x Alworthia ‘Black Gem’

Alworthia ‘Black Gem’ after I brought it home on 5-9-19, #570-1.

Alworthia ‘Black Gem’

Aloe speciosa x Haworthia cymbiformis

AL-OH spee-see-OH-suh x ha-WORTH-ee-a  sim-BIH-for-miss

Alworthia is a bigeneric or intergeneric hybrid cross between Aloe speciosa and Haworthia cymbiformis.

Aloe speciosa Baker is the accepted scientific name of one parent of xAlworthia ‘Black Gem’. It was named and described as such by John Gilbert Baker in Journal of the Linnean Society in 1880.

Haworthia cymbiformis (Haw.) Duval is the accepted scientific name of the other parent. It was named and described as such by Henri August Duval in Plantae Succulentae, in Horto Alenconio in 1809. It was first named and described as Aloe cymbiformis by Adrian Hardy Haworth in Transactions of the Linnean Society in 1804.


Alworthia ‘Black Gem’ on 5-9-19, #570-2.

I brought this x Alworthia ‘Black Gem’ home from Wildwood Greenhouse on May 9, 2019. It was unlabeled so I posted photos to the Facebook group called Succulent Infatuation. I usually get a pretty fast response and it is much better than trying to figure it out. Within no time, a member suggested it was a xAlworthia ‘Black Gem’. I did a little research on the name and I think she hit the nail right on the head but we shall see. If I find out this is not an x Alworthia ‘Black Gem’ I will change the name.

The cluster measures approximately 3 1/2” tall x 6 1/8” at the widest point. There are three rosettes plus two newer offsets in the pot. The pot measures 3 7/8” tall x 4 1/2” diameter pot.

Family: Asphodelaceae
Origin: Parents are from South Africa,
Zones: USDA Zones 9b-11 (25-40° F)
Size: About 6” tall
Light: Sun to part shade
Soil: Very well-draining potting mix. Amend potting soil with additional pumice (50/50) or chicken grit and pumice (2-1-1)
Water: Regular watering during the summer but sparingly during the winter.


Alworthia ‘Black Gem’ on 6-16-19, #591-4.

The x Alworthia ‘Black Gem’ is still doing fine on the front porch. It’s a little hard to describe the light there, but I think the succulents get plenty. I just have to remember to water since there is a roof overhead.


x Alworthia ‘Black Gem’ on 7-15-19, #601-4.

The x Alworthia ‘Black Gem’ is enjoying itself on the front porch.


x Alworthia ‘Black Gem’ at 4 1/2″ tall x 8″ wide on 10-11-19, #639-9.

I had to move the plants inside for the winter on October 11 because an “F” was in the forecast. This has proven to be a great plant so far and measured 4 1/2″ tall x 8″ wide when I moved the plants inside. I think it will be quite a clumper…


x Alworthia ‘Black Gem’ on 11-13-19, #649-3.

I decided to put the x Alworthia ‘Black Gem’ and several other cactus and succulents in larger pots after I brought them inside for the winter. I think fall is a good time to repot so their soil will be nice and loose for the winter.


x Alworthia ‘Black Gem’ at 5 3/4″ tall x 10″ wide on 10-15-20, #747-11.

We made it through the summer with flying colors and this plant looks great! I had to move the plants inside for the winter on 10-15-20 because an “F” was in the forecast. This plant measured 5 3/4″tall x 10″ wide. So, it is growing well.

There is very little information online about this plant so hopefully, I can contribute a little experience as time goes by.

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. Please click on “like” if you visited this page. It helps us bloggers stay motivated. 🙂 You can check out the links below for further reading. The links take you directly to the genus and species of this plant.

(Aloe speciosa/Haworthia cymbiformis)
(Aloe speciosa/Haworthia cymbiformis)
(Aloe speciosa/Haworthia cymbiformis)