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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2answers
487 views

Cacti red/white discoloration

I’m growing these cacti for about 9months i just changed their soil and pot, while i was picking up the little babies is realised that some of them changed color to red (meaning too much sun i guess) ...
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1answer
332 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
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Problems with fairy castles cactus

My beloved fairy castles cactus has been suffering for a while and I was wondering what could be happening now. It looks like having several different problems... specially worried as it looks ...
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2answers
438 views

Cactus with a white "growth"

(There are a few other questions which may be related but I am not sure if this is a duplicate. (What is this white crust forming on my cactus during the growing months? , What is this white growth on ...
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2answers
140 views

What's this cactus with tongue like leaves?

Saw this cactus while I was walking along the road in Whangarei which has a subtropical climate. It is growing over the fence into public air space so it would be legal for to take a cutting. And I ...
3
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2answers
950 views

Cactus turning white/brown/yellow

I believe this cactus is a cereus jamacaru but I am not 100% sure. I had it in relatively low light room but across from a south facing window in the sunniest spot of the room. I watered it once ...
7
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2answers
10k views

White and brown spots on cacti

I've been away for the last two and a half weeks, and upon return I noticed a few of my cacti had developed white fuzzy spots, which were not there before. In the worst instance, one cactus appears ...
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2answers
153 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?
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1answer
1k views

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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0answers
863 views

What is wrong with my cactus? (Red spots)

Is it dying? There are these weird red marks, is this a fungal infection or sunburn?
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3answers
103 views

When is the winter period for plants kept in a country with no winter (or a constant room temperature)?

Reading up on how to care for a Mammillaria Elongata Cactus I see it mentions such things as suspending watering in winter for best care (and to encourage better flowering) the preferred time to re-...
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1answer
694 views

Help is my cactus is dying, can it be saved

I recently bought a golden barrel cactus (about two months ago), judging by its size I would say the plant is about a year old. Everything has been perfect with it until Saturday. I usually water or ...
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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 ...
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1answer
198 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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1answer
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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 ...
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4answers
414 views

Identity and give care instructions for mammillaria cactus

Hi, I think I just bought a mammillaria cactus. What is the subspecies and how do I care for it best? What colour flowers to expect? What should I do with the fruits sticking out (propagation ...
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2answers
3k views

Are these 'fluffy' cacti healthy?

My wife and I have had these cacti for a little over a year now. Since change happens slowly I assume we never really noticed, but now it seems like it has gotten a lot more..fluffy.. for lack of a ...
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4answers
3k views

Succulent Disease Identification (kalanchoe beharensis)

Album of pictures Another album of updated pictures One leaf before being "washed" with a mild soap/water mixture Another leaf after being "washed" with a mild soap/water mixture I purchased this ...
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3answers
655 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 ...
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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 ...
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0answers
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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 ...
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2answers
1k views

What is the bright green spike on the cactus?

What is this bright green spike on my cactus?
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2answers
836 views

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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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 ...
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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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1answer
465 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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1answer
48 views

Can I make my own potting soil with what I have?

I have miracle grow gardening soil as well as Hoffman and Espoma cactus mixes. Can I mix these two (part cactus mix part gardening mix) together for potting geraniums and lobelia? I'm out of general ...
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3answers
5k views

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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2answers
2k views

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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1answer
3k 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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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 ...
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1answer
1k views

Orange and White thing in my new house plant soil

I got these new plants from Walmart just a week ago ( Monday ) and I did some research saying to water them once a week so I waited until Wednesday to water them. The research told me to water until ...
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1answer
4k views

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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1answer
103 views

Is My Cactus Doing Well?

My wife and I are a bit concerned with the appearance changes of our cactus. The plant was always growing fast, however the spring accelerated the growth even more. Some time ago we noticed the ...
3
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1answer
330 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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0answers
78 views

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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4answers
22k 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 ...
7
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1answer
1k views

The age of an Opuntia (prickly pear cactus)

Opuntia, prickly pear cactus, is a hardy plant with a wide range of distribution. Its growth habit is by branching paddles, or nopales. Is there any way to measure or estimate the age of such a ...
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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: ...
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1answer
3k views

What type of soil do cacti prefer? (acidic or alkaline)

I have done some research and found some sites suggesting alkaline soil while others say that alkaline soil will inhibit the growth of a cactus.
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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 ...
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1answer
1k 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, ...
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1answer
274 views

What is this columnar cactus?

I am trying to identify my cactus that I planted when I xeriscaped last year. I never saved the little stick thing. I thought it was just a saguaro variation, but then it popped out all these red ...
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2answers
884 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 ...
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1answer
1k views

What are these white/yellowish spots on my mexican fence post cactus?

My mexican fence post cactus has developed some sort of white/yellowish fungus(?) on it. Anyone know what it is? I hope it's not a goner!!! Looking for some help to save this guy!
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2answers
245 views

Centering Opuntia Cactus

I originally cut some Opuntia pads I got from a seller into half and planted them in the centre of pots. Unfortunately, they seem to be growing on one side only and I fear they will get too heavy and ...
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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 ...
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1answer
1k views

Why is my cactus turning purple and pale?

Ever since I got this cactus it has been growing, but now it's becoming purple and paler. What am I doing wrong, and how do I solve it? I'm rather new at this gardening stuff so help would really be ...
7
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2answers
2k views

Should I cut off cactus pads to help the main branch to grow?

I have some small cactus (one year old) and they are have been producing a lot of new pads. If I remove the branching pads, the main stem will have more energy to develop itself (my main focus is to ...
5
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1answer
110 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?