Member of the family Cactaceae. Desert succulents.

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8
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1answer
50 views

What is this epiphytic cactus with small orange flowers along the stems?

Does anyone know the species of this epiphytic cactus? Even the genus would be a step forward. Could it be a Disocactus sp.? The open flower is less than 2 cm (just under an inch) in diameter. The ...
4
votes
1answer
43 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 ...
5
votes
0answers
33 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 bring them outside as the weather starts to warm up. They are potted in a mix of coconut fiber, sand, fast ...
5
votes
1answer
125 views

White spots at the base of a cactus

Somebody gave me this cactus and I noticed that the base is getting white. Is it normal? Other information: I live in Canada The cactus is indoor and facing the sun all day I used soil for cactus ...
4
votes
1answer
225 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 ...
7
votes
1answer
70 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 ...
8
votes
3answers
646 views

What cacti can grow without cold protection in USDA zone 6b in Pennsylvania?

I'm in USDA hardiness zone 6b. I'm growing eastern prickly pears as outdoor perennials, and would like to grow some other cacti as well. From what I gather, cold hardiness has a lot to do with soil ...
7
votes
2answers
72 views

How can I determine if cactus seedlings are dead?

I planted some notocactus seeds sometime in September and many have germinated since then. A few weeks ago, there was an incident where some of my succulents may have experienced frost and I can't be ...
7
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3answers
81 views

Does anyone know what type of cactus this is?

Hi all, I recently bought this cactus but haven't had much luck identifying it. Any help or ideas would be very much appreciated. Thanks :)
7
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1answer
115 views

How to salvage a cactus plant that is half dead

This plant did very well for a year and bloomed. At some point I think I over watered it and it started looking 'dusty' and then parts turned black. I snipped off the worst parts and let it dry out ...
4
votes
1answer
48 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 ...
3
votes
3answers
127 views

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 ...
4
votes
1answer
59 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.
3
votes
0answers
61 views

Why has my prickly pear cactus gone limp? [duplicate]

I have a new prickly pear that I love and it just went limp on me tonight. I checked the soil and it feels moist but not wet and top inch is bone dry. Around the roots is a little damper. The top ...
3
votes
1answer
83 views

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
3
votes
3answers
289 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 ...
9
votes
2answers
3k 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 ...
2
votes
1answer
89 views

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.
2
votes
1answer
160 views

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

I received my cactus as a gift approximately 10 years ago. I have never known what species of cactus it is and I thought it is time to figure it out. I am unfamiliar with cactus and I don't know if ...
2
votes
1answer
158 views

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. ...
5
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0answers
44 views

Repotting a cactus after flowering but before fruits

It is generally advised against repotting a cactus while it has buds or flowers on it. My Mammillaria prolifera has just finished flowering and it really needs repotting. But since it's a self-fertile ...
3
votes
2answers
196 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 ...
1
vote
1answer
251 views

What is the legality of growing San Pedro cacti in Florida? [closed]

Clusters of columnar cacti like the San Pedro (Echinopsis pachanoi) are very appealing to me. I want to grow it all around my house. I am aware however that this is considered to be a hallucinogenic ...
8
votes
2answers
154 views

What is this cactus with paper-looking spindles sticking out all around?

I bought this cactus a while ago and never knew the name of the species. Can someone help me with the name of the plant? A small clone of it is growing on the top of the plant. Should I cut it and ...
5
votes
4answers
1k 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
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2answers
165 views

How do I divide an overgrown Mammillaria cactus?

How do I divide an overgrown cactus (looks similar to Mammillaria vetula subsp. gracilis Preiff)?
3
votes
2answers
223 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
117 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 ...
4
votes
1answer
142 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 ...
4
votes
1answer
102 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?
4
votes
2answers
75 views

How can I prevent 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 ...
7
votes
1answer
1k views

Why Hasn't my Cactus Grown Deadly Spines?

I recently purchased a small cactus plant from my local store for about $5. I've been giving the cactus lots of sunlight and a good watering every week. I've noticed that since I bought it, the ...
4
votes
2answers
76 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 ...
6
votes
1answer
320 views

What is this cactus with flat pads and spines growing in small patches?

I was given a cutting of a friend's cactus. It is growing in his front yard but he does not know much about it. His cacti are green and segmented some with red bulbs on top. I believe the red bulbs ...
3
votes
1answer
133 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?
4
votes
1answer
222 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 ...
4
votes
1answer
667 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 ...
2
votes
2answers
197 views

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 ...
2
votes
1answer
106 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 ...
3
votes
2answers
226 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 ...
7
votes
1answer
3k 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 ...
5
votes
1answer
174 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
55 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 ...
6
votes
1answer
1k views

What are these brown patches on my acanthocereus tetragonus (fairy castle cactus)?

I've had this pair of fairy castle cacti for several years now, and they've done fairly well. However, I noticed today that they have developed brown patches over most of their stems and a few areas ...
3
votes
1answer
154 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 ...
9
votes
2answers
277 views

What's a good water system for my cactus plant during holidays?

I have a very resilient cactus that can be left alone for a month without consequences. Now, I want to leave it alone during two months and leave it some water system. I have seen little earthen ...
4
votes
1answer
90 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 ...
3
votes
1answer
205 views

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. ...
12
votes
2answers
2k 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 ...
2
votes
2answers
101 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 ...