7 Poisonous Cacti Varieties You Should Be Aware Of

Are cacti poisonous? It’s a good question, and one that has been asked for years. Cacti are not typically known to be poisonous, but there are some exceptions. So if you’re ever in the desert and come across a prickly plant-like thing – is it safe to say hello? Probably not!

are cacti poisonous

Are Cacti Poisonous to Pets?

If you have pets at home and are wondering whether cacti are poisonous, the general answer is no. However, some cactus needles can cause irritation in pets and may lead to an allergic reaction if they come into contact with them often enough or ingest any of their parts (either by chewing on a needle that has fallen off from one plant onto another nearby).

If you have dogs at home who like digging up plants around your yard – be careful! They might end getting pricked themselves when trying to get rid of those pesky weeds…or worse yet: eat some prickly pear fruit which could make for quite unpleasant consequences later down the line such as vomiting blood due to its toxicity levels being so high it’s lethal even after just eating two pieces.

Are Cacti Poisonous to Humans?

Cacti are not poisonous to humans. The only time cacti are dangerous is if you eat them, which can cause stomachaches and diarrhea. Some people may have allergic reactions to the needles on cacti, so it’s best to avoid touching or eating them.

Is There Poison in Cactus Spines?

Cactus spines are modified leaves that can be found on most cacti. They are typically found on the outer edges of a cactus, and they can be either sharp or soft. The spines help protect it from predators by inflicting pain when touched. There are many different types of cactus spines, including glochids and bristles.

are cactus spines poisonous

Glochids (pronounced GLAW-kid) look like tiny hairs that cover many types of plants in dry climates including prickly pear pads as well other desert flora; these glochids will cause irritation if you touch them with your skin because their barbs hook onto flesh so tightly to remove themselves easily without tearing off any tissue along.

Bristles are similar to glochids, but they are not as sharp and will cause less irritation.

There is a common misconception that cacti spines can be poisonous because of the needles on some types like saguaro or hedgehog varieties; however, this isn’t true for most other species including barrel-shaped ones such as prickly pear pads which have soft bristles instead!

Even though the spines have no venom or toxins in them, it’s still important to be careful when handling cacti because they do cause skin irritations.

What Do You Do If You Get Pricked by a Cactus?

If you get pricked by a cactus, it’s important to wash the area with soap and water as soon as possible. If there is any debris on your skin or if dirt has gotten into an open wound from being pierced then clean that out too!

You should also apply an antibiotic ointment for protection against infection because of all those tiny barbs which can easily tear off bits along their way inwards towards fleshy tissue.

Read more on how to remove cactus needles embedded in skin.

List of Poisonous Cacti

There are a few cactus species that are indeed poisonous. These include the following:

The San Pedro Cactus

The San Pedro Cactus is a type of cactus that grows in the wild and can be found in Mexico, Central America, and South America. It’s a type of cactus that is used in the production and distribution of cocaine.

san pedro cactus

The San Pedro Cacti are poisonous because they contain mescaline, which can cause hallucinations or delusions if ingested by humans; it also causes nausea when consumed orally with alcohol so be careful!

The Peruvian Torch (Echinopsis Peruviana) Cactus

The Peruvian Torch (Echinopsis Peruviana) Cactus is a type of cactus that is found in the wild and can be located throughout South America.

peruvian torch cactus

The Peruvian Torch Cacti are poisonous because they contain alkaloids, which cause nausea when ingested orally; it also causes hallucinations or delusions if consumed by humans so again: BE CAREFUL!

The Prickly Pear

The Prickly Pear has spines on its pads as well but these do not have any toxins like those found inside other types to make them more dangerous than others – this plant only contains latex sap from their stems (which will irritate your skin).

prickly pear cactus

It does however produce an edible fruit called prickly pear fruits that are used in making jams and jellies.

Peyote Cactus (Lophophora Williamsii)

The Peyote Cactus is a type of cactus that is used in Native American rituals and ceremonies. It is also known as the “flesh of God” because it contains a hallucinogenic drug called mescaline, which can cause hallucinations or delusions when consumed by humans so again: BE CAREFUL!

peyote cactus

The Barrel Cactus

The Barrel Cactus contains toxic sap that is found in the plant’s ribs and can cause skin irritation. It also has sharp needles on its pads for protection from predators but these do not contain any toxins like those mentioned before – only latex-like juice (which will irritate your hands).

barrel cactus 1

The Cholla Cactus

The Cholla Cactus is a cactus that shoots needles. It contains some of these same toxins as those mentioned before but it does not have any latex-like juice like the Barrel Cacti do – only its spikes are poisonous to humans (and animals).

cholla cactus 1

This type will grow all over North America from Canada down into Mexico where they thrive best at elevations between 2000 feet up until 7000 ft above sea level with temperatures ranging anywhere from 20 degrees Fahrenheit (-12 Celsius) during winter months or 100 F (+38C), depending upon your location within this range.

The Saguaro Cactus

The Saguaro Cactus is not poisonous but it does have a lot of sharp, pointy spines that can cause some discomfort to humans and animals.

saguaro cactus

It has been said by many people who live in the desert regions where these cacti grow best (Arizona) – they are considered as one type which will provide you with shade.

The Poisonous Cactus Look-Alikes: Euphorbias

Euphorbias are a type of succulent that looks like cactus but are not. The sap of some euphorbia plants contains cycasin, which is a chemical that can cause vomiting and diarrhea.

euphorbia lactea 1
Euphorbia lactea

If you have an allergy or sensitivity to latex, you may experience symptoms of an allergic reaction from handling this plant.

Can Cactus Needles Kill You?

Cactus needles can be dangerous because they are sharp and have a lot of surface area. They can cause skin infections, puncture wounds, and other injuries. The needles contain chemicals that may irritate the eyes or skin.

If you are allergic to the plant or have an open wound, it will be very easy for you to get infected by the bacteria from the plant’s needles. If this happens to you, contact your doctor immediately.

What is the Most Dangerous Cactus?

The most dangerous cactus is the Saguaro, which can grow up to 50 feet tall. It’s found in Arizona and California. Its needles are long and sharp, so it’s important to wear gloves when handling them. These needles have toxic sap that can cause severe skin irritation if it gets into your eyes or mouth.

Is Cactus Water Poisonous?

Yes, cactus water is poisonous to humans. It contains a substance called saponin which can cause vomiting and diarrhea. The effects of drinking the water are usually not serious but it’s best to avoid it if you’re pregnant or have an underlying health condition.


In conclusion, cacti are not poisonous in general, but some are. It’s best to avoid cactus water if you’re pregnant or have an underlying health condition and wear gloves when handling them.