5 Tips on Choosing Pots for Your Cannabis Plants
Cannabis is becoming legal throughout the United States, whether for medical or recreational purposes. Those in medical states may be able to grow their own marijuana, depending on the specific legislation. If you live far away from a dispensary, then growing can be an excellent option; plus, it’s a rewarding task!
However, the task of growing cannabis can be daunting for novice cultivators. Marijuana can be quite particular about its growing environment, so you need to read up on the proper techniques. It can even be helpful to find growing guides for specific strains!
In this generalized guide, we will explain one of the fundamentals of growing pot: Choosing a pot to grow it in! Here are our top five tips for choosing the right container for your cannabis.
1. Know the Types of Pots You Can Use
One of the first things to know is that there are different kinds of pots used for growing. If you have a green thumb and already garden, you’ll probably have some handy containers lying around just waiting to be put to use.
Here is a brief breakdown of the most common pots used in cannabis growing:
- Plastic Container: A standard plastic pot used in planting. They are inexpensive and provide good drainage, but are not very durable.
- Ceramic Container: Terracotta plant pots are a familiar sight for many gardeners. They’re great for temperature regulation, but not so good for drainage.
- Fabric Containers: Fabric pots have a thick fabric covering; they support soil and plants surprisingly well. Fabric containers have excellent airflow and drainage, but can be flimsier than other containers.
- Air Pots: Similarly to fabric containers, air pots provide incredible airflow via holes throughout the pot. However, they may be expensive and lead to an increase in watering.
Of course, these are not the only pots available. There are other containers you can use, but most growers use the above.
You need to consider things like cost and the size of your grow room, as well as how many plants you are growing. Even with limited space and a reasonably low budget, you can make any of these pots work for you; but you may need to adapt the growing process depending on the qualities of your container.
2. Understand Growing Mediums
Another vital factor in choosing a container is thinking about which growing medium you will be using.
When you first start growing your plants, you’ll need to choose what growing medium you’ll use. No matter what, your plants will require access to water, oxygen, and nutrients. Typically, growers use a soil medium. Plants can acquire water and nutrients from the soil, as well as oxygen depending on how good the airflow of the container is.
Other growers use hydroponics, which means growing in water with an alternative medium such as rock wool or coco coir.
Different containers are better for different growing mediums. Air pots are ideal for hydroponics, for example. As long as your roots are developing healthily, then you’re doing something right!
3. Finding the Right Sized Container
Importantly, you need to make sure that your plants have a container that is the right size. Otherwise, they won’t be able to draw the right amounts of oxygen, water, and nutrients from the soil.
A seedling will only need a very small pot. Some growers even use a solo cup, to begin with! As it grows, you will need to transplant it to larger pots (more on this in the next section).
A good rule of thumb is to use two gallons for every 12” of height. You will need to research the strain you’re growing to find out what containers you will need. Here is a rough guide to the size you will require:
- 12” plant: 2-3 gallons
- 24” plant: 3-5 gallons
- 36” plant: 6-8 gallons
- 48″ plant: 8-10 gallon
- 60″ plant: 12+ gallons
By the way, fabric pots may need to be twice the usual size due to how quickly they dry out.
4. Transplant When Needed
Eventually, your young cannabis plant will outgrow its seedling pot and will need to be transferred (transplanted) into a larger container. When the plant’s leaves reach the edge of the pot, it’s time to move the plant.
A few days before it’s time to transplant, avoid watering your plants. This helps the soil to stick better when removing it.
Here are our top tips for transplanting:
- Before you begin, make sure you wash your hands and wear gloves, so you don’t contaminate the roots – they’re really sensitive.
- Fill the new container with the growing medium and transfer the plant from one pot to another.
- Be careful not to damage the roots, as this could shock the plant and may kill it.
- Avoid intense light, as this may also shock the plant.
- The first transplant is the one most likely to cause shock, so be extra careful!
- Water the soil after transplanting.
- Do not transplant any plant after it has started flowering.
5. Make Sure You Catch Water Run-off!
When growing cannabis, you’re bound to get some water runoff. As the water moves through the soil, it may pool at the bottom unless you have adequate drainage. Most plant pots have holes in the bottom for this purpose – but you don’t want water ending up all over the floor!
Water needs to be collected after every watering, so you need to find a simple and effective water collection system. This might be easier than you think!
All you need is a saucer or a tray. Saucers are ideal for just one or two plants, but you need to remember to empty the water often. Trays are better for lots of plants as they can collect water from multiple pots at once.
Another benefit to trays is that you can use a water transfer pump to effectively move the water out of the tray. This removes a lot of work for you!
Ultimately, whichever tool you choose is dependent on how many plants you are growing at any one time.
Final Thoughts on Choosing Pots for Your Cannabis Plants
Choosing the right container for your cannabis plants is vital, but it doesn’t have to be complicated. In fact, it’s pretty straightforward to find ideal pots for your plants. You need to consider critical factors such as how many plants you’re growing and what your growing area looks like. Different containers work for different cultivators, and so there isn’t any one right answer.
In the main, you need to ensure that the container is the correct size and provides adequate drainage and airflow. Once you have that covered, you should be good to go!
Any questions? Leave them below in the comments, and a member of our team or our community will get back to you with advice.
If you're embarking on your first cannabis-growing adventure, you might be wondering which pots are best for your plants. Here's our complete guide.
What’s the Best Pot? Containers Explained
Table of Contents
Which growing container works best for cannabis? What is it that makes some containers better than others?
The answers are contained in the roots of your cannabis plants. The idea behind choosing the right container is to pick one that is going to provide the best possible environment for your cannabis roots. Your roots are like the “heart” of your of your cannabis plant. They need to be healthy for your plant to get nutrients and grow.
What do marijuana roots want?
Happy cannabis roots want…
Moist at all times – roots die when they dry out! Good watering practices combined with a great growing medium will make sure your roots never dry out
Oxygen – your roots “breathe” oxygen, so one of the best things you can do for them is make sure they always have access to plenty of oxygen – more oxygen to the roots = faster growth
Nutrients – your roots “find” nutrients at the roots, and then deliver them to the rest of the plant, so making sure your plant has easy access to nutrients will help your plants thrive and make buds
pH Management – Some nutrients are sensitive to the pH of their environment. When exposed to the wrong pH, the molecular form of these nutrients actually changes. Nutrients in the wrong chemical form become unavailable to your plant roots. Exposing nutrients to the correct pH reverts them back to a form your roots can take in.
Bottled Cannabis Nutrients
Managing pH is especially important when using bottled nutrients.
Using bottled nutrients gets the nutrients to your plant faster (which equals faster growth), but it also means you are in charge of managing the pH.
These systems deliver nutrients directly to the plant roots in their simplest form, but there is no “middle man” between you and the plant roots, leaving you in charge.
So if you’re using bottle nutrients, make sure you manage your pH!
Amended & Composted Soil
When starting your cannabis grow with properly amended and composted soil, pH isn’t as important for you to manage. Instead of managing pH, you need to manage and care for the bacteria and microorganisms in the soil. In a proper composted soil setup, the microorganisms deliver nutrients to your roots in the right form. They become the “middle man.”
Types of Containers
There are many kinds of popular rowing containers for cannabis gardens…
Standard plant container with saucer
Here’s a breakdown of those different container options…
Standard plant container with saucer
This is a container with a hole at the bottom for drainage, plus a saucer to catch the water.
Tried and true method
Easy to find at any gardening store
Saucer captures runoff water for easy disposal
Smart pots (fabric containers)
More oxygen to the roots
Prevents plants from getting “root-bound” via “air-pruning” from the sides
Since growing medium dries out from the sides, smart pots make it difficult to overwater your plants, but that also means you will end up watering more often
Since smart pots dry out faster than regular cannabis containers, you should get double the size as your normally would, and it’s recommended your final size should be at least a 5-gallon container (anything smaller than that dries out in just a day or two!). So if you would normally get a 2-gallon container, you’d want to get a 5-gallon smart pot.
Need an extra large saucer or a tray to capture runoff water – smart pots don’t come with a saucer or tray and they seep out water from the sides
More oxygen to the roots
Helps prevent plants from getting “root-bound” via “air-pruning” from the sides
Since growing medium dries out from the sides, air pots make it difficult to overwater your plants, but that also means you will end up watering more often
Although water seeps out the sides when watering, air pots are tall and thin so you can use a regular size saucer for each container
Like a regular plant container except instead of having drainage holes out the bottom, they are located near the bottom on the sides
This leaves a small pool of water in the bottom of the container after watering
Need to water less often with hempy buckets, which is a great advantage when growing larger plants that drink a lot
Can sometimes lead to root or nutrient problems since stagnant water can sit at the bottom of the container and any nutrient buildup never gets rinsed out
How to Catch Water Runoff
The two most popular ways of capturing runoff water in small containers are…
Individual saucers for each container
Trays to catch runoff from several containers
Most regular plant containers come with a matching saucer. These are placed under the plant and catch the runoff water for each individual plant.
When using a container that lets air in through the sides (such as a smart pot or air pot), you will need a larger than normal saucer to capture all the runoff water, since water will be seeping down the sides of the container.
One of the problems with saucers is you usually remove them from under the plants to empty the runoff water (always remove runoff – never let it sit so it’s seeped back up into the growing medium!). This is easy with just a few plants, but can become a problem when growing with a lot of plants in a small space. It can be difficult to get to the saucers in the back after the grow space has been filled up with plants.
If you’re having trouble emptying out all your plant saucers, you may want to consider an alternative to regular saucers…
If you want to capture the water from a lot of plants in one space, I recommend using a tray set one a slight incline, so the part of the tray furthest away from you is raised slightly off the ground.. With even a tiny incline, the runoff water will pool at the front of the tray, and a wet vac can be used to capture all the water from the plants. This can be a lot easier than emptying saucers, depending on your setup.
As a bonus to using a tray, you won’t have to move your plants around as much, which results in better and faster growth. Plants don’t like being moved around if you can help it.
How to pick up the water from your tray?
- Wet/Dry vacuum
- Water transfer pump
I found the “Bucket Head” attachment at Home Depot which costs about $25 and can be attached to any standard bucket, turning it into an ultra-cheap wet/dry vacuum.
Which Size Container?
Final Size Container for Desired Plant Size – General guide
When choosing the size of your containers, you must think about the final size of your plant. Bigger plants will need bigger containers, while smaller plants grow best in a relatively small container. You need to match the size of your plant with the size of your container.
A general guide is to have up to 2 gallons per 12″ of height. This isn’t perfect, since plants often grow differently, and some plants are short and wide instead of tall, but this is a good rule of thumb.
So if your final (desired) plant size is…
2-3 gallon container
3-5 gallon container
6-8 gallon container
8-10 gallon container
12+ gallon container
Lots of different types of containers will work for growing cannabis as long as it has good drainage holes out the bottom
If you’re using a Smart Pot (fabric pot) or any container that lets in oxygen from the sides, you’ll get faster growth than a hard-sided container. However you will also need to water your plants more often since the soil will dry out more quickly.
Therefore it’s recommended to get twice the normal size if you get fabric pots so the soil doesn’t dry out as fast.
Get twice the normal size if the container lets oxygen in from the sides (like fabric pots and air pots)
Which size container should you start with? Start Small
To start, your plants will do best in a relatively small container. This helps prevent the chances of overwatering (since the container is so small) and since a small container dries out quickly, it will deliver more oxygen to the roots.
Many growers start their plants in a solo cup or a 1-gallon pot.
As mentioned earlier, some growers start their marijuana plants in their final container, which is usually larger than a 1-gallon pot. Starting in a big container isn’t as simple as starting with a small container, and can cause slower growth at first, but here’s you can take to get a seedling to grow quickly in a large container.
Once the leaves reach the edges of the solo cup it’s time to transfer to a larger container. These seedlings are getting close!
How to water seedlings or clones in a too-big container
When starting seedlings in a big container (bigger than 2-gallon), it’s important to slowly give just a little bit of water at a time until your seedling “grows into” its pot. This prevents overwatering, which slows down seedling growth.
By watering the right amount in the seedling stage, you can speed up growth significantly, especially during that first week or two.
For new seedlings you should give water in a small circle around the plant instead of saturating the whole container.
Don’t give water again until the top inch of potting mix is dry to the touch (which should be less than a few days if you did your job right). This makes sure your seedlings get a perfect mix of air and water so it grows as fast as possible.
Make sure to give water slowly in a small circle around seedlings until you get runoff water out the bottom of the container. This makes sure that water is getting to your plant’s roots but isn’t over-saturating the container.
After plant has started to “grow into” it’s container, the top inch of potting mix will start drying out quickly (less than a few days). At this point, you can start normal cannabis watering practices which means you saturate the whole growing medium until you get about 20% runoff water
How to water cannabis seedlings or clones in a too-big container
This is for when you’ve just planted your cannabis seeds or clones in a too-big container. By giving your young plants less water at a time following the steps below, you prevent overwatering which can slow down seedling or clone growth in a too-big container.
- Pour water slowly in a small circle around the base of the seedling (I first pour my water into a solo cup so that it’s easy to pour water around each plant).
- The circle should be
2 inches in every direction from the base of your seedling (or if your seedlings are bigger, about the width of the leaves).
Regular Watering Stage
Once your marijuana plants have established healthy root systems that can support the size of your container, you can start watering as normal.
- Once the top of the growing medium is drying out quickly, in less than than 2-3 days, you’re past the beginning stage.
- Switch to normal watering practices. This means that you are watering the entire container until you get 20% runoff every time. Then don’t water again until the top inch (up to your first knuckle) is starting to feel dry to the touch.
Important: Always wait until the top inch (up to your first knuckle) is starting to feel dry to the touch before watering your plant again. This prevents both overwatering and fungus gnats 🙂
Transplanting for faster growth
Transplanting means that you start your plants in a relatively small container, and then transplant the plants as needed so that their roots never run out of room.
Transplanting will provide your plants with faster growth if done right. This is because transplanting allows you to set up an environment where your roots are getting access to plenty of water and air. However, transplanting can stress your plants (and slow down growth) if not done properly. When transplanting, it’s important to carefully move plants so that their roots are not disrupted in any way. This means moving plants before they get root-bound, and creating a hole in the potting mix of their new container so the plants can be placed right in without disturbing the roots.
If you plan on starting your plants in a small solo cup and transplanting your plants to bigger containers as needed, take a look at this transplanting guide.
While transplanting makes it easier to give your young plants access to plenty of water and air, it can stress the plants if not done right, and it can also be too much work for some growers. So many growers start their plant in it’s final container.
When seedlings or clones are started in a large container, it can be difficult to get enough air to the roots until the plant is bigger and drinking a lot. Thisis because when the potting mix gets soaked, the seedling roots just won’t be able to drink it fast enough, and the roots will end up sitting in stagnant water with very little acces to oxygen. The growing medium has to dry out on it’s own, which can take a while, and your plant will be droopy and overwatered until the roots start getting access to air again.
Some growers start their seedlings or clones in a bigger pot, or even the final container they plan to use. While this can slow down growth of young seedlings, you can minimize this effect by watering young plants correctly when they’re started in a too-big container.
Here’s a very quick breakdown of some of the most common cannabis growing mediums for a hand-watered grow. This is not a comprehensive list, but should give you a place to start your research. Each of these different growing mediums have pros and cons.
Soilless (coco coir, perlite, vermiculite, etc)
Easy to find at any gardening store
You can start with nutrient-rich soil and transplant several times throughout the grow to give your plant what it needs after it’s used up all the nutrients in the soil in it’s current container. If you choose not to continue transplanting to give cannabis more nutrients, you will need to use cannabis nutrients to make sure plants are getting what they need
You will need to manage and adjust pH for a soil grow, especially if using bottled cannabis nutrients
Composted Soil – learn about composting your own soil
You will need to amend and compost your soil to use this method, which can take a lot of time, or buy amended and composted soil from a quality source
When done right, there’s no need for bottled nutrients or adjusting pH
Many growers claim that composted organic soil provides the best bud taste and smell
Soilless Potting Mix – (coco coir, perlite, vermiculite, etc)
Faster growth than growing in soil
Starting at the seedling stage, you will need to use cannabis nutrients made for hydro, since soilless mediums do not come with nutrients
Managing and adjusting pH is crucial to success in a soilless growing medium
Less likely to get pests or bugs
How much grow medium to get?
In the USA, a “3-gallon” plant container usually holds less than 3 gallons (same with 1-gallon, 2-gallon, 5-gallon, etc.). It’s a weird convention in the USA which means a direct conversion between listed gallons and gallons of soil (or conversion to liters) isn’t accurate. A “trade” gallon holds about 3/4 of a “real” gallon. This makes it easy to buy a lot of extra grow medium. To make things more confusing, in the USA not every 3-gallon pot actually holds the same amount of grow medium (it’s not totally standardized). Additionally, smaller companies often give the actual amount. Other factors change how much grow medium you need, including how high you fill the pot and how much it gets compacted. When in doubt, get the listed amount and you’ll always end up with enough or extra grow medium.
What’s the Best Pot? Containers Explained Table of Contents Which growing container works best for cannabis? What is it that makes some containers better than others? The answers are