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should cactus soil be dry

should cactus soil be dry Molly's Gritty Mix for Cactus & Bonsai

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Description

should cactus soil be dry 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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4.6 ★★★★★
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Bookphile
Massapequa, US
★★★★★ 5
Practical and eye-opening guide for parents
Format: Kindle
This book had a profound effect on my thinking about how to be a parent. I don't think of myself as the type who hovers, but I'm starting to understand that I hover more than I realize. It's not that the author is advocating for hands-off parenting. Instead, she points out a lot of the ways in which parents take the reins and deny their kids all sense of control, and how detrimental that can be. We want our kids to grow up to be responsible and capable adults, but how can they do that when we take away their sense of autonomy? This book made me realize it's more important for me to teach my kids life skills like how to manage their time than it is for me to be managing every detail. My doing so comes from good intentions and a desire to see them succeed, but at the same time it conveys subtle messages to them I don't want conveyed. I read a lot of psychology and social science books because the research just plain fascinates me. While this book offers a lot of anecdotes, it's also infused with an excellent grasp of research. Lahey's background in education shines through, and her suggestions are grounded in the same evidence-based research that I've read. If kids seem different today, it's because they are, and it's not just technology that's driving this change, it's the way parents treat their children and how they view them. We want them to be successful, but in our test-driven, high achieving culture, we are sometimes guilty of emphasizing the wrong things. After reading a great deal about helpless college students, children suffering from stress-related ills, and the mental health problems plaguing universities, this book helped me form an idea as to why this may be: rather than teaching our children to work for the things they want, we're setting them on a prescribed path and sending them the message that they're only okay as long as they follow that prescribed path. Reading this book makes the mystifying question of why children don't want to take risks quite clear: because we've taught them that there's nothing worse than failure. Yet this book doesn't just discuss research, it also offers a lot of practical solutions for parents. Fair warning, though: not all of these suggestions are easy to swallow. This is where some of the pain came in for me, because I saw myself reflected in some of the behaviors Lahey suggests parents need to break. Giving her suggestions a try isn't going to be easy from a parenting standpoint, and it will require me to retrain myself as well. I also think there's a lot of value in how this book offers some very good insight into the educational system, which I think is a big benefit to parents who don't come from a teaching background. Lahey proposes that parents and teachers work as partners, and she offers suggestions for how parents can open up dialog with their kids' teachers. Considering how adversarial our current culture and politics paint the relationship between educators and parents, there is a great deal of value in this aspect of the book. It doesn't serve anyone for parents and teachers to be at one another's throats, not when both sides want the same thing. This book offers constructive ways parents can form that partnership with teachers, so that everyone can work together toward the same goal. I highly recommend this book to both parents and educators.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 29, 2015
A
Verified Purchase
Amazon Customer
West Palm Beach, US
★★★★★ 5
I thoroughly enjoyed reading this and as the Principal of a Middle ...
Format: Hardcover
I thoroughly enjoyed reading this and as the Principal of a Middle School, I found much truth in what she has written. I found myself thinking back to my days as the parent of burgeoning, wonderful and successful adults. The suggestions Ms. Lahey offers to her readers are based in experience and in conversations with her peers and others in the field of child-rearing and education. These are ideas that have worked for her, and others, and she passes along that wisdom and experience. Interestingly, I passed this book on to my 33 year old daughter who works in the private sector with a small, but growing, tech company. She has found the ideas presented here very valuable in dealing with her co-workers, the people who report to her, and even her boss, all of which I found very interesting. The best thing about this book is Ms. Lahey's voice. She sounds compassionate, not absolute, "this is the ONLY way you should ...". She puts out the propositions and then provides what she found as possible courses of action, I would highly suggest that any parent of young children, any teacher and certainly any building principal read this book with great gusto!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 22, 2015
K
Verified Purchase
Kennon McCaa
Phoenix, US
★★★★★ 5
Extraordinarily Helpful - A total game changer
Format: Kindle
I read this book at the recommendation of my son's school counselor. It was a total eye opener and will greatly impact and change the way I raise my son going forward. This book could have easily been titled, "The way I used to parent" because it is so accurate down to so many details as it describes my parenting techniques and motivations. I have made many changes already and my son doesn't quite understand who I am anymore. I'm certain that he appreciates the changes although he's a bit disoriented currently, but I know he will be better off in the long run. I wish there were more anecdotes or perhaps several role playing scenarios added to help offer more suggestions on how to handle more situations but the book was extremely helpful and insightful regardless. Most of the anecdotes I saw play out in our family or with other students from my son's school within hours or days of reading the book. It was amazing.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 22, 2016
R
Verified Purchase
Richard Scott
Alexandria, US
★★★★★ 3
Good book for parents
Format: Hardcover
A good review for parents to keep as they struggle, but as reviewer noted a bit oversimplified. I bought after had listened to a panel on Forum discussed screen time. As a grandparent, sitting with my wife each on our I pads, I recall eating at restaurants when you look an see so many n smart gadgets texting, tweeting selfing and wonder where the talk is. I did post a photo of a wee grandchild playing while tv playing and three other in room were on their gadgets. The discussion was good. No answers. But, the discusses all recommend Lahey's book. In a period when helicopter parents strive for kids and overpower them, success comes without self motivation, and absent of failing , or at least the skills needed to overcome failure, grit and resilience and desire. Good to,learn early that they are part of a community and tasks are performed not for bribes or pay, but part of all pulling together. She spends a few pages on bullying and how to deal with it. Certainly for sandbox or recess in early years letting kids figure out how to work together through squabbles and fights is good. How do we handle the issues when kids get older? Teddy Roosevelt said learn to box. Sometimes really big kids pummel the weak. Stepping in may be needed. Bullying which now is felt a larger part of school with snubbing, nasty notes, cliques causes no bodily harm, but is part of life. Dealing with it Is a difficult task for teachers and parents. I applaud the new generation of teachers and parents who work as teams. A quarter century ago the moms at our kids elementary school were called the mafia moms. No prisoners. I recall an episode when well dressed ladies said whatever the vogue n radon gas wrong, ..they knew cause they could read and they didn't have to learn what their kids were saddled with and the new math, now very old, was wrong. Maybe now teachers and parents can complain together about the evil core, or how much time the teachers should spend prepping for a test.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 16, 2016
B
Verified Purchase
Basil tree 45
Port Orchard, US
★★★★★ 4
Good tips, though possibly over-obvious to some...
Format: Kindle
if you're prone to be a helicopter parent. If you're not, then I would say read it anyway so you can see where other parents might be approaching parenting. It pretty much fits in with other parenting books I've read such as "How Children Succeed" by Paul Tough, and "Grit" by Angela Duckworth. As with any parenting book, how useful you find it depends on what you're already doing. One of the examples that the author uses in the book is that of a kid forgetting his/her lunch at home. If you "rescue" the kid by driving his lunch to school, then there's no motivation for him to remember it in the future. Got it! When I was a kid and I forgot my lunch at home, I was not then able to concentrate at school for fear of my mother's reaction when I got home. She needed to "teach me a lesson" by shaming me for forgetting it, cussing me out, turning it into a moral issue, and giving me the silent treatment for several days. When that's the consequence for forgetting a lunch, then going hungry for a day seems trivial. In fact, it would be less stressful to simply declare that I'm no longer bringing lunch to school anymore so that I can't possibly forget it again, and protect myself from a bipolar parent's mood swings. But some parents can't even let their kids go hungry for the day, even though suffering the consequence's of one's behavior doesn't even feel like punishment. If you had a parent like mine, you would hardly need to read this book, and yet I would recommend it so you can understand what other people's parents are doing. My kid is 2 now. I pretty much let him learn from experience, although I outright ban dangerous and unhygienic behaviors. This book pretty much reinforces my approach anyway.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 2, 2017

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