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
2
votes
2answers
134 views

Help identifying a cactus

I got this cactus as a gift. Can somebody please identify what it is? Thank you.
2
votes
1answer
806 views

What is wrong with my cactus?

I'm hoping someone can help me but I'm afraid it's too late. I've had a cactus for about 3 years and he suddenly started losing color, turning brown, and getting a little droopy (see pictures) a few ...
2
votes
1answer
62 views

Soil condition for catus seedling

I have a cactus seedling (Pachycereus pringlei), it is one month old now (germinated end of August). During this time I kept the soil very moist and wet. My question is when do I switch to normal ...
1
vote
2answers
4k views

Cactus spines turning yellow?

I'm a first time cactus owner. My flatmate is watering it while I'm out on long holiday, and she sent me a picture showing that the spines are yellowing. I've read this can be a sign of old age, but ...
8
votes
2answers
2k views

What fertilizer should I use on agave and cactus?

I live in Canada, and have several cacti and large agave plants. It's soon going to be time to take them outside as the weather starts to warm up. They are potted in a mix of coir, sand, fast draining ...
3
votes
4answers
2k views

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 ...
4
votes
2answers
818 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 ...
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 ...
4
votes
1answer
52 views

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 ...
6
votes
1answer
2k views

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 ...
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
0answers
626 views

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 ...
5
votes
2answers
402 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?
3
votes
1answer
89 views

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 ...
2
votes
1answer
231 views

Succulent turning yellow

My plant is suddenly turning yellow and I don't know what it wrong with it or if it is normal. I have it for about 4 month and this happened only this week. I don't know if it's related, but it has ...
2
votes
1answer
598 views

What's wrong with this cactus?

I have this cactus that is slightly wrinkly and soft at the bottom part. It sits on a window sill with all my other plants and receives around 5-7 hrs of direct sunlight every day. I water it once a ...
2
votes
1answer
369 views

Pilosocereus cacti, growed from seeds and a lot of mistakes

I made a terrible (i hope not that terrible) mistake when growing Pilosocereus pachycladus cacti from seed, i sowed them back in November. I know it's probably not the best idea to sow them right ...
3
votes
3answers
615 views

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 ...
3
votes
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 ...
1
vote
1answer
50 views

Is my cactus okey?

This is my first time posting thing here n honestly the only reason I'm signing up on this website is to find out on what the hek is wrong with my cactus. So please??? I had been searching on Google ...
6
votes
2answers
994 views

What is this succulent with flat hairy leaves?

This succulent is about 1.5 feet tall. The leaves are flat with a white hairy type substance. What is it called?
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. ...
4
votes
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 ...
6
votes
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 ...
1
vote
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
votes
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 ...
4
votes
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?
3
votes
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 ...
3
votes
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?
7
votes
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 ...
7
votes
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!
3
votes
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 ...
6
votes
1answer
4k views

Can we root prickly pear pads that are sold in grocery stores as a vegetable?

Can I root prickly pear pads that I buy (presumably for food) in the grocery store? It seems like it would be a great way to get some thornless prickly pear cacti growing. If I were to do it, I would ...
7
votes
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-...
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 ...
4
votes
3answers
766 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 ...
3
votes
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 ...
8
votes
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 ...
7
votes
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 ...
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

What is the bright green spike on the cactus?

What is this bright green spike on my cactus?
3
votes
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.
4
votes
1answer
216 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 ...
7
votes
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 ...
4
votes
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 ...
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 ...
7
votes
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 ...
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 ...
3
votes
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 ...
3
votes
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 ...