Aloe Marlothii Or Mountain Aloe Useful Care Tips

Aloe marlothii is a wonderful  flowering aloe species. Mountain aloe, spiny aloe, Transvaal aloe,  tree aloe are some other common names of these beauties. And They are endemic plants to South Africa.

If you are an aloe plant lover, Aloe marlothii is a plant which you should never miss having in your garden. 

These are known as frost resistant plants too. Hence, if you are someone who lives in a colder area where you experience some frost, Aloe marlothii  would be quite useful for you. 

Aloe marlothii are a slow growing set of plants. However, it is not a concern at all since they would still look magnificent even if they are young. 

Aloe Marlothii

Aloe marlothii contain spines. However, they would only add grace to the whole look of the plants. They can stand drought as well as weak frost too. 

Hence, they are a special set of plants. However, when you grow them as garden plants, it is vital that you grow them in a suitable growing medium and water them moderately etc. 

Hence, you need to take the following point into account when you are growing the Aloe marlothii plants.

How do I identify Aloe marlothii?

Aloe marlothii plants have a robust appearance. Further they produce bright flowers too. 

Aloe marlothii develop thick gray green leaves. Further Those leaves would form with a broad base to a sharp point. 

They would rise to about 5 feet in height along in a  rosette  which is densely  structured. If you live in a humid area, you will  see how the leaves may appear in a mode vibrant green color.

On the other hand, Aloe marlothii old leaves may start to drape over from the stem and they will form a look of a  skirt or petticoat. 

That feature adds a robust appearance for the plant. Aloe marlothii further carry spines which are reddish brown in color. 

They would form on the lower surfaces, and they would start off densely. However, they would become slender once they mature with age. 

You could spot the spines forming around the margins of each leaf. However, chances are that they would randomly form across the fleshy parts of the plants as well.

Aloe marlothii had an unbranched  stem and on top of that you could find the rosette. The leaves would carry a sharp point. 

The leaves would be 5 feet in length and up to 10 inches in width. The stem of the Aloe marlothii would reach a maximum height of 15 feet and withered leaves would be covering the stem. 

Besides all these,  Aloe marlothii produce flowers in bright red and they would appear in late fall as well as in winter. They would form on a widespread branching panicle where it will have about 30 racemes.

Growth rate

Aloe marlothii are a slow growing set of plants.

Ideally, they need to have 6 feet in width to have an optimal growth. Having said that, You can grow them along with smaller plants in a complimentary garden.

One look care guide

Botanical NameAloe marlothii
Common NameMountain aloe
Spiny aloe
Transvaal aloe
Tree aloe
Plant TypeCactus / succulent
Mature Sizemaximum height of 8 feet – 10 feet
maximum width of 5 feet – 6 feet
Sun ExposureFull sunlight
Soil TypeSandy, loamy
Soil pHacidic  / alkaline  / neutral
Bloom Timelate fall to early winter
Flower ColorRed 
Hardiness ZonesUSDA hardiness zones 9a-11b
Native AreaSouth Africa
Average price 17 USD

How do you take care of  Aloe marlothii?

Light Requirement

When you grow them indoors, you need to grow them in a bright sunny windowsill where the plants can gain bright indirect sunlight

Further expose  them to light shade during the hottest parts of the day. Even if you grow them outdoors, you need to select a spot where they can gain full sunlight.

Temperature and humidity

Aloe marlothii can stand temperatures which are low as 20 degrees Fahrenheit – 50  degrees  Fahrenheit ( -6.7 degrees  to  10 degrees  Celsius)

Having said that, they are tolerant of extreme drought conditions also. Aloe marlothii are special plants since they can tolerate heat as well as light frost both.

Is it cold hardy?

Aloe marlothii are somewhat cold hardy plants. They are tolerant of weak frost for sometime too. However, they would perform well in the aforesaid temperature levels.

USDA Hardiness Zone

Aloe marlothii prefer to thrive in USDA hardiness zones 9a-11b.

Aloe Marlothii

Watering Requirement 

You may consider watering them once a week during summer. As explained in the above, they can go waterless for several weeks as they are drought tolerant plants

Hence, they would be a perfect choice for the people who don’t experience the colder weather conditions. When it comes to watering them in winter, they can survive with light watering in these periods. 

If you end up over watering the plants in winter, it would only bring an unhealthy impact on the plants. 

Literally if you can spot their carrying inflated leaves, it would be a sign of overwatering. Ultimately it would result in rot if you do not treat them well. 

On the other hand, if you spot any dull or too thin leaves that would also be a sign of underwatering.

Aloe marlothii prefer to be in warmer wet summers and dry winters simply due to the fact that they are native to the monsoon season. 

Aloe marlothii are native to semi-arid areas of South Africa. As such ensure that you water them punctually despite where you locate them be it in the garden or in the pot.

Moreover, you need to water them when their soil is completely dry only. Further when watering the pants, you need to water them thoroughly and ensure that the excess water is draining away from the draining holes.

Soil Requirement Type / pH

Aloe marlothii are tolerant of soil mixes in a wide array. They can thrive in sandy, loam soil mix or even in acidic alkaline soil mix. 

Besides, they can also perform well in soil mix which have a neutral ph. level as well. If there is clay in excess in the soil mix it would lead to over watering as  it will be too dense for them to handle.

One part of compost, one part of river sand to two parts of heavy clay soil would be a perfect soil  mix for the Aloe marlothii if you particularly live in a damp region. 

If you live in an arid environment, you can use undiluted soil as they will retain moisture for extended periods.

Moreover, you may consider adding bone meal as they would reduce the potential of having root rot.

Aloe marlothii requires a well-drained soil, composed of one third of sand or pebbles, to prevent roots rotting.

Also leaf rotting can occur, if you wet too much the leaves while watering and you water too much frequently.

If you grow them outdoors, ensure that you grow them in a sandy soil mix which is light. Alternatively, you can make a hold which has a width of half a meter and fill it with pumice , quartz sand .

Pot size Potting and Repotting

Aloe marlothii are slow growing plants. Hence, you do not have to repot the plants often.

Having said that, if you had freshly purchased  them from the garden stores, you need to consider repotting them. 

You may practice the general succulent and cactus repotting practices to repot them. 

Moreover , you need to go ahead with a porous material pot which has at least one draining hole in the bottom that would be ideal for the optimal growth of the Aloe marlothii plants.

Where to Plant

Strong sunlight level is critical for the optimal growth of the Aloe marlothii plants. Hence if you plant them in the garden, ensure they can gain sufficient sunlight. 

They would always prefer to have a warmer climate. Hence if you are expecting adverse colder weather conditions for extended periods, you need to bring them indoors. Further ensure that you choose  porous pots.

Fertilizer and time of year

Aloe marlothii do not require fertilizers regularly. However, you may consider feeding them when they are actively growing as it will provide extra nutrients for their growth.


Aloe marlothii produce flowers in bright red. Their flowering season would be late fall to early winter.  They contain about 30 racemes which would usually grow horizontally. 

Aloe marlothii flowers have an inflorescence. Further chances are that they may form in orange yellow too. They are attractive for songbirds and for hummingbirds as well.


Aloe marlothii will be dormant in winter. During their dormancy, you need to skip feeding them and watering them.


As well as other Aloe plants, Aloe marlothii are toxic for people as well as for pets.

Common bugs and illnesses

Aloe marlothii are resilient plants. Hence, they can contend strongly against the attacks from pests and most other diseases as well.

However, if you over water them, it would lead to rot. Additionally, pests such as scale insects, mealybugs, mites’ snout beetles and rust  fungus could invade them on and off particularly   if there is a favorable  condition for them.

Aloe Marlothii

How to propagate Aloe marlothii 

When Aloe marlothii grow in the wild, they propagate through wind. Hence, when you grow them in your garden, they can easily spread  through the wind

Besides, you can use the Aloe marlothii seeds and propagate them in a container which has a draining hole in the bottom. 

Next you can place some stones at the bottom of the container . Next add some compost and then  add a sterile soil layer afterwards.

If not, you may sow seeds  in river sand and cover them with a sand layer. Next do a light misting and place them in a spot where they can gain direct sunlight. 

Water them morning to afternoon and reduce watering them once they complete germination. You can transfer the seedling into a new pot. 

You need to ensure that you add a soil mix which is explained in the above. You need to conduct the seeds propagation method in spring to summer.

Aloe marlothii benefits 

Many people tend to use the Aloe marlothii in sunscreens. They would protect your skin from UV rays and hence why people use them in sunscreens. 

They would be perfect additions for Mediterranean,  cottage and rock gardens. Moreover, Zulu people have used them to treat the roundworms . 

Further it has been used to treat stomach issues as well. Further medical experts have used the Aloe marlothii for some medical studies too.


Before wrapping this up, trust this article gives you a broader view of how you should look after the Aloe marlothii, the modes of propagating them and the diseases and the pests  attacks they may come across etc.

Credit to : Winston James
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About author

I’m Dr. Chamika, As a hobby love talking about plants and showing you that taking care of indoor plants. My website is knowledge I’ve learned over the years and continue to learn about growing succulents. If you’re a succulent lover, then you have come to the correct place.