A pic of the cactus in question would help;).

photo plz.

oh brother. I took a pict and then forgot to upload. Sorry!!

either eupohrbia or stenocereus pruunosus. Could narrow it down if you took a closeup of the spines or a top down photo. That, or if it bled any white substance(latex), it would probably be a euphorbia(which resemble cacti, but arent)

ok. will do. It is smooth skinned. Has never bloomed. Has not bled anything. I had to park it at a neighbor's for about 6 months due to a move and it looked better before that. It now has some bumps on it. I'll catch a pict of those as well. Thanks

Here are top and side shots. Thanks again. Side shot came in sideways but you get the picture.

top shot ok.

Looked at stenocereus pruunosus picts on line. Kinda looks like that may be it.

Yep. I needed to be sure - the color on those is usually blue-ish*(glauscent).

Very mostly green. No hues of blue. Do you know about it's water requirements? I have kept it going for 15 years so I guess I'm doing ok by it but would like to know if 1x a month is about right. I keep it in the sun on my deck - gets very hot there but I figure since it is a cactus it will like that. With that in mind should I water more or less than what I am doing. In the winter I don't water quite that much. Probably more like every 6 weeks. Thanks again.

twice a month would better,but in less quantity. Ive got mine 2 years, and its has doubled in size.

How do you care for it. Always outside? You are in Bay Area (my old home) so you can keep it outside year round. Gardening in New England a bit different. I don't give it a lot of water - say half a cup - each time. Anyway, thanks for your thoughts.

.....im dont live there... where does it say that? I ....live in europe. I only keep it outside during the summer, west window in winter.....

Has areoles and no sap. ribs arent linked.

Sorry - a name right above yours said Bay Area and I inadvertently picked it up. Well, that's what I do - out summer - actually south window winter. .. and it's not a cactus!! huh! Thanks again.

I bought this cactus from a highly respected Massachusetts nursery. It was labeled as a cactus. I disagree with the Euphorbia designation. It does not and has not ever oozed white sticky substance as they are described.

Spanish fly, euphorbias have buds between their spine/leaf bulges.

http://cactusamanecer.blogspot.com/2010/05/stenocereus-pruinosus.html

https://cactiguide.com/forum/viewtopic.php?t=20679

SpanishFly, you are either doing this on a phone,or just bad at id,Users plant's areloes have wool, center has a floury glauscent spread, and the plant was blue at a certain point of time.

Please dont be hypocrite then.

Well gee. I have had it for about 15 years and it has never flowered so don't know what to make of that except guess I am a poor "cactus" -- "Euphorbia" grower. Thanks to all for all info.

Pv, all i can tell you, there arent any popular euphorbia species looking like this. Closest is resinfera, but that one is short and clumping type(at this height, youd see a bush. On top of that, the buds i mentioned earlier are more evident, clearly lacking on your plant.

http://www.llifle.com/Encyclopedia/SUCCULENTS/Family/Euphorbiaceae/16003/Euphorbia_resinifera

Unless the other party can produce proof, and by stating species can ID the plant as an euphorbia, here is my proof(a photo of the glauscent structure and tiny areoles)Id also like to point out the thin trench between the ribs, which most collumnaer euphorbias(remotely shaped like this) lack.

http://www.llifle.com/Encyclopedia/CACTI/Family/Cactaceae/7951/Stenocereus_pruinosus

It doesn't look like a Stenocereus to me. I've got two of them. If it is, it's extremely etiolated. Also, Py's doesn't have that 'white stuff' that forms a nice pattern, and it doesn't twist. These are old photos. Please ignore the soil.

It is a cactus. Though, I don't recognize which one. It has actual spines rather than Euphorbia thorns.

Pv Picotte, don't worry so much about it not flowering, yet. I'm not sure about yours but some cacti have to grow to a very large size before they will flower.

Jeff, top down photo?

Not sure but lo and behold, I just noticed something on Charlie that I've never seen before. Could it be a flower??? At the very base of its tall self. He's been thru a rough time lately - parked at my neighbor's for too long (unavoidable) and knocked over in a huge wind gust in spite of being a very heavy pot. He is sort of top heavy so that probably contributed to it getting thrown. Thoughts??

Cactus, Wool and young red spines, like on all pachycereae members, befitting of stenocereus.

https://mattslandscape.com/detail/?plant_name=Stenocereus%20griseus

So it is a flower?

Pv

It may be helpful to google 'blooms of euphorbia' (or something similar) to get familiar with them They are very often very tiny and different than what most blooms look like. I didn't realize at first one of my euphorbs was blooming :) Just so you know what they look like. Cactus flowers are very different, and even small ones are usually quite a bit bigger than blooms of most Euphorbias.

Here is my small E obesa:

managed to find an offshoot photo.

https://scontent-ort2-2.cdninstagram.com/vp/1e7ead78446ff0bbc7d138167efa5ba8/5B62535E/t51.2885-15/s640x640/sh0.08/e35/29739072_173681883351604_3244641547798446080_n.jpg

It took effort- branches are apparently called"arms"....

Wow - so it is like a branch but in this case, called an "arm". Yes, I guess it is becoming an adult. Maybe someday a bloom? Rina - your pink flowering E.milli is lovely and your E. obesa is charming. Thanks again.

Stefan - one last question - what about fertilizing this plant? type, frequency... Thanks.

I dont really do it. If you could, use one with balanced npk factor, not too high. Repotting once every few years could also do the job.

ok great. I have repotted it twice in 15 years. Thanks.

Repot more frequently and it should grow a lot more than it has done. Also water more frequently. Water well and wait until it is totally dry before watering again. Make sure you repot into a pot with good drainage holes. Don't bother to fertilize. Use a commercial cactus soil mix rather than the soil you are currently using.

Great info. Thanks so much. I just watered and since it is outside in hot sun, I will check its dryness in a couple of weeks. Also, will transplant. Thanks very much.