathaniel Lord Britton and Joseph Nelson Rose in Cactaceae in 1920.
Espostoa melanostele subsp. nana (F.Ritter) G.J.Charles is an accepted infraspecific name for this species. It was described as such by Graham Charles in Cactaceae Systematics Initiatives in 2002. It was first named and described as a separate species, Espostoa nana F.Ritter by Friedrich Ritter in Taxon in 1964.
Synonyms for the Espostoa melanostele in a roundabout way:
Pilocereus haagei Poselg. ex C.F.Först. & Rümpler-Named and described by Heinrich Poselger and Karl Theodor Rümpler in Handbuch der Cacteenkunde in 1886. This is a basionym of Espostoa haagei which became a synonym of Espostoa melanostele later.
Binghamia melanostele (Vaupel) Britton & Rose-Named and described by Nathaniel Lord Britton and Joseph Nelson Rose in Cactaceae in 1920. Cephalocereus melanostele Vaupel was the basionym.
Cereus melanostele (Vaupel) A. Berger-Named and described by Alwin Berger in Kakteen in 1929. Cephalocereus melanostele Vaupel was the basionym.
Cereus melanostele (Vaupel) Werderm.-Named and described by Erich Werdermann in Neue Kakteen in 1931. Cephalocereus melanostele Vaupel was the basionym.
Pseudoespostoa melanostele (Vaupel) Backeb.-Named and described by Curt Backeberg in Cactus Journal in 1933. Cephalocereus melanostele Vaupel was the basionym.
Espostoa haagei (Poselg. ex C.F.Först. & Rümpler) Borg-Named and described by John Borg in Cacti in 1937. Tropicos lists two different authors with Pilocereus haagei Poselg. ex C.F.Först. & Rümpler as the basionym.
Haageocereus melanostele (Vaupel) W.T. Marshall-Named and described by William Taylor Marshall in Cactaceae in 1941. Cephalocereus melanostele Vaupel was the basionym.
Echinopsis melanostele (Vaupel) Molinari-Named and described by Eduardo Antonio Molinari-Novoa in Succulentopi@ in 2015. Cephalocereus melanostele Vaupel was the basionym.
I bought my Espostoa melanostele from Wal-Mart on February 1, 2016. I had gone there a few days before I bought this cactus and many others. They were soaking wet from being watered and STILL in the plastic sleeves from shipping AND the area was very cool! I mentioned this “situation” to an employee and he looked at me like, “huh?” He absolutely paid no attention and they were STILL in their sleeves, standing in water when I went back and bought several plants.
The Espostoa melanostele I brought home was in a 2 1/4” tall x 2 1/2” diameter pot (4 oz.). The plant measured approximately 2 3/4” tall x 1 3/4” wide. The label says:
“Espostoa melanostele is a columnar cactus with dense white hair and golden spines. In time, it will form a branched tree-like column to 7 feet in height. Native to mountainous Peru at elevations to 4,000 to 7,000 feet. Protect from frost and extreme heat.”
Zones: USDA Zones 9b-11 (25-40° F)
Size: 24-72” tall
Light: Full sun to part shade.
Soil: Fast-draining cactus mix
Water: Regular water during the growing period, sparse in winter.
When I bought my potted plants inside for the winter on October 17, 2017, and put them in the basement before moving them upstairs. I took their photos and measured them to check their progress. Some cactus grow so slow you have to measure them from time to time to see that they are growing. When bought this cactus on February 1 (2016) it was 2 3/4″ tall and this time it measured 5 3/8″ tall… It grew more than any of the others.
LLIFLE and other websites have a lot of useful information but here are the highlights:
Espostoa melanostele have white spines covered with white hair that gets thicker with age. The spines are supposed to also turn black with age.
They produce white flowers in late spring through early summer and edible fruit about the size of a grape.
The Wikipedia says, “Horticultural collection and the fact that the plant is slow growing contribute to the fact that the plant is endangered.” Other sources say it is widespread in Peru and can grow up to 7” per year if properly fed and watered during the growing period. Ummm, that’s pretty darn good for a cactus! The IUCN Red List does not list them as a threatened species let alone endangered.
They grow their best when acclimated to full sun. If you grow your Espostoa melanostele inside over the winter, you will need to gradually introduce it to more sun.
Espostoa melanostele offsets readily and needs a lot of space to grow… Hmmm. Wonder when this happens? They can branch out from the base when about 30-36” tall. Let me see… At 7” per year that means it will take at least 4 years before it “may” branch out. GEEZ! Mine only grew approximately 2 3/4″ in about 2 years.
Needs very porous soil, such as a good cactus mix with little organic matter. Well, I have been using 2 parts potting soil with 1 part chicken grit and 1 part perlite. I am told that pumice is better than perlite. I need to do more experimenting because my cactus mix gets hard in the winter…
Llifle says this cactus does better with a little more water than most cactus. Water thoroughly but allow the soil to dry between waterings.
They need bright light in the winter or they could etiolate. They should be in a cooler room over the winter so the plant will go dormant. Water very seldom, if at all, and do not fertilizer over the winter. I kind of screwed up on that one. I have it in bright light from a south window but usually the room isn’t that cool most of the time… Well, at least it isn’t stretching for light.
I really like this Peruvian Old Lady and hope it will continue to do well. Right now it is leaning so I plan to straighten it up this spring. I will continue adding more photos and information as time goes by.
I hope you found this age useful. If you have any comments, questions or suggestions, I would like to hear from you. Please click on “Like” below if you have read this page. It helps us bloggers stay motivated. 🙂 You can click on the links below for further information. Links will take you directly to the information about this plant.
One more thing… Information for the infraspecific taxon, Espostoa melanostele subsp. nana (F.Ritter) G.J.Charles, on Llifle can be found by clicking HERE. It has a photo but the link below does not.