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How To Grow Cannabis In A Small Space

Many people think they can’t grow their own cannabis plants because they don’t have enough room or limited space, but the truth is that it’s perfectly possible to develop a decent amount of bud in a small space.

Sometimes referred to as micro-growing, the art of cultivating in tiny spaces has become hugely popular in recent years, and many people now grow their own weed in empty cupboards, narrow alleyways, or miniature grow tents. No need for a massive grow room!

Which Cannabis Cultivars To Grow In A Small Space

The first thing to consider when growing cannabis in a small space is genetics. As a general rule, Sativas are lankier and more expansive than Indicas, which tend to be short and compact. Sativa types also stretch more when they start flowering, sometimes doubling in height once the light regime changes.

For this reason, it makes sense to go with Indica genetics if you have a limited amount of space. Autoflowering strains are also well adapted for micro-grows, as they typically remain relatively small.

Cultivars like Afghani #1 and Sweet Dwarf both work well for growing cannabis in a small space. However, regardless of the strain you choose to cultivate, there are several factors you’ll need to consider if real estate is at a premium.

For example, growing medium and container size can significantly impact the size of your plants. Most micro-growers tend to use soil and choose a pot based on how large they want their plants to get. Obviously, a larger pot allows for bigger roots, which translates to a beefier plant, so smaller containers are suitable for growing cannabis in a small space.

The flip side of this is that restrictive containers increase the chances of your plants becoming root-bound, so you’ll need to remain vigilant and make sure you initiate flowering before this happens (if growing a photoperiod cultivar).

Control The Small Grow Environment


Unlike in large garages where minute changes in atmospheric conditions are easily absorbed, tiny fluctuations can significantly impact growing cannabis in a small space. As with any grow, you’ll need to keep the temperature somewhere around 23 degrees Celsius at all times while also maintaining relative humidity below 75 percent, which means you’ll have to carefully monitor your environment.

Grow tents can help with this, as they are easy to regulate and ensure that plants remain in a clean, controlled space. Ensuring proper fresh airflow within the tent is the number one means of preventing major fluctuations in temperature or humidity, so installing an outtake fan is an absolute must. Luckily, these fans can be pretty compact, so they’re perfectly suited to growing cannabis in small spaces. Air circulation is key.

The next thing to consider is lighting. Unfortunately, HPS lights are pretty poorly suited to micro grows as they generate a lot of heat, which means they’re likely to raise the temperature within your tent. They also need to be placed several feet above your plants to avoid burning them, making them highly impractical if you’re trying to grow cannabis in a small space.

On the other hand, LED lights are perfect grow lights for this task, as they let off very little heat. The only downside is that they are considerably more expensive than HPS lights, but if you want to grow quality cannabis in a small space, they are well worth the investment.

Extra Tips For Growing Cannabis In Small Spaces

To get the most out of the available space, micro-growers often use training techniques such as the screen of green (SCRoG) method. This entails spreading the plant’s branches out through a mesh so that all nodes receive a good amount of light and an even canopy brimming with colas. The screen can be applied vertically or horizontally depending on the orientation of your grow space, and the technique is highly recommended for growing weed in small spaces.

Low-stress training (LST) involves bending a plant’s branches to maximise light penetration – and high-stress training (HST) techniques like topping and fimming can also be used. However, HST methods tend to create bushy plants with multiple colas, so they may not be suitable when growing cannabis in small spaces with narrow dimensions.

Defoliation is also highly effective, as it removes any excess leaves that may be taking up space, placing energy demands on your plants, or blocking out the light.

Of course, all these techniques apply to all grows, regardless of the amount of room available. However, for those intending to begin cannabis cultivation in a small space, efficient use of these methods can make a massive difference to the final yield.

Cannabis Strains for Small Grow Spaces

These 3 cannabis seeds are all available for sale right now on Seedsman. Whether you’re outdoor or indoor growing, here are some options to try

Green Crack Auto

Green Crack Auto is an excellent strain for all cannabis growers, including novices, as well as for the connoisseur cannabis consumer. This sativa-dominant high-quality auto hybrid is fast, productive, flavorsome, and imparts an energising, positive effect that is great for all social situations.

Green Crack Auto develops into small to medium-sized plants, 60 – 90 cm. tall, and is ideal for indoor and outdoor gardens. Some very generous harvests will be ready in a grow cycle of 9 – 10 weeks from seedling. Indoors it is a perfect plant to grow in a SoG (Sea of Green) set-up as it has a solid central stem that develops into one fat, dense cola. At the same time, the smaller, lower side branches can be pruned to accommodate greater planting density, thereby maximising yields.

Outdoors planted directly in the ground will grow to the upper limit in terms of height and rarely exceed 100 cm. Growers wishing for ultra-discretion can tie the main stem down and side branches as they develop to maintain an even lower profile while exposing all bud sites to sunlight.

Mamma Mia Auto

Mama Mia Auto was bred by crossing Seedsman Mama Mia with a ruderalis plant. It is a sativa/indica hybrid strain that displays good resistance to a range of plant diseases. Good yields and medicinal value add to its qualities.

Indoors Mama Mia Auto marijuana plants grow to a height of between 60 – 120 cm. depending on root space, lighting (18/20 per 24), and getting the nutrients right. In a life cycle of 70 – 75 days, it can yield harvests of 400 gr/m2. Outdoors each plant is capable of producing as much as 250 gr/plant. So, make sure you have enough space above it.

Both its scent and taste are sweet, earthy, and fruity. Its 17% THC and 0.5% CBD impart a social and active high.

Northern Lights Auto

Northern Lights Auto was created by crossing Northern Lights with a ruderalis strain to add auto-flowering properties. It is a robust and resistant indica-dominant hybrid producing high levels of THC and good yields.

As with the vast majority of auto strains, it grows well in all growing environments. Indoors it grows to 80 – 110 cm. tall with its flowering cycle is completed in 55 – 60 days, following a 2 – 4 week vegetative growth period, and producing about 500 gr/m2 when given 18/20 hours of light per 24. Outdoors plants grow a little taller, 80 – 150 cm, and produce 200 gr/plant.

It is a very straightforward cannabis grow, preferring moderate levels of slow-release fertiliser. It has good resistance to mould, plant diseases, and pests. Towards the end of its flowering stage, a range of green, blue and purple shades will both surprise and delight growers.

The scent and taste are fruity and sweet, with earthy pine and sweet ‘n’ sour plum jam coming to the fore. THC levels are very high at 23%, with a mere 0.5% CBD. The effect is one of mental relaxation coupled with a strong body high. A perfect strain for those who want to grow weed without worrying so much about the light cycle.

Cultivation information, and media is given for those of our clients who live in countries where cannabis cultivation is decriminalised or legal, or to those that operate within a licensed model. We encourage all readers to be aware of their local laws and to ensure they do not break them.

Ben Taub