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what type of soil for cactus

what type of soil for cactus Molly's Gritty Mix for Cactus & Bonsai

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Description

what type of soil for cactus 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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Savannah L.
Boise, US
★★★★★ 5
This book healed me
Format: Paperback
Beautifully written and illustrated. Although Thi Bui and I have astronomically different life experiences, I still found I could relate on a deeply personal level. This book taught me empathy and forgiveness at a time in my life where I struggled to have it. Bui nailed the complicated feelings and emotions that comes with confronting abuse, abusers (who happen to be your parents), and the painful impact of generational trauma on both the parent and child. Highly recommend this book to anyone who is on a path of healing their own broken heart.
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Reviewed in the United States on June 16, 2023
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Gabby M
Lowell, US
★★★★★ 4
Powerful Family History
Format: Paperback
After the birth of her son, Thi Bui feels an increased sense of urgency about learning the stories of her own parents. Like all but her youngest sibling, she was born in Vietnam, though the children came of age in the United States. While the war itself haunts all of them, was the reason they left their homeland, the wounds her parents bear go far beyond the military conflict. This was only the second graphic novel I’ve ever read (both have been memoirs), and like the first was also selected by my book club. I feel like the limitations of the format mean it will always be a less preferred one for me, because I found myself wanting more words, more depth to the writing itself. But the story is deeply compelling, detailing her father’s brutal childhood, her mother’s much softer one, how they came together, and how the Vietnam War disrupted the future they thought they might have. It’s not as straightforward as “Americans bad”, and Bui is not afraid of the moral ambiguity of that time and place, where the best interests of the majority of the Vietnamese people was an open question for larger forces that seemed to have little room for consideration of what might have actually made regular lives easier to lead. And apart from the larger geopolitical machinations around them, the family had their own share of tragedy, including the death of their first child and a later stillbirth. But three living children and another on the way was enough for her parents to make frantic arrangements to leave, finally succeeding and eventually making their way to the United States. But of course, that was not the end of their story, just the beginning of a new chapter. Bui’s childhood as she depicts it makes it clear that it wasn’t the stuff dreams are made of, but what shines through is her tremendous empathy for her parents and how they became the people she experienced them as. Overarching the narrative is a meditation on parenthood, as it is the birth of her own child that inspires her to ask her parents more. They might have made major mistakes, but it is clear that they loved their children and did what they thought was best for them, making countless sacrifices to give them the best opportunities possible, even if that love was not always shown the way that they wanted and needed to feel it. Vietnamese perspectives on the war in their country were not something I was exposed to growing up (honestly the Vietnam War itself wasn’t something I remember being taught with particular rigor in high school apart from its connection to electoral politics), and I appreciated learning more about the history of the country and how the people who actually lived through the conflict thought about it. Even though this is not my preferred format, I think Bui uses it well to engage in some non-linear storytelling and to very literally illustrate what she’s trying to get it, like the way she parallels the way her relatively rural parents must have felt seeing Saigon for the first time with the way she felt when she first moved to New York, a sense of awe and possibility. It’s a powerful, moving work and I would recommend picking it up!
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Reviewed in the United States on February 3, 2026
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Riyen
Chelsea, US
★★★★★ 5
Truly, the best we could do
Format: Kindle
An excerpt from my analysis essay I submitted for my literature course: By revisiting her family’s past from before, during, and after the Vietnam War, she gained a deeper understanding of the emotional burdens her parents carried and the sacrifices they made that defined the entirety of their lives. Bui’s illustrated graphic memoir reveals that trauma does not simply disappear over time; instead, it becomes inherited, processed, and transformed. Through this process, Thi Bui is able to move toward empathy for her parents, acceptance of who they are, and a more complete sense of self.
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Reviewed in the United States on April 21, 2026
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Kathy
Belleville, US
★★★★★ 5
Phenomenal. A must-read!
Format: Paperback
I first learned about this book only a week ago when visiting my sister for Thanksgiving in Eugene, Oregon. We went to the Jordan Schnitzer Museum of Art where I saw some work on display by the author, and there was a copy of her book available to look at, so I perused through and decided to buy it and read it. I'm so glad that I did! This is an incredible, poetic story that spans four generations, multiple wars and conflicts, and examines the fragility of the author's relationship with her parents and with her sense of place and motherhood. This book is one of the best I've read in a long time, and the art is moving and beautiful. It gave me new insight into the struggles of refugee life, and created a truly relatable narrative. I devoured this story in one Saturday. I highly recommend it.
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Reviewed in the United States on December 2, 2018
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Sav
Phoenix, US
★★★★★ 5
A well composed memoir
Format: Paperback
Full review on nguyentoread.com The Best We Could Do is Thi Bui's graphic memoir. Thi was born in Vietnam three months before the Vietnam War reached what we consider to be the end of the war. She came to America with her family in 1978. Bui's memoir spans multiple generations. In learning of her mother's and father's pasts, we learn the history of their parents. We see the struggles and pains of two people from very different walks of life trying to live during a time of war and chaos. We see glimpses of the agony everyone in the middle of the Vietnam War faced. Those who were not directly involved on either side but were caught in the middle of larger powers at war. This memoir more closely details the lives of her parents leading up to them arriving in America and making their life there. I was unsure if this memoir would focus largely on the experience of being a Vietnamese immigrant in America. There were parts that showed how it was for Bui's parents in a country where tensions were still high after the Vietnam War, where discrimination largely due to that was overt, and where degrees were not recognized and people who had spent their lives working and creating careers for themselves were not qualified for most work and had to hurdle multiple challenges to learn a language and complete education all over again if they wanted to provide a better life for their children. What Bui so beautifully captures in this memoir is the why behind how her parents were in raising her. Although Bui was born in Vietnam she was young when her family arrived in America. So I think her experience is one that many first generation Vietnamese-American people of my generation can understand and sympathize with. The wanting to know why their parents are the way they are but unable to ask because many have parents, like Bui's mother, who reluctantly share their stories and don't allow their children that glimpse that could help them better understand. In the panel which was most poignant to me, Bui draws her father as he looks over her work that would become The Best We Could Do. He says "You know how it was for me. And why later I wouldn't be... normal."
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Reviewed in the United States on May 20, 2019

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