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Growing

Choosing the Right Container for Your Cannabis Plant

March 13, 2018
Setting up a cannabis garden is a game of choices. Around every corner, there are decisions that impact the health and prosperity of your cannabis plants. Choosing the right container is one of the more important decisions a grower must make.

There are many options available when it comes to choosing the right pot, and making a smart selection will depend on a few questions:

  • Which pot will best serve the needs of your plant?
  • How much space do you have available in your garden?
  • How much time do you have available for maintenance?

Answering these three questions will help guide you to the perfect pot, so let’s take a look at what factors you should consider and the options available to you.

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How to grow marijuana indoors: A beginner’s guide

Understanding Root Development

When it comes to pots, your cannabis wants one thing and one thing only: a safe, healthy place for root development. Without healthy roots, your cannabis will never thrive. They’re in charge of water retention, nutrient absorption, anchoring the plant, as well as facilitating vegetative growth. All of these functions must be considered when choosing a container.

For a root system to develop and thrive, they will need the following:

  • Access to water: Water retention is paramount for healthy plants. Without it, your cannabis will wither and die. Although growing medium plays a big role in this matter, housing your plants in the right container can also help. Give your roots access to proper drainage to mitigate damage.
  • Access to oxygen: Plant roots require oxygen to function properly. Knowing this, choose a container that facilitates enough oxygen for root development without overexposing them to the elements. Many container varieties offer increased oxygen exposure to the roots though various styles of perforation.
  • Access to nutrients: Roots require optimal conditions for nutrient absorption to occur. This includes pH balance, optimal temperatures, and nutrient availability.

Related

Diagnosing Cannabis Nutrient Deficiencies in Sick Plants

Common Pots Used for Cannabis Growing

Garden centers and grow supply chains offer different pots that vary by material composition, shape, size, and perforation style. Here is short list of popular container varieties offered.

Traditional Plastic Container 

(Turnervisual/iStock)

Standard plastic containers are a popular option for growers operating on a budget. These pots are inexpensive, but still provide the essentials for your plants.

Pros: 

  • Low overhead costs
  • Solid drainage (plus it’s easy to add more holes)
  • Transplanting is easy and inexpensive

Cons: 

  • Inability to protect root systems from temperature fluctuations
  • Lack of durability which can cause cracks and structural damage over time
  • May have airflow issues depending on the grow medium

Related

Basic Cannabis Growing Setups for Cultivators With Tight Budgets

Ceramic Containers

(sanddebeautheil/iStock)

Otherwise known as terra-cotta, ceramic containers offer a unique set of benefits to growers in hot climates.

Pros:

  • Absorbs moisture and retains lower temperatures during hotter days
  • Heavy weight helps to anchor larger plants

Cons:

  • Less than optimal drainage; drilling holes into clay pots is possible, but requires special tools and is more labor-intensive
  • Heavy weight makes it difficult to transport plants

Fabric Containers

(Juanmonino/iStock)

A relatively new innovation in container gardening, fabric pots offer many benefits when it comes to building healthy root systems. Roots in fabric pots grow to the outer edges and attempt to bypass the porous fabric wall. Instead, they are cut back, allowing new growth to occur. This process, called “air-pruning,” results in denser root composition which promotes healthy growth and development.

Pros:

  • Promotes dense, healthy root systems
  • Increased airflow to the roots
  • Excellent drainage ideal for carefully-maintained gardens

Cons:

  • Requires more attention and maintenance as the pots dry out quickly (Note: you can use larger pots to help slow dry-out.)
  • Flimsy structure can make plant support challenging

Related

How to Support Your Cannabis Garden With Trellising

Air Pots  

(Courtesy of Air Pot)

Air pots play on the same air pruning technique as fabric pots, only these tend to be sturdier as they are manufactured using harder materials.

Pros:

  • All-over perforation allows them to catch and prune roots
  • Excellent drainage and airflow

Cons:

  • Require more watering and care than traditional containers
  • Tend to be expensive due to materials and complex design

Related

How to Prevent Root Rot, Mildew, and Leaf Septoria on Cannabis Plants

Other Pot Varieties

There are several more options to choose from aside from the four container types mentioned. These include hydroponic setups like rockwool cubes, encased flood and drain basins, and various bucket systems.

For soil growing, many growers opt for larger grow medium reservoirs such as no-till trays. These systems are intended for plants to grow in minimally tampered environments that promote microbiological ecosystems to develop around the root balls. While only loosely regarded as container options, these systems work very well for their intended purposes, and can produce impressive results if used properly.

Water Catching and Maintenance  

One commonly overlooked factor in container gardening is water movement. Containers must offer adequate drainage so that water may pass though the root system effectively.

For water catching, containers are often paired with saucers or trays designed to catch runoff as it passes through their perforated holes. This moisture must be collected after every watering. Many growers opt for vacuums or automated systems to collect water, or you can incorporate larger drainage trays designed to catch runoff from multiple containers. Water in these systems collect in a basin and are typically drained into a collection device.

Related

How to Grow Hydroponic Cannabis

Choosing a container system is often a decision based on maintenance. Certain containers may require less maintenance by allowing for fewer waterings. Other varieties may require more daily maintenance by requiring extra monitoring or watering. This will come down to how much time you’re willing to spend in your garden daily.

The final element to consider with container planting is transplanting. Stay tuned for the second part in this series which covers when to transplant your cannabis, choosing the right container size when upgrading pots, as well as transplanting best practices.

Lead Image by Rick_Thompson/iStock

Patrick Bennett's Bio Image

Patrick Bennett

Patrick lives with his wife and daughter in Denver, where he spends his time writing, photographing, and creating content for the cannabis community.

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2 part series

  • Jennifer Lee

    This is a great intro but I wish it were a bit more in depth on some of the ‘alternative’ choices. How they impact yield could potentially offset the cost of the container, and there actually are some cost effective options available.

    Also, the environment you are using the containers can have a major impact on things such as water consumption vs. efficiency- the same could be said for nutrients.

    When does part 2 come out? I’d love to stay up to date on this one.

  • PandR Wright

    I have a question…..how deep does the plant need to be when in transplant?

    • carl

      The plant should be at approximately the same level when you transplant.
      You can err on the side of a little deeper since the medium you’re
      transplanting into may sometimes settle. If it’s too shallow though you
      can end up with exposed roots which will no longer be able to provide
      nutrients to the plant in addition to making the plant more vulnerable
      to certain pests and disease.

  • Yet again, a Leafly article that’s long on fluff and short on substance. One key omission: how BIG does the pot need to be for a seedling, then how big of a pot do we need to transplant the little plant into? Do we need a third pot for an intermediate stage? Why or why not?

    • carl

      They could easily write a whole other article on the subject of transplanting. I mean you absolutely could start seedlings in a huge 400gal pot which is good for the roots as they will never run into a barrier or be disturbed by the process of transplanting. The downside is that it requires a much higher initial investment in soil and there is no guarantee the plant will grow to the capacity of the pot you choose or perhaps more importantly that it will end up being a female or survive to harvest for that matter. Watering larger pots is also more time-consuming and expensive, especially when you consider that most of that water will evaporate without feeding the plant and if you’re using liquid fertilizers this becomes even more needlessly expensive. My recommendation is that you start seeds on a wet paper towel and move them from there to dixie cups, to solo cups, and then something in the range of gallons. Play it by ear from there. Transplanting should always be done in the early morning or more preferably the late evening and accompanied by a thorough watering, otherwise your babies will wilt and die in the afternoon sun. If you’re looking for my professional opinion on container choice, go with bags. They are much more durable and lightweight. We only ever had one “break” on us and that was because it got mauled by a bear who wanted to eat the molasses we were using as fertilizer.

      • Rachel-Anne Quilliams

        I find the best and most effective is to put seeds in a cup of water and the tend to germinate or break the shell of the seed and shine through within 24 -48 hours. However light is need, I place it near a window sil. The I transplant them into a smaller pot. The grow very fast this way. But also putting them in soil with lots of water works to.

        Idk my pot plants love love love the heart and sun, the more the better.

        I find that planting them from seed in a pot and let them germinate that way makes the plant more stable and it’s honestly the most natural way.

    • Niklas Hultkrantz

      Hi I agree the thing I would like to know was left out. I did find that for me the best result I got was from growing in polyethylene planting bags. That wasn’t even mentioned.

      • Rachel-Anne Quilliams

        Does polyethylene have a chemical that soaks into the plant?

    • Stanthe man

      Don’t know if you will read this, but for anybody growing a plant: I start in a 12 oz. cup, and trans plant into the outdoors as soon as the first leaves pop out. I put chicken wire around the baby plants to protect from baby bunnies. I put 4 inch field fence around them to protect from deer at about 3 weeks. Happy growing.

  • Katie Patterson

    Is a 3 gallon cloth smart-pot big enough for an adult cannabis plant? Or should I go with 5 gal?

    • Tony Wilford

      it all depends on how much product you want to harvest. The bigger the container, the more root growth which equals a bigger plant. A bigger plant means bigger and/or more, buds. Having said that, generally most indoor growers go with 5 or 10 gallon pots.The way I have done it is, I start out with red solo cups. I move the plants into 1 Gallon smart pots when they are around 3-4 inches tall. Then, when the plants are around 1 foot tall, I move them into their final pot. Usually 5 or 10 gallon.

  • Rachel-Anne Quilliams

    Is it really that hard to grow plants outside ? I just give my plants some peat most and natural compost nutrients and they grow fine. I’m lucky in Manitoba we have daylight right now from about 430/5 am to 1030 pm. So we have plenty of light.

    But I wonder marijuana should be able to grow naturally you would think, without all the hassle. I mean at one time (and still does in some places in the world) it grew naturally. Without spending all this money on extras. I’ve planted in Mother Earth and they always grow. Lighting seems to be important.

  • Douglas

    I have just planted the seeds in a five gallon pot 4-6 months later depending on the strain 1/4 to 3/4s of a pound per plant. I have transplanted some and they started flowering at 1 -3 feet and served as an early harvest. Only thing is bud worms that are easy to eliminate with BT and careful inspection.