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succulent vs cactus soil

succulent vs cactus soil Molly's Gritty Mix for Cactus & Bonsai

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Description

succulent vs cactus soil Molly's Gritty Mix for Cactus & BonsaiQuick answer: what is Molly's Succulent Mix? For: succulents, cacti, bonsai, Haworthia, Echeveria, Sedum, Jade, and any arid environment plant. What's in it: high mineral gritty blend of pumice, lava rock, and crushed bark. Low organic matter by design. Why it works: succulent roots are built to drink fast and dry out fast. The gritty structure drains in seconds and holds zero standing water, so roots don't rot. Pre rinsed and pH balanced straight

Quick answer: what is Molly's Succulent Mix?

  • For: succulents, cacti, bonsai, Haworthia, Echeveria, Sedum, Jade, and any arid-environment plant.
  • What's in it: high-mineral gritty blend of pumice, lava rock, and crushed bark. Low organic matter by design.
  • Why it works: succulent roots are built to drink fast and dry out fast. The gritty structure drains in seconds and holds zero standing water, so roots don't rot.
  • Pre-rinsed and pH-balanced straight from the bag. No salt flush required.
  • Bonsai-safe. The grit profile matches what serious bonsai growers blend by hand from akadama, pumice, and lava.

More plant-specific guidance: Ultimate guide to growing succulents indoors, Potting soil vs potting mix.

Succulents and cacti evolved in arid, mineral-rich environments where water moves through gritty substrate in seconds. Their roots are built to drink fast and dry out fast. Standard potting soil holds moisture for days, suffocates the roots, and rots them from the bottom up. The fix is a high-mineral, low-organic, gritty mix.

Molly's Succulent Mix is engineered to mimic native desert and rocky-slope substrates. A blend of pumice, lava rock, and a small amount of organic matter that drains in seconds and forces the soak-and-dry watering rhythm succulents need.

The gritty-mix philosophy

Most "succulent soil" sold at garden centres is regular potting soil with sand mixed in. That's not what these plants want. The right mix is roughly 70% mineral aggregate (pumice and lava rock) and 30% structural organic (coir, charcoal). Water hits the surface and runs through within seconds. Roots get a brief, intense drink, then dry conditions for the next 1 to 2 weeks. That's how succulents stay alive in pots.

What's in the bag

  • Pumice (volcanic, lightweight): the mineral backbone. Holds a tiny amount of water inside its porous structure, but lets the rest drain freely.
  • Lava rock (red lava): chunky drainage and heat retention. Roots love the warmth differential it creates.
  • Coir fiber (small percentage): just enough organic to retain a little humidity and prevent the mix from drying to a brick. Not enough to compromise drainage.
  • Horticultural charcoal: filters salts from tap water (succulents are surprisingly sensitive to mineral buildup).
  • Calcitic limestone (trace): buffers pH to the slightly alkaline range (6.5 to 7.5) most desert succulents prefer.

Low peat content, no worm castings (succulents don't want a nutrient flush), no commercial fertilizer. The whole mix is intentionally lean.

Plants this is for

Designed for succulents and cacti:

  • Echeveria, Sedum, Crassula (jade), Sempervivum: the classic rosette succulents.
  • Haworthia, Gasteria: they prefer slightly more shade but want the same gritty drainage.
  • Aloe (vera and others): medicinal succulents, this mix prevents the rot they're prone to in heavier soils.
  • Most cacti: Mammillaria, Echinopsis, Opuntia, San Pedro, golden barrel.
  • Lithops (living stones): require fast drainage to stay alive year-round; this mix is well-suited.
  • Bonsai with high drainage needs: juniper, pine, and certain deciduous bonsai work well.
  • Caudex plants: Adenium, Pachypodium, and other swollen-stem species that need fast drainage at the base.

Not for: tropical "succulent-looking" plants like Hoya, Christmas cactus (Schlumbergera), or Easter cactus, which actually prefer humidity-retaining mixes. For those, use Molly's Aroid Mix.

Watering with gritty mix

The right rhythm: soak and dry. Water deeply, then wait until the mix is bone-dry before watering again.

  1. Wait until the top 2 to 3 inches feel completely dry. For most succulents in standard 4 to 6 inch pots, that's every 10 to 21 days indoors.
  2. Water until liquid runs clearly out the drainage holes. Don't dribble. Soak.
  3. Discard any water in the saucer. Do not let the pot sit in standing water.
  4. Wait. The plant will let you know when it's thirsty (slight wrinkling of leaves, lighter pot weight).

In winter, water roughly half as often. Most succulents go dormant or semi-dormant.

FAQ

Why is this so heavy compared to other succulent soil?

Because it's mostly minerals, not peat or coco coir. The weight is what makes it work. Light bag means light drainage, which is the opposite of what succulents need.

Can I use this for bonsai?

For tropical bonsai, no, they want a moisture-retentive aroid-style mix. For drought-tolerant bonsai (juniper, pine, certain deciduous species), yes, this mix or a 50/50 blend with finer organics works well.

Will the mix break down or stay porous over time?

Stays porous. The mineral components (pumice, lava rock, charcoal) don't decompose. The small organic fraction breaks down slowly. Most succulents in this mix can go 2 to 3 years before repotting.

Should I add fertilizer?

Sparingly. Succulents are slow growers and don't need much. A diluted (~1/4 strength) cactus-specific fertilizer once during the growing season (spring) is plenty for most species.

Packaged in a heat-sealed resealable bag. New formula released April 2026, see the formula release announcement for details on what changed.

Related care guide

Watering, light, and repotting fundamentals for succulents and cacti.

→ Read the Succulent & Cactus Care guide

Have questions? Read the Molly's Succulent Mix FAQ for detailed information on watering, repotting, and which succulents this mix works best for.

New: the complete soil guide

Not sure if you need cactus soil or succulent soil? They are the same thing. Read: Best Soil for Succulents and Cactus →

Not sure which mix your plant needs?

Take our free 60-second Soil Finder quiz → Diagnose the problem and get the exact Molly's mix and amount for your plant, plus 10% off.

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Darcie Reads A Lot
West Palm Beach, US
★★★★★ 5
Unexpectedly emotional and packed with action!
Format: Kindle
Why do I suddenly want nothing more than a tiny wyvern to snuggle with?! It’s adorable and I absolutely love all of those moments! Wings of Stars was everything I’ve come expect from this powerful author duo. The fact that it’s written by two different people is completely transparent to the reader and they’ve brought us another world and characters that we’re all emotionally connected to and fully invested in! The injustice that we see from Alfemir in the many forms in which it comes is infuriating and makes me desperate for the conclusion of the story so they can all get what’s coming to them! I love all the guys right now, with one exception, and if you’re read it, you know exactly who I’m talking about. Bastian is hilarious - he was the comedic relief through an otherwise quite serious story. My heart bleeds for him and I can’t wait to see how he progresses through the series. Parts of Wings of Stars were unexpectedly emotional and of course I was left with my jaw on the floor at that cliffhanger! Next, please!
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Reviewed in the United States on October 18, 2025
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josh portwood
Phoenix, US
★★★★★ 5
Niz !!!
Format: Kindle
First, let me say that I love both of these authors. I have been hooked by both ever since I discovered their writings, and I follow their social media groups closely. This book did not disappoint. Sure, there are several questions that I have, a couple of times I went huh (which I won't get into because I do not want to offer any spoilers) and I hated the cliff hanger lol, but I cannot lie and say I didn't love the book, because I did. The twist on angels was new and fresh, even though that is part of my questions. The beginning and ending were the better parts, the middle was needed but sorta bogged a little. Kieran was confusing but relatable. Niz is BY FAR the best character of the book, love NIZ. For me, Bastian is a close second, always loved the crazy ones. The other men were good, but Steele gets on my nerves and as of right now, IMO, he doesn't belong, but we will see how that goes. I have lots of questions, but this was an excellent start to a new series and I cannot wait for the next book. Highly recommend
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Reviewed in the United States on February 21, 2024
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shark
Boise, US
★★★★★ 4
fallen destiny? more like destined to fall in love
Format: Kindle
Kieran is an angel, but she doesn't have an affinity. Nothing angers her father more. If she doesn't find an affinity soon she will be cast to earth & have her wings removed. But she has the choice to become a fallen angel, wings turn black, & live her life on edge. Towards the end of the book things start to make sense. Gabe’s nickname for Kieran, Steele’a hatred, Bastian’s belief that Kieran is powerful. This book ended literally during a war? As one of her friends was injured, and admitted a bit secret? Talk about cliff hanger. The next book comes out August 5th.
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Reviewed in the United States on July 8, 2024
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Caylee T.
San Leandro, US
★★★★★ 5
Well holy moly!
Format: Kindle
Holy moly that story definitely had me hooked! Kieran was definitely a character that I immediately adored. She has obviously had to deal with a butt load of too high expectations from her father (who is 🤬).. She has been helpless when it came to finding out her affinity with so many years of no answers & perceived failure. When Ronan, gives her a small inkling of hope that she be a Beast Tamer, she jumps into it. But again she doesn’t seem to fit. But when she runs into Gabe again, she ends up helping him & rethinking her life in Alfemir. And when the opportunity comes she decides leaving is the best option. But when Ronan demands he comes with her & then the random appearance of Bastian, she is feeling very overwhelmed. After she chooses to fall with them, they land on earth exactly where Gabe is located only to run into Steele who is a person that I was finding hard to like. After training, she eventually finds out she does have an affinity & it’s one that no longer exist & is incredibly powerful but also has a prophecy attached to it. I feel incredibly bad for her on she learns about the prophecy & Steele’s connection with it too. But that ending, with the battle scene & Niz….yeah definitely was not expecting that but hello I am all here for it too! Absolutely amazing start of a series & I for sure will be waiting for the next one to come out. Amazing job!
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Reviewed in the United States on September 26, 2024
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BobbiJo- SpicyBookswBB
Port Orchard, US
★★★★★ 5
So good!
Format: Kindle
Wings of Stars was a fantastic first book to a new series. It grabbed me in its clutches within the first chapter and kept ahold of me. This new world of M Sinclair and RL Caulder’s is all about angels and mythical creatures. It’s full of drama from all points. From Kieran’s awful home life to keeping the stars alive and everything in between. Kieran is our FMC and despite everything she keeps her spirit and defiance. Keeping to their norm, there is a group of guys for our FMC but they definitely aren’t established yet, and not fully cemented yet into being a group rather than her choosing between them. Ronan is so sweet and gives off Daddy vibes Gabe is also sweet and wants the best of everything for Kieran and will defend her against anyone Bastian is slightly unhinged but I loved him immediately Steele is a jerk… just as you find redeeming qualities, he screws up again… but yet I still want him to redeem himself. There’s another one… but if I gave his name I would be spoiling a plot twist so you will just have to find out yourself… but you’ll love him as much as I do. This is a slow burn but the little bit of spice we do get is hot, especially with the dirty talk.
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Reviewed in the United States on February 19, 2024

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