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.

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1answer
105 views

What type of cacti is this?

I would like to know what variety of cactus this is. It has grown three times its height since I bought it and although I have looked on many websites, I just cannot seem to find anything like it.
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511 views

Can a cactus be encouraged to “branch out”?

About 5 years ago I was given this cactus, in a minuscule pot and severely dehydrated. To my surprise it responded to watering and repotting really well. About 18 months ago I woke one morning to find ...
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San Pedro tipped over and broke

My San Pedro has been growing quite a lot the past 2 years, but very thin. It was windy the other day and found him tipped over. Not completely broke in half, only half way. So I tipped him back right ...
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812 views

Advice on LED light periods for cactus

I want to grow large cacti, see my previous question. So I start with small plants and to keep them growing in winter time I want to give them LED (special grow) light. I was wondering about the best ...
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Ants visiting Opuntia

My (elderly) Opuntia gets regular visits from a few ants, which apparently like to draw liquid where its cactus spines emerge. For this relationship between species, do we know whether it is a ...
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1answer
331 views

Is my cactus dying?

I bought my cactus about one year ago. I was surprised that it grew very fast and I thought it's fine. But it looked too skinny and after some search on the internet I found out it didn't get enough ...
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1answer
337 views

Is this sunburn or something else?

I've put my cacti for wintering into an unheated attic, by a window where the sun falls after 2 P.M and till dusk. Since it's negative temperature outside (so it's already winter in a sense) I didn't ...
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172 views

What is this cactus and how should I care for it?

I bought this cactus over two weeks ago. What is it's name and how should I take care of it?
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360 views

What columnar cactus species I should select as a rootstock for a Rhipsalis standard?

I want to make a standard(1) with scions from a Rhipsalis pilocarpa, or mistletoe cactus. I need a rootstock that: Is columnar Is unbranched Has good longevity (at least 20 years) Can adapt to high ...
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Why is my bristle bush learning

I cant seem to do anything with this. I tried to add a pic. It was sideways. Then it says I had to have words here. Well that removed my pic then the heading was too long. I just repotted and in did ...
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457 views

Need help saving my broken cactus

My cactus has recently broken but it is still connected on one side. I don't know what to do. Can he be saved or is he going to be lost?
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What's wrong with my fairy castle cactus?

My cactus used to be really thick and dark green but now it's so much skinnier and starting to shrivel up. Some of the arms are turning a dusty kind of brown and they're all leaning away from the stem ...
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Agave is sweating

It looks as if my agave is "sweating" a crystalline substance. The droplets are approx. 2 mm in diameter and twice as long. Is this as it should be (also the surrounding yellowish patch in the ...
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Dark spots on cactus?

My elderly relative has asked me to do a research on her cactus which has recently got these dark spots: I poked them and they are dry and hard when you touch them. There is no liquid or mush. They ...
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Cactus id: Echinopsis aurea?

I have two specimens and I am trying to positively identify them. So far, I am thinking both are varieties of Echinopsis(Lobivia) aurea. I am far from sure though. So, am I any close with my guess? ...
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Why are these succulent leaves withering instead of rooting?

I collected some leaves and put them on to sprout. Instead the leaves withered. I'd like know what happened and how I can avoid it.
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Why is my cactus getting long spindly arms

We've had this cactus along with 4 others for nearly 2 years and it's been transplanted to cactus soil and watered and kept in a warm sunny spot and now it's drooping badly. Has anybody got any advice ...
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What's happening to my cactus? Why is the base of the cactus drying?

The base of my cactus seems to be drying. I water it once a week. I bought it 3mos. ago. Just recently, I have seen some whitening at the base of the cactus. It was small at first but it grows bigger ...
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What is the white stuff on this cactus-type plant?

I have had this plant for more than 10 years now but I do not know its name. What is the name of this plant? The issue is that this plant has a lot of white areas, as shown in the pictures. These ...
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Why did the leaves on my Christmas cactus suddenly change texture and colour?

I've been growing a cloned Christmas Cactus now for a few months, and it has been doing quite well. I moved to university 4 days ago (from Swindon, England to Bristol, England) and today I notice that ...
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197 views

What species cactus is this?

I have taken a cutting from a large cactus, and it seems to propagate well. I was wondering what species it is? Does anyone know? Thank you in advance.
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Is my cactus infested with mealy bugs?

I have had this cactus for about 5 (or more) years, and have been treating it pretty shamefully due to me only recently researching how to garden and unfortunately being one of those who didn't care ...
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210 views

What purpose do joints serve on a dragon fruit (pitaya)?

I just bought a Pink Delight Dragon Fruit. I noticed that all of the cacti at the store had joints, dried flesh that tapers to small point. They seem like a weak point to me, a brittle point that can ...
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101 views

Please help to identify a cactus

I tried to identify this cactus in order to know how much water it needs. The closest I got with the identification is this, but I'm still not sure, the color is different: http://www.cactus-art.biz/...
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Cactus with brown and white spots. What is the problem?

My cactus has had this brown spot on its side for a couple weeks now and I don’t know how to fix it. I think it happened when I was away for a month and forgot to have someone care for it. The house ...
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Can I plant succulents and cactus in the same pot?

I have 3 plants, Gasteria, Haworthia and one cactus, the Euphorbia enopla. I have the appropriate soil with drainage but I was told the cactus would not do well with the others. How would I go about ...
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744 views

What are these potted plants with thin stems and leaves that look like sticks?

My mom gave me cuttings of this plant. She didn't know what it was but it seemed to do alright outside in the shade in Houston. What is it? Click on pictures for closer view.
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What is this plant with long narrow triangle leaves and prickles?

What is the name of the following plant? Is it a kind of cactus?
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Why does my repotted cactus seem to be dying?

I bought a cactus from my local big chain DIY store a few years back. It was in a tiny pot and all was well. It's really grown over the years so I decided to re-pot it. I used your everyday compost ...
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Why has my cactus yellowed and softened, and how can I help it live?

I had a cactus at work since the end of March. It is my first cactus and I don't really know if I was watering it correctly or if I missed something else, but now it's turned yellow and became softer. ...
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1answer
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What is this problem on this succulent?

I have this succulent in my indoor since last few months. I just moved it outside few days back and now they look like this. This is how I ruined this plant :( I moved it to sunlight which was all ...
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Watering huge cactus

In the question big-cactus-identification-and-how-long-does-it-take b.nota gives us a nice photo of big cactus. The second thing that struck me was how the soil level is about 0.00000001 inches from ...
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Opuntia Cactus: To cut or not to cut?

This is related to one of my old questions here: Centering Opuntia Cactus Now, my opuntia has grown much bigger as can be seen in the picture below. The base is still very narrow and the plant tends ...
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Cactus ID: Globular, multiple straight prominent ribs, spiny, somewhat wooly, fibrous root

I need help identifying one of my old neglected-so-far cacti. Unfortunately and somewhat deservedly, it has not flowered for me yet. It is the size of an apple (since I have treated it horribly, or ...
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1answer
801 views

How should I prune a cleistocactus that got too tall?

When I have a slender, columnar cactus like a Cleistocactus (pictured below), and it gets too tall, How can I prune it, to get it back to a manageable height?
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My Cactus has developed an amazing droop - Why?

This cactus is at least 40 years old
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Why is my cactus’ arms growing skinny like this?

The arms of my cactus are growing skinnier and I don’t know how to make it grow and appear like the original arm (lower part of the arm). It’s skinnier and has a lighter green color than the loser ...
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2answers
5k views

Germinating succulent seeds

First a little background, I live in Sri Lanka where the temperature is at about 30c throughout the year. The sun is also very strong for the entire year and yeah we don't have different seasons here....
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91 views

Can someone please ID this succulent

Can someone please ID the succulent seen in the image below:
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Cactus Identification: miniature branching species with reddish areolas

This is an approximately 10-year-old specimen of mine. I had a wild guess that it was a Frailea, but having looked at all the recognized species of the genus, I didn't find any that looks like it. ...
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551 views

How do I treat the survived parts of a cactus after some of it has rotten to prevent the problem spreading?

I have a cactus consisting of three "cylinders" growing from the same center point. Recently one of the cylinders started rotting rapidly and I had to remove that part. While I was doing that the ...
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141 views

Are there cacti that don't rot when overwatered?

I've got yet another cactus rotten and this was most likely causes by overwatering. I'll try to rescue it but I'll likely need a new one anyway. Are there perhaps cacti that don't rot when ...
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82 views

Please ID this cactus species

The label that was in the pot when I got it identified the genus as espostoa. Is it possible to tell what species it is? If not, does it even matter? I'm trying to figure out the name of the species ...
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108 views

Is my cactus dying? Or what is this?

So I just bought this cactus two weeks ago. First cactus or plant I’ve ever had. When I got it the plant was dry af. So I watered it a little bit and every 2 days or so I put it on the window sill ...
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1answer
2k views

Flattened/Deflated cactus, snapped cactus and white spots

I've been on holiday for 2 weeks, and today I put my cacti out into the sun for the first time in a 2 weeks. I noticed immediately that one section of one cactus had "deflated", or collapsed in on ...
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320 views

Overwatered cactus

I was careless with my cactus and was watering it extremely rarely. One day I decided I should take a proper care of it and this is the result So, the bases of the cacti shrink and turn green-yellow-...
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Is this a cactus?

I recently bought cacti seedlings. After one month they don't look like cacti. Any ideas on what this might be? Click photo for full size
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2k views

Why doesn't my night-blooming Cereus produce flowers?

I have had a night-blooming Cereus for several years and it has yet to bloom. A friend has one and it blooms no problem. This plant is indoors and keeps growing, but no blooms. What can I do to make ...
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325 views

What tools are available to deal with fallen cacti and cactus pieces?

After pruning cacti, I am left with many fallen pieces on the ground which, depending on the cactus type, have varying degrees of difficulty in picking up and disposing of. Is there a standard tool ...
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Can I revive my poor cactus?

My poor cactus was under-watered and I accidentally left it outside during the Big Southern Freeze in February. I had forgotten all about it when I was freezing my butt off in my house. I feel awful ...