What Types of Soil Should You Use When Growing Marijuana Plants?

Ignore whoever told you plants don’t need food. Maybe not during the first 12 days, but after they germinate, like all living plants, your cannabis will need food to live. They may have been referring to using potting soil with added nutrients and fertilizer. Adding more fertilizer to potting soil already saturated with nutrients will fry your plants.

The best potting soils have a mixture of compost and peat moss, with seabird/bat guano, seaweed/kelp, worm castings and a bit of hydrated lime and perlite. Some growers like to add lots of perlite but you should never use more than 15% in my opinion. Soil with these organic nutrients doesn’t need any additional nutrients for the first 4 weeks or so. Then it will be time to add small amounts of nutrients to the water when you water your plants.

For a beginner, I’d recommend FoxFarm nutrients. You’ll need one type for the vegetative stage and another kind for the flowering stage.

Top quality potting soil is expensive. Fox Farms Ocean, Forest, Black Gold Potting Soil start at $10.00/bag. Luckily it is very cost effective. Your plants will grow faster, be a lot healthier, and you’ll have more buds to harvest.

Growing cannabis in soil common questions

How do I know which dirt is perfect for me to buy?

which dirt is perfect for me to buy

Do some reading on the subject, marijuana requires certain elements in order to grow well, so the better soil mix you buy, the better growth and yield you will have in the end. When buying soil, you really get what you pay for, trust me.

My soil cracks into chunks when it gets dry and my plants aren’t growing much at all. What’s wrong?

soil cracks into chunks when it gets dry

Your soil is too tightly packed to permit the roots to grow and distribute. Compacted soil will choke a plant and stunt the development. Remove your plant, add some perlite or moss or other additive to the soil mixture, then transplant. It should perk up and begin growing in a day or two.

I just planted five seeds, but I have 8 sprouts in my cups. How can this happen?

Chances are you used old soil or (cheap) affordable soil. Pull the ‘weeds’ as soon as possible, but make sure you don’t pull your bud seedlings out by mistake!

I started 2 other grows using this soil, but my other plants all died. Can I still use this?

2 other grows using this soil

That depends on why they died. If they were good seeds and you gave them great care, then I believe your soil has issues or is contaminated. The best thing is to dispose of it and purchase new, better grade of dirt.

Help! My dirt is filled with brown bugs! Can my two-week-old plant be saved?

My dirt is filled with brown bug

That sounds like a terrible infestation. If the plant looks healthy, spray it down with a soap mixture, then remove it from the pot, gently shake the dirt out of the roots, and transplant it into fresh soil, after you wash your container well. Throw all of the old dirt out, it can’t be used for anything.

My soil was EXPENSIVE, why cannot I reuse it?

Reusing soil is a matter for much debate. Some growers do, some don’t. Some will include fertilizer and nutrients, then flush it out and allow it to sit between grows. Some use the same soil over and over with great results, while others throw it on the compost heap as soon as the crops are cut. I would think, the better the soil, to begin with, the more reusable it would be.

I saw four distinct brands of dirt in the garden center today. How do I tell which is best?

four distinct brands of dirt

Compare the ingredients in each bag, then go with the one that has the ingredients you want inside. If it doesn’t satisfy you, you can always change to a different brand.

I planted my seeds in plain soil. What do I do?

planted my seeds in plain soil

Purchase a bag of soil at the local shop and transplant your seedlings, as soon as possible.

What type of cup do I start my seeds in? How much dirt? How much water?

Any small container will do – make sure it is 3-4 inches deep and has drainage holes in the bottom. Fill it to ½ inch on the top with dirt. Water with half to one ounce of water daily until it sprouts.

Can I keep my seeds on the stove to germinate?

Yes. Your germinating seeds have to be kept nice and warm and be sure the soil stays moist too.

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