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Cacti and Succulents: Soil for Cacti and Succulents...your favorite?

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Opa_In_Ga7b
La Grange, GA

November 27, 2012
6:48 PM

Post #9344235

Just starting with succulents...any reccomendations for a soil mix? Either your own mix or pre-made suggestions welcome, I know they like a dry medium but what about nutrients? Thanks!
48flash
Mesa, AZ
(Zone 9b)

November 27, 2012
9:12 PM

Post #9344376

Hi Opa
I'm not sure how many members we have on this forum but I'd bet that there are at least that many recipes for succulent potting mixes. Hopefully others will add their comments. Some use a different mix for different plants. Some mixes are an exotic combination while others are pretty basic.
All of my succulent plants are outdoors year round. I am a lazy gardener and I also tend to over water potted plants so I want a an easy, one size fits all, fast draining, soil mix. For this purpose I use a commercial cactus / succulent soil from Home Depot or Lowes and mix it 50% with pumice.
To supply some level of nutrients, I apply tomato plant food diluted 50% once a year.
Is this the best mix???? Most likely not but it has worked well for me. Others are much more refined at that magic of the correct mix so lets see what other comments we get.
Good luck as you move forward with growing succulents.
Opa_In_Ga7b
La Grange, GA

November 28, 2012
3:52 PM

Post #9344884

Thanks for the reply Flash...I had bought cactus / succulent soil from Home Depot but it seems it retains too much moisture, didn't know about the adding the pumice.

With other plants I have always just bought a good potting soil and amended with perlite and/or vermiculite but knew succulents would be different.

Baja_Costero

Baja_Costero
Baja California
Mexico
(Zone 11)

November 28, 2012
6:11 PM

Post #9345034

I think you can do the same for succulents, just add more aggregate. The main thing is that the mix drains fast. What you use depends on what's available in your area. Perlite and pumice serve some of the same functions. I use cactus mix alone or usually with added pumice, up to about 25% for most plants.

What are you growing?

If you're using clay pots then you can get away with less rock. Be aware that varying the amount of rock will affect the watering interval, as well as the need for fertilizer, so it's good to be consistent. For a given type of plant anyway. I try to set different plants up so that they will all need water at roughly the same time, for the sake of convenience, because I'm a lazy person.

These days I fertilize most plants in the sun every month or so with a 1/4 strength fertilizer (50 ppm N). They definitely don't need it but I like the results. We have a very even, mild climate. Some fast-growing plants may benefit from low-strength fertilizer at every watering. As a general rule succulents aren't particularly needy that way, so try growing them without fertilizer before you experiment. Avoid fertilizer right after repotting and when plants are dormant.
amanzed
Los Angeles, CA
(Zone 10a)

December 4, 2012
12:49 AM

Post #9349281

80% to 100% pumice, depending on how winter-sensitive the plant. Feeding required.
plantsforpeg
Ventress, LA
(Zone 8b)

December 10, 2012
6:22 PM

Post #9355119

What's the difference between pumice and vermiculite?

Baja_Costero

Baja_Costero
Baja California
Mexico
(Zone 11)

December 10, 2012
7:54 PM

Post #9355188

Pumice is volcanic glass which is full of little air pockets. Vermiculite is processed from a mineral which expands when heated. Pumice is much heavier, holds less water, and has a lower cation exchange capacity. Otherwise they perform roughly the same role in soil mixtures, though they are definitely not interchangeable.
amanzed
Los Angeles, CA
(Zone 10a)

December 10, 2012
11:15 PM

Post #9355253

Baja's right.

I'll add...vermiculite holds more water than pumice, and vermiculite breaks down relatively quickly (considering that some of our plants grow slowly). All my C & S plant idols say vermiculite is fine for tropicals (it's great for rooting houseplant cuttings). But for C & S, use pumice, scoria or perlite (depending on what you can get, price, and their differences). Perlite's lighter and cheaper (good) but it floats and creates more dust (bad), and its other growing properties are somewhat different from pumice. Perlite's air bubbles are sealed in a heating process; pumice's are permeable. Scoria (basaltic spongy lava) is heavier still and breaks down faster than pumice (granitic spongy lava). I grow okay in scoria, but some folks say it can be quite alkaline (high pH). Perlite's an okay lightener and filler, and it retains a bit more water than pumice.

Now that I've written that, it looks like it would be much clearer in a table or matrix.
granitegneiss
Norridgewock, ME
(Zone 5a)

December 11, 2012
6:07 AM

Post #9355384

In the east, pumice is not readily available. Chicken grit, which is crushed granite, is cheap and available at feed stores. Heavier than pumice, but does the job. I abhor perlite aesthetically. The container plants forum on this website has sticky links at the top to excellent discussion of drainage in potting soil by Tapla.

This message was edited Dec 12, 2012 1:20 PM

NancySLAZ

NancySLAZ
Sun Lakes, AZ
(Zone 9a)

December 11, 2012
9:26 AM

Post #9355566

Yes, my favorite is pumice and, luckily, out here in Phoenix, I can still get it. It has become harder to get a good size quantity and much more expensive than in the past. I still search it out though. It has all the qualities I want for my C&S.
Opa_In_Ga7b
La Grange, GA

December 13, 2012
7:43 PM

Post #9357728

[quote="Baja_Costero"]Pumice is volcanic glass which is full of little air pockets. Vermiculite is processed from a mineral which expands when heated. Pumice is much heavier, holds less water, and has a lower cation exchange capacity. Otherwise they perform roughly the same role in soil mixtures, though they are definitely not interchangeable.[/quote]

nice explanation...thanks

palmbob

palmbob
Acton, CA
(Zone 8b)


December 13, 2012
9:37 PM

Post #9357774

many growers of succulents here in California use pure pumice as their 'mix' and just add a dilute fertilizer to the water either weekly or sometimes with every watering. Nearly impossible to rot a plant growing in just pumice.
plantsforpeg
Ventress, LA
(Zone 8b)

December 14, 2012
9:20 AM

Post #9358064

Thank you all for your explanations about pumice. I couldn't find chicken grit here and expect the same for pumice, but will look for pumice once I go to "the big city".
helenchild
Decatur, GA

December 25, 2012
4:48 AM

Post #9366563

I used chicken grit for awhile and didn't think the plants responded well planted with it. It is heavy and seems to compact the medium. But maybe others have better results. I am back to perilite since pumice, which would be my first choice, is expensive to ship back to Georgia.
Helen
xuling
Windsor, CA
(Zone 9b)

December 25, 2012
5:05 PM

Post #9367010

What is the difference between pumice and 5/16 inch red lava? I put in the size so you don't think that I am talking small rock size. Xuling

Baja_Costero

Baja_Costero
Baja California
Mexico
(Zone 11)

December 25, 2012
9:06 PM

Post #9367167

They are sort of similar. From the Wikipedia,

> Scoria differs from pumice, another vesicular volcanic rock, in having larger vesicles and thicker vesicle walls, and hence is denser

http://en.wikipedia.org/wiki/Scoria

I don't know how they would be different functionally, but my mix usually has a bit of both (more pumice than scoria).
xuling
Windsor, CA
(Zone 9b)

December 26, 2012
5:11 PM

Post #9367893

Thanks Baja, I use lots of scoria with the cactus mix I buy (about 50/50) and if in the ground I dig deep and then fill with the mixture and then surround the top of the hole with decent size rocks and fill more soil mixture so the depth can eaily be over 1 foot. After planting I surround the plants with small or less small rocks. Despite all the rain most of the plants survive year after year. (some die). Xuling

Thumbnail by xuling
Click the image for an enlarged view.

amanzed
Los Angeles, CA
(Zone 10a)

January 12, 2013
10:34 PM

Post #9383328

I also read that scoria (red lava) is aerated basalt and can be fairly alkaline, while pumice is felsic (largely feldspar and silica), and is more neutral in pH.

Chemically they are not the same. Though I have success in both, I've definitely failed more often in scoria than in pumice.

Some plants just don't seem to thrive in scoria, even though I like the visual color contrast. Because of that, I'm more likely to use it as top dressing than primary growing medium. I even think my acidification routine moderates the alkalinity of the scoria, but it is still not as successful as pumice.

These are just my personal observations. Of course this isn't scientific; my idiosyncrasies may the the culprit. Maybe if I did something differently, scoria would be just as good or better than pumice.

palmbob

palmbob
Acton, CA
(Zone 8b)


January 13, 2013
7:39 PM

Post #9384104

I like the look of scoria better, but it is definitely much more effective at retaining water, and that can be really bad for some succulents. I find it's pretty good for cycads and palms, though... but I avoid its use for potted succulents for the most part now. I restrict my use of scoria to when I am ammending a garden soil, or making large raised planters where I do not want the white color of pumice or perlite to stand out. Then I just add a LOT of it and less organic material. Still, things stay wetter longer for me (which can be good, too, in hot summers). I certainly do not find them comparable though. Even perlite and pumice are much different (in a different way) and hate having to use perlite (not heavy enough and creates a toxic cloud of microparticles that make me gag when I use it... floats to the top of the pot, too and does not make a good top dressing... always have to add some rocks or large sand when using perlite in pots).

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