Questions tagged [cactus]

Member of the family Cactaceae. Desert succulents.

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9
votes
2answers
21k views

Why is my cactus droopy?

I have a cactus (pictured) which I bought about a month or so ago. It has been slowly drooping, although the tag said to keep it dry in winter and I have only watered it once when I re-potted it. The ...
4
votes
1answer
2k 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 ...
15
votes
2answers
4k views

How should I repot these overgrown and delicate plants?

I've got several plants that are probably overdue to be repotted. One of them is a cactus with lots of new growth and sharp spines. And the other is a jade where many more of the cuttings survived ...
14
votes
4answers
392 views

How to manipulate a cactus with thick long spines?

I'm thinking of buying a cactus. Shops have a lot of those and one of the variables is the size and density of spines. Cacti with rare huge spines (something like 15 millimeters long and about 1 ...
6
votes
1answer
178 views

How should I cut a long, curvy cactus?

I have received a cactus that is a bit curvy. Here's some pictures to give you an idea: It's doing well right now but I'm concerned that the curve will eventually break it. Is it possible to cut this ...
7
votes
1answer
833 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 ...
12
votes
1answer
3k views

What is this white growth on my cactus?

I have several cacti growing in my yard and one (t. pachanoi, if it matters) has developed a white layer across the top of the plant. It is very fine and looks almost sandy, like perhaps a mould or ...
10
votes
2answers
13k views

Why is my cactus purple?

This has been going on for a while (about a year), one of my cacti has turned purple. I've just replanted it after its pot fell and broke (no, it did not spend the year on the ground). What is the ...
10
votes
1answer
725 views

Do opuntia (prickly pear) cacti readily form hybrids in the wild?

I suspect the answer is yes, because they are the most diverse group of cacti. The reason I ask is that we actually have four varieties/species and I'm having a lot of trouble identifying them! The ...
8
votes
2answers
326 views

cultivating a cactus from cutting

I've recently gotten a san pedro (Echinopsis pachanoi) cutting as a gift. I'm trying to take care of it as good as possible, but I'm not sure if I'm doing it the right way. The situation is: the ...
7
votes
1answer
2k views

What is this white crust forming on my cactus during the growing months?

I live in the UK and have a Trichocereus bridgesii/Echinopsis lageniformis "monstrose" cactus that I bought from a garden centre 3 years ago. Every year in early summer several new stems grow from ...
7
votes
2answers
173 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 ...
6
votes
1answer
660 views

How do I safely eradicate mold without hurting cactus seedlings?

Here are some of my seedlings, sown a little bit less than a month ago. As you can see, there's mold starting to form. I am using the baggie method whereby the pot with the seeds is enclosed in a ...
5
votes
1answer
154 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 ...
4
votes
2answers
375 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'...
3
votes
2answers
527 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 ...
3
votes
2answers
138 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 ...
1
vote
2answers
216 views

Small cactus from garden center identification

I bought a small cactus from the garden center, but it doesn't say which species it is. Can anyone identify this cactus? For reference I put it next to a coin of about 3 cm (1.2 inch) in diameter. ...