- The Weed Blog https://www.theweedblog.com

What is the Best Soil for Growing Marijuana?


What Is The Best Soil For Growing Cannabis?

Marijuana growers need to make many different decisions when they are planning out how to grow their plants. It starts with whether to grow indoors or outdoors. Indoor growers need to choose whether to use soil or a hydroponics system for their indoor setup. In case you haven’t used hydroponics before and are willing to dedicate the money to it, it can be a very practical option to choose for the best marijuana soil.


Generally speaking, newer growers decide to grow their plants in soil at first. Taking this step allows them to get a feel for the undertaking of growing marijuana plants without risking huge amounts of money and extra time spent researching. Either route can be useful, but in this article we will cover information for people who want to grow their marijuana plants in a soil-based system.

Growing marijuana in soil

marijuana soilMarijuana roots extend deeply into the soil as they hunt for the best sources of water and nutrients. This is why indoor growing requires a different technique that will compensate for this lack of space. To put it simply, the root systems of indoor marijuana plants need to be smaller. The water and nutrients come from the grower rather than natural sources in wild soil, so root systems should be able to thrive without extending out too far.

The main thing you need to worry about with root systems is that the temperature stays relatively warm – around 68 degrees Fahrenheit. You will also want to check that there is plenty of water and oxygen throughout the soil. Make sure to download my free marijuana grow bible at this link here for more growing tips.

marijuana soilPros and cons of soil growing

Irrigation is more easily done in soil because mistakes are more easily made with hydroponic systems. Fertilization is also simpler, if only because people have been growing plants in soil for thousands of years, meaning there is tons of information and advice out there. Soil types can make a big difference in the taste of the resulting marijuana, which is an added bonus.

Soil isn’t perfect, however. It requires lots of space and weighs a lot, making things rather difficult for people growing indoors. Pests and insects are more likely to be found in soil as well, not to mention the fact that some people simply don’t have the “feel” required for growing any plants in soil. Read the article ‘How To Grow Marijuana Hydroponically‘ if you don’t want to grow in soil.

marijuana soilMarijuana soil container size

The size of your plants’ containers will alter the size of your plant’s root system. If the roots have more space, they will fill out their space even more quickly – making growth easier. Problems occur when the plant outgrows its container.

Regular sized marijuana seedlings do well in a container that is 10x10x10 centimeters until it reaches the height of between 25 and 35 centimeters. At that point, you will need to transplant it to a container that is two times the size of the first one (15x15x20 centimeters). When the plant surpasses the 80-centimeter mark, you will need to transplant it to a container that holds 10-12 liters. The container size keeps increasing as the plant exceeds the 1-meter mark, and so on.

marijuana soilMarijuana soil nutrients

Soil already has lots of nutrients naturally, since it is made up of organic materials. Materials like rotting vegetables and animal manure cannot be placed directly on your plants as fertilizers – they need to be broken down additionally before they are able to be absorbed by the plants’ roots. Worms and insects are useful “tools” when breaking down these materials, as is rain. Water dissolves these and other materials allowing them to be absorbed by the marijuana roots.

While these things happen easily and naturally in the wild, it is not so in indoor growing systems. That is why beginning with soil that is rich in nutrients (as well as sterilizing it before planting) is so important for indoor growers. The best way to sterilize soil is to use heat, which is not 100% effective but will help ensure the safety of your plants nonetheless.

Nutrient-rich potting soil mix can be found at your local garden center, and it can also be made on your own. Oxygen, a lukewarm environment (approximately 20 degrees Celsius), plenty of water, a balanced pH value, and lots of nutrients will create an environment that encourages healthy growth in any marijuana plants.

As an indoor grower, you will have to be especially aware of what your soil needs to contain. The pH value, humidity, and nutrients will make a bigger difference than you might expect, so keep tabs on these things. Additionally, if your soil doesn’t retain water well, plants won’t have time to “drink” as much as they need to. Too much water retention, however, can encourage fungal growth, which would lead to devastating root damage. Use vermiculite, sphagnum moss, turf, or perlite to alter the retention of your soil.

marijuana soilMake marijuana soil yourself

Soil is pretty easy to mix, as long as you pay attention to the ratios. These ratios also will change according to which stage of life your marijuana plants are in. Early stages of life, for instance, require balanced amounts of turf, perlite, and worm meal. Vegetative and flowering stages need balanced amounts of turf, worm meal, and compost instead.

To decrease a too-high level of compost, simply add chalk. You can also use liquid fertilizers as a way to add nutrients to your soil, and they can be made yourself. Just be sure that the liquid is homogenous and has equally balanced nutrients, thus preventing it from “burning” your plants. For nervous beginners, a store-bought option is probably your safest choice.

Watering marijuana soil

Watering in soil can be difficult because it varies according to the soil type and environment. Hot environments need more water while cool environments require less. Water works to move necessary nutrients and minerals to the roots, where they are then transported to the rest of the plant. Water also works to cool down plants when they are too warm and to keep the structure in line. Perhaps most important of all, water is a necessary ingredient for the process of photosynthesis to successfully be carried out. As a general rule of thumb, simply water until the soil is moist but not wet to the touch, unless you want fungi to grow and harm your marijuana plant’s roots.



About Author

Robert Bergman is a master marijuana grower. Robert Bergman is the author of 'Marijuana Plant Care' and 'The Marijuana Grow Bible'.


  1. I have been told that coco is a good way to get young plants going and will make for a better results than potting soil or m.

  2. ProfessionalGanjaSmoker on

    Hi guys I´m planning to grow weed. Is it okay to germinate the seeds and plant them for 2/3 weeks in a vase and then transplant it outdoor in the soil?

  3. Hello, I accidentally bought soil which contained wood chippings. I also read that it is not a good thing to grow weed with wood chippings. Can someone tell me why it is bad? I might have to buy more soil :(

  4. something has changed i have lots of leaf growth in last stages of bloom ? same feed same conditions any advice?

  5. In answer to your 1st question, yes of course you can, the 2nd is mandatory, it needs time to brew as it were.

  6. if you purchase Terrizilla soil, it has everything in in. U just need to use water and no added fertilizers. It worked really well for our little experiment. You can get it at most switched on gardener stores or online. Its about NZ$20.00

  7. i have heard that 2nd hand soil is absolutely useless as it is full of burnt out nutrients,. We have been told never to use it twice.

  8. All of 12 soil textural classes loam soil is the best for most of the plants cultivation. Because loamy is the intermediate mixture of sand, silt and clay. In loamy soil the three major components of soil remain in suitable amount for plants well growth.

  9. i’m planting cannabis, single plant in a pot. for past 20 days i think.. daily i am pouring some water.. in day time i keep in outdoor and in night i keep it in a box with cfl bulb, box is fully closed with some holes.
    give me some tips and steps to grow better.. and my steps are correct?

  10. Looks lile the soil has burnt the plants. What you should look for is the NPK of the fert that has been added to the used soil*. Different plants have different needs, one soil mix does not accomodate to all plants.

    *I just assume it is used with ferts already in it.

  11. The best advice I can give is to watch the YouTube video “Grow Like a Pro” put out by High Times a few years ago…….

  12. WatchingAngels on

    I realize this thread may be inactive, but if there is still someone on the other end, I have 2 questions – one about scaling and the other about procedure.

    1) Do you end up using all 8 bags of base mix? Meaning that if someone wanted to make smaller batches, they could divide all other ingredient quantities listed by 8 to obtain a per-bag recipe.

    2) Is the 30 day ‘cook’ period mandatory? Can it be reduced within an acceptable range?


  13. I would reccomend germinating your seeds in a glass of water for only 24 hours or until the seed splits and you are able to see the taproot. Germinating in soil takes much longer and can be much more tedious.

  14. my daughters father-in-law has a friend that has a legal grow and he gave Mike all his soil from last years grow. My daughter used some of it to fill her newest flower garden as did Mike and we all thought that we would have a great growing season except that the soil has been killing everything. Anyone know why?

  15. always check the ph level of river water. our river is a 7ph most of the time. during the fall when the trees are dropping leaves it can become acidic. always check ph. it will still be better than city water.


  17. It says you use 7 gallon containers and “just add water”. What would I have to do to make “just add water” work for 20 gallon containers?

  18. what is the best water for outdoor growing using this mix? if i grow near a river could i use that water?

  19. Im a first time grower i havent planted my seeds yet bcuz i dnt know what soil to use :o please help i need a just water method soil that will last the whole plants life time nothing complicated
    contact me to my email so i can ask you some questions

  20. Let them all grow and then wack the ,ail when it.identifies itself. Then growth the two females in a way where pruning properly will allow them light, strengthening ability, and give you sticky high yields. IMHO.

  21. lovesthebud420 on

    im a first time grower and want the most successful bud i can get, were you say “Here are the amounts we have found that produce the best tasting buds and strongest medicines” underneath that were you have a list of things to add to the base soil does that show how much to add to one bag or eight?

  22. first timer. useing 1 part vermiculite 3 parts perlite 3 parts topsoil 1 part mushroom soil , they are all organic. will this be ok or am he f@#@! it up?

  23. You said ”I will use this mix for a full year just adding like 30-50% in the lower
    potion of the container and plain base soil in the top portion.” Do you reuse the soil after the plant is done or you use the left over mixed soil in the trash can for a year?

    How much Mycorrhizae do you add?

  24. What the fuck? If you’re going to depend on the sunlight from outside to give them light then plant them outside for god sake. You need to buy some lights if you want to grow them indoors or otherwise you’re going to end up with dead plants. Also your light schedule should be 18h on and 6h off.

  25. Nezzie Spinney on

    Hey man they getting roughly 12/12 light n dark , but just the sun when will more leaves come , i just transplanted them from a small jiffy hot house to the big pots just wanted to know if they will grow the soil i started them from seed was on my pic and i bought today the premium potting mix today when should i transder them again or should i just leave them in the soil as is ,??? I need help pls ???

  26. Give more them more light. Make sure your light cycle is proper. Keep growing. Soon move to the veg stage. Look on YouTube how to grow weed indoors you will get many results.

  27. Nezzie Spinney on

    First time grower started with my seeds in
    Im just wondering what do i do next ? Its been like this for two weeks ? Need help

  28. Nezzie Spinney on

    First time grower started with my seeds in
    Im just wondering what do i do next ? Its been like this for two weeks ? Need help

  29. Why would u want indoor taste from outdoors? The best thing about outside is the taste.. indoors u get potency and outside u get that earthy inhale.. Ibjust dont get it u straight delivered an oxy moron

  30. aliensRdrones on

    I have been testing different methods for desert growers add 5 2 cubic ft bags of Lowes top soil , add one half bag chicken manure, one quarter bag steer, 2 bags hydroponics mulch, 2 1.5 bags hydroponic house plant soild, add coco shell 5lbs, 1lb sea kelp,5lbs peat moss and 3 lbs pearlite add 10lb natural pea gravel the smaller the better and 2lbs clean washed sand add add 1 bag 1.5 cft cactus soil mix well add I bottle peroxide large mix very well add to plant pots plant need bamboo reed building with clear roof we use a small swamp cooler to keep temp down adding humidity set on low away from plants pointing inward flowing out through reeds fantastic setup if done righ

  31. FEDupWITHstupidity on

    2-4 people can easily mix large quantities by laying it all on a drop cloth or heavy plastic square shaped tarp. Have each person stand on one of the sides of the tarp. Each person grabs on and one at a time take turns lifting their side high enough to push the dirt to the center and beyond if possible. This is easy and there is no need to jump in and get dirty. You can use your legs to help with pushing your side to the middle. After 5 minutes of mixing, it is thoroughly combined

  32. I’m confused now, but I read online that you can use soil for tomatoes and watermelon and it works good. Should I do this?

  33. long haul drifter on

    im growing autos and wondering can I start them under cfls and then transfer them to the hps after a couple weeks of grow?

  34. Ok Hello Ppl I Have Read Most Of Your Articles And I Am MoRe Lost Then When I Started Im Trying For My First Time To Grow I Have The Soil That Was Recommended To Me The Lights And The Seeds. I Was Told To Put Coffee grounds In The soil Should I Or Not Do So And If Done RightHow Long Would It Be Until I See Some Kind Of Results.

  35. I’ve tried them all. Including neem. Best solution I’ve found is blast em off with water or a air compressor. Do this every 3 or 4 days until you don’t see them any more. Spray down your empty room or tent with Lysol or a strong bleach water solution. Wipe down…And repeat process as soon as you see them come back. Which you will… I have seperate veg. and flower rooms. And between rotations I spray down the room even if I don’t see mites. Others may have things that work for them. This is what I found works for me.

  36. COMPOST! worms

    The best soil is only 1 part of the equation. How fast the soil drys , how much nutrients to give .
    Jorge Cervantes has some good books ,websites ,youtube.

    Another good source is “bio-dynamics” Stieners belief that herbs and weeds removed by man actually regulate molds ,diseases. re-introducing these organic plants or applying to garden compost helps plants thrive in an organic environment

    SubCool has some great vids on youtube and I have only heard good things on his Vids

    back in the day , we had to hide this, We parked our cars miles away from the hydro shop ,paid cash ,told no-one.
    Now information flows freely on the Net
    To all Newbies the best advice I have heard was “whatever keeps it green”

  37. i am a new grower i just bought 6 seeds 2 purple widow 2 thc bomb and 2 white skunk wat is the best soil and food to use to get the best out of my crop

  38. The best I have ever seen grew wild there are nutrients all around you, if leaves start turning yellow not only is there a lack NO2 there is a CO2 defficiency.

  39. White Widow,Purple Kush, Blueberry , Strawberry, Bubble Gum, NYC Diesel, Bubbleberry.TEXT ONLY— 1(213)342-4483
    We sell just the best ,The Greatest Sativa Strains, The Greatest Indica Strains , The Greatest Hybrid Strains

    send us an email at

    Purple Kush
    White Widow
    Strawberry Cough
    Bubble Gum
    NYC Diesel
    Purple Skunk
    Skunk Haze
    Sour Diesel
    Blue Dream
    Jack Herer
    Purple Haze
    Silver Haze
    Maui Waui
    Super Silver Haze
    Northern Lights x Haze
    Durban Poison
    Master Kush
    Hindu Kush
    Double Gum
    Hawaiian Skunk
    Afghani #1

  40. So what about using fine sand for after the germination but before the bigger pot transfer? Do you think this will help retain the initial moisture and guides the root to dig deep for the soil?

  41. The Real Grower on

    Just use Scotts Miracle Grow Soil. It feeds for 3 to 6 months and no need to check the ph level since its already good dirt.

    You might kill a plant giving it that much food.

    You don’t want to kill your tomato plants.

  42. I found a round egg on the top of my soil then I squeezed it and it popped like a lil ball or something…what is it and should I be worried

  43. Midnight train on


  44. Above, there are directions for preparing soil and goes like “Once placed in the containers I water it slightly adding 3 gallons of water to a large garbage can full. It will make the stirring harder next week but it will activate the Mycorrhizae and I think help all the powders dissolve.So now we add water and let it cook in the sunshine. 30 days is best for this concentrate.”  I am confused here about the water being added when, how much, etc.  Seems like there is some missing information here.

  45. Jwilliams198708 on

    Im a first time grower I need someone with good knowledge to give me suggestions on how to setup an outside garden measuring about 12″7 what equipment will I need suggestions are helpful

  46. Tyler Durden on

    Try some Fox Farm soil, it should have enough nutrition to last you for about a month before you need to supplements with additional nutrients.

  47. hey troops, have 4 cuttings rooted and ready to pot, whats the best soil for this early stage?

  48. Cliffyscuts on

     Yes you can if you use sand and rock  see above post pure sand is just like indoor hydro taste with outdoor ease…..   hard to over water or over feed  drains so good …try it I have grown alot out doors and I have never got the indoor taste like I do with until I started this program…

  49. Cliffyscuts on

     When you harvest you will see that it tastes like commercial weed…….. See the post above about growing in sand and rock, I will never use soil again!!!!      Indoor taste outdoors , its all in the chemicals you feed it…… 

  50.  Each plastic container is half rock half sand… just for clarification… gets the all nutrients from hydro chemicals just as a   indoor system 

  51. WHAT WORKS GREAT FOR ME!,COST NEAR TO NOTHING, EASY, NO WORK TO SPEAK of.. You should know about the stages of plants and have some basic knowledge…  I use 7gal or ten gal plastic pots with holes   Fill half with hydro rock… the rest with sand plant and use under 75$ in hdryo chems I feed it 3 different type 1 each day 4 day water only you can water as much as you want.. Dont let chems build up. Add 2 chemicals for budding. Mix just like hydroponics, the water drains good, be sure to  clean chems out for 3 days for taste brfore harvest..  Sunlight!! no ele cost… Hydro taste   but better Hands down the cheapest and easy way outdoors I have ever done with the indoor taste and outdoor kill factor…This all = great taste all for under a 100 bucks and I have spent 1,000 s on all the indoor crap   Try this and you will not grow indoors.. 

  52.   cow manure is good,but,yes you can use too much of it, high in nitrogen,it will stunt the growth and turn the leaves a sickly yellow/green..

  53. Nothing like good old ‘Volcanic soil’, have grown the strongest of weeds in this natural dirt..This is the most balanced soil know to man…

  54. I have an outdoor garden and would like to know what the best ratio of fertilizer is. I found miriclae grow and it is, 12-4-8
    is there a better one?

  55. Floridabadger on

    Another trick was germinating till leaves were fully exposed, then I made a hole w/finger, and put all the way so after filling hole just tops were out in hopes to keep plants low & full!! Kinda new@f9f11c2b173827b3ef69cd59107a6646:disqus  this so only time will tell!! Would enjoy corrective criticism please! From a fellow Head!!! THANX!! Happy tokin to all eho can! I.m doing all I can to get Medical cuz I could come offa Too Many pills! To pursue what I KNow is best to make me smile while being comfortable!! Happy Mothers Day to ALL Moms out there!!

  56. Floridabadger on

    I’m trying out using a cow manure type of soil! W/the knowlege + growing tomatoes & watermelons last year w/fantabulous results till sun got too hot outdoors here in FL! Now I’m utilizing a newer bulb, cfls/real curly type that is next best to sunlight! Mixed in perlite for aeration! w/rocks in bottom also! So far so good! Would like replies as to wether thid is a good Idea/plans for closet! Starting out w/bulb 24″? or so above to be pulled uo as plants grow! Also have a mirror w/Al on walls! We’ll see! Going from an old Conniseurs telling me that u can never use too much coe poop! Am looking forward to replies! Thanx!!

  57. Nathanwest66 on

    PLEASE HELP- first time grower here, i have germinated some seeds and started them out in Miracle grow soil, they are only about 5 inches right now, in 3 days im going to try a good soil mix like the one u have up above in 5 gallon pots, would they be ok to transpant them after that long from miracle grow soil to one like whats above??

  58. MeanJoeGreenDelivery on

    “8- Large bags of High quality Organic potting soil with a coco and Mycorrhizae”
    Hey guys quick question!   If I purchased Roots Organic brand potting soil what would constitute a large bag?  I am trying to buy some off amazon and I can’t figure out which poundage I am looking for.  Thanks for your help!

  59. Im doing my mixes at a large scale and just have a few questions. My plants are delicate there only about A month and there exactly 16 inches high but the best thing is because the way they were cloned and rooted for vegitation there exactly 27easy inches long so my question in how would I keep my roots from burning since there so long and healthy by the way im not going to use pots im diving a 3by3 by 4tonight foot deep hole in the ground

  60. what is the best solution for spider mites tried every remody, dont say neme oil how ever spelled but i cannot get my hands on that right now im asking the quick fix

  61. The yellowing of the leaves early on in the grow period indicates that there is a lack of nitrogen. About a month in you should have already started using nutrients.

  62. well said m8 u ask a simlpe quetion and there is always one big NOB!!!! who acts like a fucking 5year old do one grow some balls !! growers on ere not throwers!!

  63. doesnt know sht on

    ive read that it can be salt build-up, too many nutrients, too little nutrients, or just a plain unhealthy seed, im sure there can be more but thats just off the top of my head, i’d look around a bit yourself though, youtube has alot of educational clips
    good luck

  64. doesnt know sht on

    hey guys can i use “hydroponic” nutrients in a soil growed plant??
    also another question, i bought fox farms tiger bloom for my nutrients during flowering but im wondering if i fucked up and should use something like big bud powder like reffur mentioned having a higher potassium content instead of phosphorous
    i havent started my first grow yet btw, just gathering supplies and knowledge b4 i attempt so any advise appreciated muchly thanks

  65. hey ive been growing a low grade weed plant its about 4 weeks old and its still kinda a seedling and the bottom leaves are turning yellow and dying i was wondering if u could help me with my growing beacuse it looks like you know what to do!?please help?

  66. Just lookin for new knowledge first time grower at 2 and a half weeks leaves yellowing should I give them nutes already what kind

  67. @olkev Growing in soil is not that hard. You do have to be a little more patient and little screw ups that get fixed in a day using hydro can take days to fix using organic methods. If you are overly confused just start small and keep it simple. Buy a good quality organic potting mix. groworganic.com is a great place to start. They have plenty of how to videos regarding organic farming. If you need to talk to someone they have never failed to help when I have called.

    Once you have settled on the mix you will need to fertilize as the standard mixes don’t have much nutrients in them. Make a tea it is very easy to do. Just make enough for what you need and mix a new batch every third watering. You can make the tea from worm castings and bat guano in a 5 gallon bucket and water.

  68. I’m new at growing. I want to use soil and you all have made my head spin. Makes me want just to use MG. I know you all said don’t, buy good stuff. I want to make this easy. So, someone please tell me what kind is the best but don’t cost big bucks. I also have another question for all you pro’s. My grow closet is 4’x3’deep and 7’feet tall. I want to use CFL lamps. How many and what wattages. Please help this 1st grower…Thanks

  69. i just finished my first grow it went great but i had some help first i started with some great seads i orderd from everonedoesit.com.planted 5 only 1 male but the soil my friend said to use is a coco base named sunshine advanced mix#4 i never had a ph problem it is about as close to hydro u can get without the headach of the hydro system

  70. “.. bestest .. ”



  72. There is always a arrogant smart ass in the crowd who THINKS he know everything.Kind of reminds me of the spelling police nerds in the comment sections on AOL.

  73. look up black pearl soil on google dont realy know if its soil or not buy i heard about and someone told me its good shit and also told me he uses a type of root nutrient called WHTE WIDOW its powder and all you do is mix it all in with other stuff you would like to mix in and them feed the plant well peace out …..WeeDKILL420

  74. The dudes just asking a question u fucking moron, it’s fuckheads like you that give growers a bad name,


  75. smarterthanyou on

    dumbass youre supposed to use nutrient supplements via water after the first two to three weeks, not add more soil you fucking idiot

  76. Just guna start a grow mate. I have took ur advice on the soil . But when watering them do u still need neutrions in the water. And if so which? Do u change the soil after 3-4 weeks . Could u give a breif description on th stages if ya could.

  77. after 25 years of different soils i came to the correct answer about soil, go hydro you’ll love the results.

  78. fox farm ocean forest hasn’t let me down in the three years i’ve been using it. it is basically set up for vegg cycle, that’s why it needs nothing for at least 3-4 weeks. 4th to 5th week start using nutes to prepare for flowering. have mixed several variations of my own soil over 20 years and after side by side grows, found ocean forest to be as good if not better than anything. one thing is, never had problem with ph using ffof during vegg or flower. fox farm products are great, however i prefer advance nutrients for flowering stage. big bud powder is the SHIT!!!!

  79. So what do you do after 2-3 weeks? Have to use a bunch more stuff to finish the growing cycle?
    If it is so good then why will the neut only last for 2-3 weeks?

  80. Fox farm is the best dude I don’t know what you are talking about I look at this site everyday and some of the bestest articles are hailmaryjane ones you are smoking too much crack

  81. Greenies? Seriously? I unsubscribed from HMJ to get away from their juvenile BS and desperate attempts to appear relevant, very disappointed to see it getting reposted here.

    Also, if you really want to know about good soil mix for growing high-quality cannabis, one vague paragraph isn’t going to do any good. FFOF might do okay for some dude growing a single (not very healthy) plant in his closet, but there’s simply no substitute for doing a little research, and there are some pretty great resources available that are completely dedicated to growing.

  82. When my ex grew…..he would use, cow manure mixed with black dirt, bone meal, and bat (guava) poop. 5 gallons of water per day. And the holes for the plants were approx. 4X4X5′ deep.

Leave A Reply