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is pencil cactus poisonous to humans

is pencil cactus poisonous to humans Buy 'Pencil Cactus - Euphorbia tirucalli Firesticks' Care and Growing Guide

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is pencil cactus poisonous to humans Buy 'Pencil Cactus - Euphorbia tirucalli Firesticks' Care and Growing GuideIntroducing the Pencil Cactus, botanically known as Euphorbia tirucalli Fire Sticks (also called Sticks on Fire), a striking succulent prized for its sea coral like appearance and vibrant, loosely branching pencil thin stems that develop brilliant shades of green, orange, and red. Native to Southern Africa, this unique succulent belongs to the Euphorbiaceae (spurge) family, not the cactus family (Cactaceae), though it is commonly referred to as Pencil

Introducing the Pencil Cactus, botanically known as Euphorbia tirucalli ‘Fire Sticks’ (also called Sticks on Fire), a striking succulent prized for its sea coral-like appearance and vibrant, loosely branching pencil-thin stems that develop brilliant shades of green, orange, and red.

Native to Southern Africa, this unique succulent belongs to the Euphorbiaceae (spurge) family, not the cactus family (Cactaceae), though it is commonly referred to as “Pencil Cactus” because of its cactus-like form and upright growth habit. It is also known by several other common names, including fire sticks plant, sticks on fire succulent, fire plant, red pencil tree, milk bush, and Euphorbia tirucalli ‘Rosea’.


When exposed to direct sunlight, the tips turn red, which is why they are also called firesticks.

This fast growing evergreen succulent can grow up to 30 feet tall and 10 feet wide, forming a thicket of brilliantly colored vertical stems with loose branches.

The unusual stems of this firestick plant, which are as thin as pencils, have a reddish-golden hue that becomes yellow in the summer and red again in the winter.

The pencil cactus flowers boast vibrant yellow, pink, or orange blooms in the summer and spring, making them a true showstopper in any garden.

The pencil cactus is extremely drought tolerant and hard to kill, and as a result, is a great, low-maintenance, easy-care plant for your home or garden.

You can grow your pencil cactus indoors year-round as a houseplant. If planting outdoors, it's best to do so in the spring when temperatures are warm and stable. This cactus grows faster than many other cacti, making it a striking addition to your garden or home.

If you cut your pencil cactus, be careful—the thick, white sap is toxic and can cause skin irritation, burns, or severe eye irritation if it gets into your eyes. While highly irritating, some cultures have historically used it in traditional medicine for treating growths like warts and tumors, though it is not safe for home remedies. Always wear gloves when handling the plant and wash your hands thoroughly if you come into contact with the sap.

When and How to Water Your Pencil Cactus 

This pencil cactus firestick plant can withstand droughts and doesn't need to be watered frequently to survive. Watering these perennial succulents should be done every 3–4 weeks or when the soil feels dry. Let the soil completely dry out between waterings, and if in doubt, give your fire plant a little more time before watering again.  Less water is needed for humid locations and indoor spaces. Pay attention to how the pencil cactus looks and adjust the watering accordingly.

Remember that succulents in the desert can go for weeks or even months without water, so water them sparingly during their rest phase and moderately during their active growing season.

Pro Tip

Most people like to see the red tips that give this Euphorbia tirucalli its firestick name. Note that it is stress that causes the tips to go red. So, the art is to stress the firestick plant a bit, but not too much. So, give it a lot of light and water it less than other succulents, so it is thirsty but not dying of thirst.

Overwatering can also cause the Euphorbia tirucalli 'Firesticks' tips to turn red, but it can also lead to root rot and other problems. So, if your pencil cactus is not turning red in full sun, it's possible that it's not experiencing enough stress to produce the anthocyanin pigments or that it's receiving too much water.

Light Requirements - Where to Place Your Pencil Cactus 

Like most succulents, indoors, the Euphorbia tirucalli firesticks need bright, indirect sunlight to thrive, so choose the brightest area in the house.

Potted indoor pencil cacti require four hours of direct sunlight, which can be achieved by locating them on a sunny south or west-facing windowsill. 

If you are growing these firestick succulents outdoors, make sure that they receive at least six hours of direct sunlight per day.

Partial shade may be tolerated as long as your pencil cactus gets the majority of the sunlight that it needs when it's planted outside. This succulent plant won't thrive if left in the shade for a long time. Its colors become more vibrant the more sunlight it receives.

In order to avoid sunburn, it is preferable to acclimatize your pencil cactus first before moving it outdoors or increasing the amount of sunlight it receives.

Optimal Soil & Fertilizer Needs 

The firestick Euphorbia is a succulent plant that likes very airy, porous, nutrient-rich soil with a pH of 5.5–6.5. Succulents require fast-draining soil that dries completely between waterings. Ideally, you want to use our specialized potting mixGo to soil cactus mix blend 1 gal 4 qt cacti succulent dirt compost growing media that contains 5 natural substrates and organic mycorrhizae to promote the development of a strong root system that helps your Euphorbia firesticks Pencil Cactus to thrive. 

When it comes to fertilizing your pencil cactus plant, it only needs a small amount of fertilizer applied once a year in spring. Cacti prefer a fertilizer with lower doses of NPK, with a maximum ratio of 5-10-5 that is higher in phosphorus than nitrogen.

Hardiness Zones & More 

When growing indoors as a houseplant, the Euphorbia firestick can tolerate temperatures between 65 °F and 75 °F. Your Euphorbia firestick plant performs well in temperatures above 30 °F. However, it can withstand temperatures below that, but only for short periods of time.

In the United States, the Euphorbia tirucalli is mostly an indoor plant, but if you live in southern Florida or Hawaii then you can cultivate it outdoors in USDA zones 10 -11.

Growing these pencil cacti in containers is the best option if you live in an area with harsh winters.

By doing this, you can bring your Pencil Cactus indoors during the winter or any time there's a chance of frost or snow. Normal house humidity is fine for this Euphorbia, but it prefers dry conditions. 

Wildlife - Euphorbia tirucalli Attracts the Following Friendly Pollinators

The Euphorbia tirucalli flowers attract a variety of pollinators, such as bees, butterflies, and hummingbirds, with their bright colors and sweet nectar. These pollinators play a crucial role in the ecosystem by helping to fertilize plants and promote biodiversity.

Butterflies
Bees
Hummingbirds
Lady Bugs
Multi Pollinators
Other Birds

According to ASPCA, the Euphorbia tirucalli 'Firesticks' is mildly toxic to humans and pets. It can irritate the skin, eyes, and gastrointestinal tract. However, it is safe to touch as long as precautions are taken to avoid contact with the sap. Wear gloves when handling this plant to prevent any potential skin irritation.

How to Propagate Your Pencil Cactus

When it comes to pencil cactus propagation, one common method is through stem cuttings. Simply take a cutting from a healthy pencil cactus, let it dry for a few days, and then place it in well-draining soil. Another method is through division, where you carefully separate the offsets or side shoots from the main plant and plant them individually.

Key Takeaways

  1. The stems of firesticks are as thin as pencils (hence the name) and turn a fire-red in the winter.
  2. Euphorbia Firesticks is a stunning variety that changes color with the seasons, turning bright red or orange tips in cooler temperatures or full sun.
  3. This succulent has a rapid growth rate, reaching up to 30 feet tall when grown outdoors, with a branching, upright form.
  4. During the spring and summer, the yellow flowers bloom in clusters on the end of the branch, usually for just a few days.

The Bottom Line

Overall, the pencil cactus (Euphorbia Firesticks) is a unique and striking succulent plant that adds a touch of elegance to any space. With its slender, pencil-like stems and vibrant green color, this sticks-on-fire cactus can truly be a showstopper. However, it's important to remember that the pencil cactus is not a true cactus but rather a succulent. It requires minimal care, preferring bright light and well-draining soil. By providing proper pencil cactus care, you'll have a beautiful and unique Euphorbia firestick plant that will thrive for years to come. 

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Jon
Cuba, US
★★★★★ 3
Good chair with some quality issues
Color: Black, Size: Pack of 1
I've been using this chair for 12+ hours a day for the last 5 or 6 months and so far it is much better than my last chair I bought at Staples with a few problems. First, overall the chair is still comfortable when set properly, the cushion on the bottom is a little worn out but is still comfortable and I find the backrest comfortable except for the lumbar support which has very little cushioning and feels like a plastic brick being pushed into my back, however I find that I can keep it mostly out of the way most of the time and it isn't noticeable when I carry most of my weight on my upper back area while reclining. The reclining angle is super comfortable and the mesh on the back is not noticeably worn out. I like the headrest which is made of a cushioned mesh, its not better than a pillow but it's very comfortable to be able to rest your head in a chair you are going to sit in for long hours and gives good support. The arm rests don't feel amazing, they have a very stiff plasticky cushion feeling that I'm not much a fan of in terms of pure comfort but they get the job done as I mostly only rest my elbows on them when typing. The arm rest adjustment has a pretty good height range and I keep them at the highest settings and set as close to the chair as possible. While the chair may be comfortable, I have had some quality issues that bring down my opinion of the chair. First, my right arm rest does not go as high as my left arm rest and I have to set the left one down two positions to match the right one Second, the back rest locking for the upright position is broken but I can rarely get it to work as long as I don't put much weight on the back. I would imagine that most people would want to lock the chair upright as opposed to the other positions. Third, the 3 screws holding in the backrest untighten themselves over time, causing the backrest to move to its furthest back position and rock left or right if I lean on either side. When I tighten them again they will usually last about 1-2 weeks before becoming mostly loose again. There is no danger of the screws completely falling out though, just losing their tightness Lastly, I'm not sure how stable or secure the wood panel at the bottom of the seat that everything attaches to is strong enough, I used to have my armrests adjusted out further from the center but when I would lift up on my arms to adjust my seating position I would occasionally hear a sound of the wood stressing under the torque from the armrests. since I moved both armrests as close to the center as I can this has not happened; I would like them a little bit wider but I don't want to risk breaking the chair over it. Also, one of the factory-installed screws in the bottom seat panel fell out and wont stay back in but I haven't noticed any problems other than the risk of stepping on a screw caused by it While this is likely the most comfortable chair I've ever sat in, I have to give it 3 stars for the uncomfortable lumbar support and the quality control issues. If the QC issues were fixed I could easily give this chair a 4 star review
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Reviewed in the United States on March 20, 2022
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Wes B.
Massapequa, US
★★★★★ 5
Fantastic!
Color: Light Grey, Size: Pack of 1, Color: Light Grey, Size: Pack of 1
Outstanding quality and incredibly easy to assemble! The back support is a perfect 10/10. I was debating between the M57 and the B100, and the B100 definitely won me over. The materials feel premium and durable. Highly recommended!
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Reviewed in the United States on June 4, 2026
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Dre
Boise, US
★★★★★ 5
Comfortable. Great Value for money. Easy to assemble. Great customer service.
Color: Black, Size: Pack of 1, Color: Black, Size: Pack of 1
I've been looking for a new chair to replace a cheap $30 chair i bought off of Amazon last year that had been killing my back and shoulders. I wanted something in the $150-$200 range and settled on the M18. Shipping was a fast 3 days with Prime and the box arrived in great condition. All parts were separately wrapped or in their own boxes. Came with all hardware and nothing was missing. Assembly took me a little longer then normal because i have rotator cuff injury in my left shoulder so that arm is mostly useless. The most difficult part for me was attaching the wheels to the base. Other then that it was simple. Once the chair was assembled i sat in it for the first time and started making my adjustments with the recline feature, armrest level along with the headrest. Next i reached around for the lumbar support knob and tried to adjust it but with my bad shoulder i decided to just get out of the seat and turn it around and adjust it with both hands. After spinning the chair a round to get at the lumbar knob i noticed a large crack in the plastic in the middle of the back of the lumbar plastic piece. I had not made any lumbar adjustments yet so i assumed this is how i received it. The lumbar support comes preinstalled to the backrest so it either was damaged before or during the shipping process. Either way it was damaged before being delivered to me. The lumbar support still functioned properly but it was still broken. I decided to contact Sihoo's customer support that came along with the installation instructions regarding the damaged lumbar piece. I received a reply the next day and after sending them some more info about my order and a couple pics they shipped me a replacement part which took a week to arrive. I swapped out the damaged part and after owning the chair for a week so far i am really happy with my purchase. Im about 5'10 180lbs. At its highest height level my feet reach the ground comfortably flat footed. The backrest fully covers my back and the headrest adjusts very well to sit on the back of my lower head/upper neck. The armrests only go up and down....not forward and back or tilt inwards. This is fine for me as they are grooved to fit your forearm while sitting at your desk/keyboard. The armrests are also a soft cushioned rubber material...not a hard plastic. The mesh of the backrest and headrest are good material and seem well made. The seat is very wide and the cushioning is firm which i prefer. Usually more firm cushioning seems to last longer and hold its form. The base of the chair is VERY sturdy and made of all metal. My chair is on carpet and holds its position very well. As far as recline goes you can set it to recline all the way back, half way or lock the chair in the upright position. You can also adjust the resistance on the reclining feature. So that being said im very happy with my purchase. It arrived with a slight flaw which the company corrected in a fast manor and was very polite in their customer support. I personally don't have a lot of experience with many office chairs and have never used a high end chair($500-$1000+) chair before to make any comparisons. All my chairs for the most part have been from local stores like Staples or Office Depot. Id recommend this over anything they carry in this price range....and i went and looked at their products before buying this chair as well.
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Reviewed in the United States on September 1, 2023
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Hamza Yahya
Phoenix, US
★★★★★ 5
SIHOO M18 chair is amazing
Color: Black, Size: Pack of 1
I purchased the SIHOO M18 Ergonomic Chair a few years ago and have really enjoyed it. It’s very comfortable and offers multiple adjustments, whether you want to recline and relax or sit upright for work. The back support is also excellent, and I haven’t had any issues with the chair at all. You can easily tell it’s high quality from the build and appearance—no creaks or noises whatsoever. I highly recommend this chair to anyone in the market for a new office chair.
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Reviewed in the United States on June 12, 2026
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Megan R Wesby
Fort Morgan, US
★★★★★ 4
Good budget-friendly option
Color: Black, Size: Pack of 1, Color: Black, Size: Pack of 1
The chair arrived 4 days early and was easy to put together by following the instructions carefully. It feels sturdy and comfortable. It does support the lumbar region of the back and the arm rests are adjustable vertically as well as the head rest. I wish the arm rests were able to rotate in and out for added customization and that the back of the chair could be adjusted up and down for more precise support. But for a budget chair, it does a good job.
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Reviewed in the United States on June 4, 2026

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