Mammillaria rhodantha-Rainbow Pincushion

Mammillaria rhodantha on 7-19-16, #274-51.

Rainbow Pincushion

Mammillaria rhodantha

mam-mil-AR-ee-uh  rho-DAN-tha

Synonyms of Mammillaria rhodantha (115) from Plants of the World Online:

Cactus acicularis Kuntze, Cactus atratus Kuntze, Cactus aureiceps (Lem.) Kuntze, Cactus canescens Moc. & Sessé ex DC., Cactus capillaris J.M.Coult., Cactus centrispinus (Pfeiff.) Kuntze, Cactus chrysacanthus (Link & Otto ex Pfeiff.) Kuntze, Cactus crassispinus (Pfeiff.) Kuntze, Cactus fulvispinus (Haw.) Kuntze, Cactus fuscatus (Link & Otto ex Pfeiff.) Kuntze, Cactus odierianus (Lem.) Kuntze, Cactus phaeacanthus (Lem.) Kuntze, Cactus pulcher (Haw.) Kuntze, Cactus pyrrhochracanthus (Lem.) Kuntze, Cactus rhodanthus (Link & Otto) Kuntze, Cactus rhodanthus var. sulphureospinus J.M.Coult., Cactus ruficeps Kuntze, Cactus rutilus (Zucc. ex Pfeiff.) Kuntze, Cactus stenocephalus (Scheidw.) Kuntze, Cactus stueberi (C.F.Först.) Kuntze, Cactus tentaculatus (Link & Otto ex Pfeiff.) Kuntze, Mammillaria acicularis Lem., Mammillaria andreae (Otto ex Pfeiff.) Salm-Dyck, Mammillaria atrata Hook., Mammillaria aurata Pfeiff., Mammillaria aurea C.F.Först., Mammillaria aureiceps Lem., Mammillaria bonavitii Repp., Mammillaria calacantha Tiegel, Mammillaria centrispina Pfeiff., Mammillaria chrysacantha Link & Otto ex Pfeiff., Mammillaria crassispina Pfeiff., Mammillaria crassispina var. gracilior Salm-Dyck, Mammillaria diacentra Jacobi, Mammillaria erinacea H.L.Wendl., Mammillaria eugenia Salm-Dyck, Mammillaria fera-rubra F.Schmoll ex R.T.Craig, Mammillaria flaviceps Scheidw. ex Labour., Mammillaria floccigera Otto ex Salm-Dyck, Mammillaria fulvispina Haw., Mammillaria fulvispina var. pyrrhocentra Salm-Dyck, Mammillaria fulvispina var. rubescens Salm-Dyck, Mammillaria fuscata Link & Otto ex Pfeiff., Mammillaria fuscata var. russea (A.Dietr.) Backeb., Mammillaria fuscata var. sulphurea (C.F.Först.) Backeb., Mammillaria hybrida Pfeiff., Mammillaria imbricata Wegener, Mammillaria inuncta Hoffmanns., Mammillaria karwinskiana var. centrispina (Pfeiff.) Salm-Dyck, Mammillaria mollendorffiana Shurly, Mammillaria mundtii K.Schum., Mammillaria neglecta Salm-Dyck, Mammillaria nigricans Fennel, Mammillaria odieriana Lem., Mammillaria odieriana var. aurea Salm-Dyck, Mammillaria odieriana var. rigidior Salm-Dyck, Mammillaria olivacea Pfeiff., Mammillaria pfeifferi J.R.Booth ex Scheidw., Mammillaria pfeifferi var. altissima Scheidw., Mammillaria pfeifferi var. dichotoma Scheidw., Mammillaria pfeifferi var. flaviceps Scheidw., Mammillaria pfeifferi var. fulvispina Scheidw., Mammillaria pfeifferi var. variabilis Scheidw., Mammillaria phaeacantha Lem., Mammillaria pulchra Haw., Mammillaria punctata Labour. ex C.F.Först. & Rümpler, Mammillaria pyrrhocentra Salm-Dyck, Mammillaria pyrrhochracantha Lem., Mammillaria radula Scheidw. ex C.F.Först., Mammillaria rhodantha var. andreae Otto ex Pfeiff., Mammillaria rhodantha var. aureiceps (Lem.) Salm-Dyck, Mammillaria rhodantha subsp. aureiceps (Lem.) D.R.Hunt, Mammillaria rhodantha var. callaena K.Schum., Mammillaria rhodantha var. centrispina (Pfeiff.) Link ex C.F.Först., Mammillaria rhodantha var. chrysacantha (Link & Otto ex Pfeiff.) K.Schum., Mammillaria rhodantha var. crassispina (Pfeiff.) K.Schum., Mammillaria rhodantha subsp. fera-rubra (F.Schmoll ex R.T.Craig) D.R.Hunt, Mammillaria rhodantha var. fuscata (Link & Otto ex Pfeiff.) K.Schum., Mammillaria rhodantha subsp. fuscata (Link & Otto ex Pfeiff.) Rogoz. & Plein, Mammillaria rhodantha var. major Monv. ex Lem., Mammillaria rhodantha subsp. mccartenii D.R.Hunt, Mammillaria rhodantha subsp. mollendorffiana (Shurly) D.R.Hunt, Mammillaria rhodantha var. neglecta Pfeiff., Mammillaria rhodantha f. neglecta (Salm-Dyck) Voss, Mammillaria rhodantha var. pfeifferi (J.R.Booth ex Scheidw.) K.Schum., Mammillaria rhodantha var. pyramidalis K.Schum., Mammillaria rhodantha var. rubens Pfeiff., Mammillaria rhodantha var. ruberrima K.Schum., Mammillaria rhodantha var. rubescens Salm-Dyck, Mammillaria rhodantha var. rubra K.Schum., Mammillaria rhodantha var. ruficeps (Lem.) Salm-Dyck, Mammillaria rhodantha subsp. santarosensis Rogoz. & Plein, Mammillaria rhodantha var. stenocephala K.Schum., Mammillaria rhodantha f. sulphurea (C.F.Först.) Voss, Mammillaria rhodantha var. sulphurea (C.F.Först.) Salm-Dyck, Mammillaria rhodantha f. tentaculata (Link & Otto ex Pfeiff.) Schelle, Mammillaria rhodantha var. wendlandii Pfeiff., Mammillaria robusta Otto ex C.F.Först., Mammillaria ruficeps Lem., Mammillaria russea A.Dietr., Mammillaria rutila Zucc. ex Pfeiff., Mammillaria rutila var. octospina Scheidw., Mammillaria rutila var. pallidior Salm-Dyck, Mammillaria stenocephala Scheidw., Mammillaria stueberi C.F.Först., Mammillaria sulphurea C.F.Först., Mammillaria tentaculata Link & Otto ex Pfeiff., Mammillaria tentaculata var. conothele Monv. ex Labour., Mammillaria tentaculata var. picta C.F.Först. & Rümpler, Mammillaria verticealba Repp., Mammillaria verticealba var. zacatecasensis Repp., Neomammillaria aureiceps (Lem.) Britton & Rose, Neomammillaria mundtii (K.Schum.) Britton & Rose, Neomammillaria phaeacantha (Lem.) Britton & Rose, Neomammillaria rhodantha (Link & Otto) Britton & Rose

Mammillaria rhodantha Link & Otto is the correct and accepted scientific name of this plant. It was first described by Johann Heinrich Friedrich Link AND Christoph Friedrich Otto in Icones Plantarum Selectarum in 1828.

The genus, Mammillaria Haw., was named and described by Adrian Hardy Haworth in Synopsis Plantarum Succulentarum in 1812. According to Plants of the World Online by Kew, there are 162 accepted species in the Mammillaria genus as of when I am updating this page on 12-23-19. That number is likely to change and has done so many times since I started blogging.


Mammillaria rhodantha on 5-31-17, #339-33.

When I first bought this plant from Wal-Mart on February 1, 2016, the label just said Mammillaria species. I looked at a lot of photos on the CactusGuide and Llifle (Encyclopedia of Life) and could not figure it out. Finally, I sent an email and photos to Daiv Freeman of the CactusGuide and he suggested it was a Mammillaria rhodantha. Even though the red spines would be a sure distinguishing feature, apparently I hadn’t looked at enough photos to get that far. There are many red or brownish-red spined species of cactus in several other genera besides Mammillaria.


Mammillaria rhodantha on 9-5-17, #371-19.

Mammillaria rhodantha is native to much of Mexico so they are not an endangered species.


Mammillaria rhodantha bud on 9-27-17, #379-9.

One day in September I noticed it had a bud… It must have already been there for quite a while.


Mammillaria rhodantha on 10-11-17, #382-51.


Family: Cactaceae
Origin: Mexico
Zones: USDA Zones 9a-11 (20 to 40° F).
Size: 6-12” tall (15-30 cm).
Light: Sun to part shade.
*Soil: Fast-draining. Potting soil amended with pumice or perlite and grit.
Water: Average during the growing period, barely if any during the winter.
Flowers: Pinkish flowers about any time of the year.

*There are many cactus and succulent recipes online. I used 2 parts Miracle Grow or Schultz potting soil with 1 part additional perlite and 1 part chicken grit for many years. Many cactus and succulent enthusiasts recommend using pumice in place of perlite and grit. I began using a mixture of about 50/50 Miracle Grow Potting Soil and pumice in the Fall of 2018 with favorable results. I repot any time of the year as necessary but I have found that repotting in the fall keeps their soil nice and loose for the winter.

You can read my Cactus Talk & Update and Cactus & Succulent Tips to get my opinion about growing cactus and succulents.


Mammillaria rhodantha at 3 3/4″ tall x 3″ wide on 10-17-17, #384-19.

Temperatures were getting cooler so I had to start thinking about bringing plants inside for the winter. You need to give your plants a good look before you bring them inside to make sure no bugs are coming in with them. Sometimes as cooler temps approach some insects may try to hibernate under leaves that have accumulated in the pot or around the base of the plant. I also measure my cactus and succulents periodically because some cactus grows so slow I like to measure them from time to time. On October 17, I moved the plants into the basement and the Mammillaria rhodantha measured 3 3/4″ tall x 3″ wide (including the spines). I usually don’t include the spines when I measure, but I kind of screwed up in 2017 and included the spines in the measurement. When I was finished cleaning, measuring and taking photos I moved most of the plants upstairs for the winter.


Mammillaria rhodantha from the top showing many buds on 10-17-17, #384-20.

The Mammillaria rhodantha had a few more very small buds. Now, let’s see how long it takes for the flowers to open…


Mammillaria rhodantha on 10-31-17, #387-20.

I put several cactus and succulents in the kitchen windowsill where they receive a good amount of morning sun. The Mammillaria rhodantha was really glowing in the sun.


Mammillaria rhodantha on 11-6-17, #390-5.

I take a lot of photos but sometimes I don’t have a lot of words…



Mammillaria rhodantha on the evening of on 1-18-18, #401-10.

The potted plants and I are anxiously waiting for warmer weather…


Mammillaria rhodantha on 5-17-18, #443-62.

Finally, once warmer temperatures arrived I moved all the potted plants back outside for the summer.


Mammillaria rhodantha on 7-29-18, #487-69.

On July 4 I had to relocate the tables I keep my plants on. We had a Japanese Beetle invasion and the plant tables were under a Chinese Elm tree which the beetles love. The beetles were beginning to sample the other plants so I put most of the cactus on the back porch and most of the succulents and other plants on the front porch. The back porch isn’t covered so the cactus will receive full sun. The Mammillaria rhodantha is beginning to grow a few buds again.


Mammillaria rhodantha on 8-26-18, #499-27.

By August 26 the buds were getting larger.


Mammillaria rhodantha at 4″ tall x 2 7/16″ wide on 10-10-18, #519-51.

I had to move the potted plants inside for the winter on October 10 because the forecast was calling for an “F” in a few days and the nighttime temperatures were getting cooler. I usually measure the cactus and succulents when I bring them inside and the Mammillaria rhodantha was 4″ tall x 2 7/16″ wide. Last year I messed up and included the spines in the measurement but this year I remembered not to.


Mammillaria rhodantha with flowers on 10-10-18, #519-52.


Mammillaria rhodantha on 11-29-18, #534-26.

November 29 was a nice spring-like day, so I took the cactus to the back porch for a photoshoot. I was working on a post to show the difference between the cactus in my collection.


Mammillaria rhodantha buds on 11-29-18, #534-27.

It takes a LONG time for the buds to open on this plant… Buds form in the axils between the tubercles from the previous year’s growth. There is also a little wool in the axils between the tubercles which disappears with age. Supposedly, maybe on some species, flowering doesn’t occur until after the growth of trichomes becomes inactive.  Here you see buds forming among the wool between some of the tubercles…


Mammillaria rhodantha close-up on 12-1-18, #535-20.

This Mammillaria rhodantha has 4-9 long, reddish-brown, recurving central spines. Other variations do not have reddish-brown spines. It produces 16-24 white (sometimes yellowish) radial spines.

The radial spines on the lower plant can turn somewhat gray looking with age, which Llifle says appear to be dying.

Mammillaria rhodantha divides dichotomously and also produces offsets. Hmmm… I didn’t realize I had so many Mammillaria species that divide dichotomously…


Mammillaria rhodantha from the top on 12-10-18, #538-1.

I took a photo of the top part of this cactus because it is very interesting. Many species have a wooly apex but the Mammillaria rhodantha is especially colorful. The wool on its areoles pretty much disappears as the plant ages.


Mammillaria rhodantha on 6-22-19, #593-34.

Once evening temperatures warmed up I moved the potted plants back outside for the summer. I moved the cactus to the back porch where they could receive full sun.

I was fairly busy during the summer so I didn’t take many photos. All the plants did very well despite a little neglect.


Mammillaria rhodantha at 4 1/2″ tall x 2 1/2″ wide on 10-11-19, #639-73.

I had to bring the potted plants inside on October 11 because an “F” was in the forecast. I always take photos of the plants as I bring them inside and measure the cactus and some of the succulents. The Mammillaria rhodantha measured 4 1/2″ tall x 2 1/2″ wide.


Mammillaria rhodantha from the top on 10-19-19, #643-8.

Although this plant flowers several times over the summer and again in October, it doesn’t produce a lot of flowers. Mammillaria pringlei flowers in the same manner but produces A LOT of flowers. Mammillaria pringlei has been, and still is according to some, a subspecies of Mammillaria rhodantha. Well, I didn’t bring it home for the flowers. I brought it home because of its red spines…

In my opinion, the Mammillaria rhodantha is a great spiny companion and is very easy to grow. Mammillaria species, in general, are very popular because they do so well and come in a variety of shapes and sizes. Many species are readily available and one can get addicted to collecting them.

I will continue adding more photos and information as time goes by. The links below take you directly to information about the species, or genus, for further reading.

I hope you enjoyed this page and maybe found it useful. If you have any comments, questions or suggestions, I would like to hear from you. If you find an error, please let me know. I am not an expert. Please click on “like” if you visited this page. It helps us bloggers stay motivated. 🙂 If you wish, you can send an email to


2 comments on “Mammillaria rhodantha-Rainbow Pincushion

  1. Sharone says:

    Thank you so much for this post & detailed pictorial updates. I got a Rainbow Pincushion as a gift two months ago and I’ve been looking for something like this although this was super comprehensive which I loved to read. I’m going to measure mine and monitor for any updates. I live in the tropics where there’s no much seasonal change. Thanks again for this post.

    Liked by 1 person

    • Hello Sharone! I am glad to hear you have a Mammillaria rhodantha and hope it continues to do well for you. It is a really neat plant with the red spines. I am also glad you enjoyed the page. Take care and thanks for the comment.


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