Questions tagged [cactus]

Member of the family Cactaceae. Desert succulents, but for non-cacti succulents use the [succulents] tag. Use this tag with questions about caring, propagating and identifying cactus.

Filter by
Sorted by
Tagged with
5
votes
4answers
23k views

How to fix a broken cactus

I have been growing this guy for 6 years. He's gotten a little too top heavy and today has fallen over and the top piece (about 9") broke off. The break was very even. I have no idea where to begin ...
5
votes
3answers
5k views

Why is my cactus so thin?

About one year ago, I purchased three cacti in the same pot. They looked like this when I got them: One of them got bigger over the months, but the tallest one kept thinning. As you can see from the ...
5
votes
2answers
701 views

Will prickly pear thrive under the eaves on the west side of my house?

The front of my house faces due west, with about a 2' overhang underneath the eaves. There is a 12' section between the northwest corner and the walkway leading to my door that has proven very ...
5
votes
3answers
128 views

What kind of cactus is this?

I just bought this plant but I am now realizing that I have no idea what it is, so looking up care tips is much more difficult than anticipated. Would you be able to help me identify it?
5
votes
1answer
6k views

Why are leaves falling off of my Prickly Pear cactus?

I just moved into a new home in Phoenix, AZ, and now have a lot of cacti to tend to. I do not know their care history, or how much/how often they are watered. One of the largest Prickly Pear cacti ...
5
votes
1answer
4k views

Big cactus identification and how long does it take?

I found these huge cacti in a garden-center, the two on the right. The largest in the back was over 1.5 m in length! They were a little bit too expensive, so I thought maybe start from seed... What ...
5
votes
1answer
80 views

How does one go about growing a cactus in a terrarium?

I've been searching the web online, and the ideas are all conflicting. Some websites would say cacti are unable to grow in glass jars because the heat trapped will cook the cactus, and other websites ...
5
votes
1answer
579 views

identify the type of cactus

My friend showed me this picture of a cactus and we would like to buy one. The problem is we don't know the name. Does anybody recognize it? Does it produce flowers?
5
votes
2answers
392 views

Can I heal a 4 foot tall cactus after two arms were cut off?

A thief in the night cleanly amputated two arms off my 4 ft (1.2 m) tall cactus. What do I do?
5
votes
2answers
4k views

Cactus growing white hard coating

One of my cactuses has been gradually growing a white coating, and the lower outgrowths seem to be shrivelling up and fading, I first noticed this about a year ago and it hasn't stopped no matter what ...
5
votes
1answer
168 views

Is this a typical growth habit for a cactus?

I was re-potting my 9+ year old cactus to a bigger pot yesterday and noticed a sizable portion of its stem is submerged. Is this a typical growth habit? What are the chances that this stem might rot ...
5
votes
2answers
3k views

Why does my cactus have a weird white coating? What type of disease is it?

My cactus used to have white little rod like insects on it, and when I put some insecticide (added by liquid to the soil around it), the insects disappeared and it grew this weird coating, as shown in ...
5
votes
2answers
431 views

What is this cactus with smooth round spineless stems?

Does anyone know the name of this plant? I have been searching everywhere for its name, but failed terribly.
5
votes
1answer
178 views

What are these growths on my winter hardy Opuntia?

I received some winter hardy prickly pear pads from a friend last fall. They rooted well, survived the winter well (better than many other plants around here), and are putting out new growth. On the ...
5
votes
3answers
2k views

Cactus in hydroponics: Keep water levels up at all times?

I've read a bit online about growing cacti in hydroponics, and basically every site I found agrees that it's possible, and it should basically work like any other hydroponics: Set the plant (in an ...
5
votes
2answers
2k views

Is this white cottony stuff on my cactus normal?

This cactus was taken from my dad’s cactus garden before it was destroyed. It is very important that I keep it alive. I’m wondering if all this white cottony stuff on the top and the spikes is normal. ...
5
votes
4answers
21k views

What are these brown spots on my cactus?

My cactus has this brown areas growing across the surface since a week ago. If you try to remove them, they are like a hard skin that comes off, the surface underneath is normal green color but ...
5
votes
1answer
536 views

What's this cactus with large red and white spines?

I just got this cactus with large red and white spines and I'd like to know its species. It looks like a ferocactus emoryi except the spines are not hooked. But it could be something else as there are ...
5
votes
1answer
298 views

What should I look for when selecting lights for indoor cacti?

We grow cacti indoors due to the weather (UK). What should we look for when selecting lights? We have had mixed results with a new lighting system and have started to lose some. See one of the old ...
5
votes
1answer
109 views

Black material eating away at cactus

I'm not sure what kind of cactus I have, but there seems to be some sort of black material on the side of it. What is it and what can I do to remedy it?
5
votes
1answer
8k views

Cactus and Succulent in the same pot

I am looking to plant several cacti and succulents together in a single pot. Several of the plants will include a grafted "moon" cactus and a succulent "Eceveria Mazarine" there may be one or two ...
5
votes
1answer
2k views

Why has my cactus has turned red/ beige at its base?

One of my cactus turned red at its base about a year ago and it has since spread upwards. Some websites say it is a natural ageing process but I doubt so because it is still so small! Now another of ...
5
votes
1answer
90 views

Identifying plant species (cactus)

I would be grateful if someone could help me with identifying this cacti I bought. I did some research and concluded it could be Pilosocereus chrysostele. But I am not really sure as there are some ...
5
votes
1answer
220 views

35+ year old cactus turning yellow

Hello fellow plant lovers! I've adopted this beautiful 35+ year old cactus from a friend moving across the country, however I'm concerned with the yellowing you see here in the pictures. The ...
5
votes
0answers
2k views

Can my lemons grow in cactus soil mix

I bought cactus soil mix the other day from Calloway's for some plants. I then decided to grow lemons. So I did the whole deal. 2 weeks later I have lemon sprouts. I was wondering if I could use ...
4
votes
4answers
3k views

How to save this blue cactus?

I am unaware of what type it is, I bought it at Wal*Mart, so I was rather suspicious that it had been improperly stored, but I don't know. The base seems very rotted, which I think means that I need ...
4
votes
2answers
188 views

When and how to repot this cactus?

I found this cactus in a store, it was labeled as "cactus" but I think it is one of the giant cacti (see my previous question). It is about 12 cm in height (without spines). I was wondering when is ...
4
votes
2answers
3k views

How long can an Opuntia (prickly pear cactus) live?

Thanks to another question, we know that Opuntia can live for decades. Can they live for centuries? Rather than determining the age of a specimen, answering this positively might mean identifying one ...
4
votes
3answers
641 views

Prickly Pear Cactus is growing what looks like rot (need help)

Prickly Pear Cactus is growing what looks like rot (shown in the attached pictures) where it's getting a yellowish color in the place these things appear. Is this normal? Is it dangerous? What is ...
4
votes
2answers
480 views

Cactus with a growth

We have this cactus that I believe was supposed to be red at the top but is just dried and shrivelled but the stranger thing is the weird extra cactus growing out the top. Any ideas what it is, I don'...
4
votes
2answers
2k views

What is this cactus with flat oval pads and very short spines?

I bought this cactus yesterday. I want to know its name to research how I should take care of it. I'm in a rather cold city (Zanjan in northwestern Iran) with long winters, so I think it's better if I ...
4
votes
1answer
2k views

Are eastern prickly pear cacti pads edible?

Are eastern prickly pear (Opuntia humifusa) cacti pads as edible as the kind you find in the grocery store (Opuntia ficus-indica)? I know the fruit is edible, if everything across the Internet I've ...
4
votes
2answers
2k views

Delosperma (Ice Plant) indoors during winter

I live in Canada and it will soon be time for me to bring in my succulents and cacti. Last year I brought in two Delosperma plants and within less then a month they both died. they were both very ...
4
votes
2answers
1k views

How do I divide an overgrown Mammillaria cactus?

How do I divide an overgrown cactus (looks similar to Mammillaria vetula subsp. gracilis Preiff)?
4
votes
2answers
146 views

Help identify an insect on a cactus

I found this insect on my Echinopsis sp. It sort of looks like a tick, but what would a tick be doing on a cactus? What is it, and is it harmful?
4
votes
1answer
209 views

Identify this dead cactus - like a cleistocactus strausii, but super-dwarf?

Can anybody identify this cactus? It appears to me to be something between mammillaria elongata and cleistocactus strausii - but small, each column at most a long finger, and narrower. It died some ...
4
votes
2answers
1k views

Should I repot my mammillaria cactus?

I have this mammillaria hahniana: I'm considering repotting to another container, which is more beautiful, more stable, wider and shallower. You don't see it but there is a drainage hole. Here it is: ...
4
votes
1answer
999 views

Strange buds/growths on my cactus

When I purchased one of my cacti in mid-December (not identified yet), I noticed that it had some buds on its sides. I've never seen cactus flowers or buds, but that's what they seemed to be, ...
4
votes
3answers
760 views

Help identifying cactus/succulent and trimming

I decided to try making a terrarium with a bowl I had in the house. The plants I bought to put in it weren't labelled with what they were and in the few months since building it, one has grown like ...
4
votes
1answer
105 views

Determine the ID of this cactus

The first picture is from early spring, the second is a more recent picture. I have never seen this type of cactus before and would appreciate if some could identify it.
4
votes
2answers
165 views

How can I prevent a Schlumbergera from dropping buds?

I recently bought a Schlumbergera from a reputable garden centre. It had buds on it when I bought it. It soon flowered and within a couple of weeks the flowers have all fallen off and the remaining ...
4
votes
2answers
210 views

What are those brown / white spots on my cactus?

There are 3 of this same cactus sharing the pot. Only one of them is getting these spots. What could it be? Fungus? Sun burn? They are in my balcony, they don't get rain, and they get like 3-4 hours ...
4
votes
1answer
1k views

Repot dragon fruit in a definitive pot

I planted these cuttings two months ago and I have a lot of questions. Is it time for repotting? I have 26 liters pots. Is it enough? Can I plant more than one in the same pot? What kind of soil ...
4
votes
2answers
108 views

Cactus Identification? Are the buds real?

My friend brought me a little cactus from a plant sale. Unfortunately I don't have a clue about cacti and was wondering if someone could tell me what the little orange buds are? Are they real? I can't ...
4
votes
2answers
3k views

Various Questions About Fairy Castle Cactus

I have a few questions about my Fairy Castle Cactus. It’s barely grown since I bought it, in contrast to my other plants. I’ve read conflicting info about the amount of light it likes. I’m using the ...
4
votes
2answers
1k views

What is the bright green spike on the cactus?

What is this bright green spike on my cactus?
4
votes
2answers
869 views

Opuntia is slouching after repotting

About 24 hours ago I repotted my Opuntia (Specie ID is Subulata but pictures look a bit different than my plant). The plant is now slouching in a way akin to how it slouches when I neglect watering it ...
4
votes
1answer
67 views

Which Cleistocactus might this be?

I purchased this beauty a short time ago and have been unable to ID it as yet. Anyone know which cactus this is? Here is a photo of the top which looks like the Epostoa Lanata Top View Pic http://...
4
votes
1answer
323 views

How to ensure survival and growth of broken cactus

For a while now the top of my cactus had been dislodged from the rest of it, the dislodged area is brown and dead, but since the accident the area below it has also stopped growing. After 2 years of ...
4
votes
1answer
2k views

Why is my cactus drooping? [duplicate]

My cactus has gone all droopy and I don't know what the problem is. I've moved into a place with more light and I water it enough but I don't know what is wrong with it.