How to grow a weed plant in my room?

Growing Information

An increasing number of growers buy marijuana seeds online and experiment with growing their own marijuana at home. There are many advantages to this, but a common mistake is to start too big and end up with more weed plants than you can easily manage – a nice problem to have you might think, but if you are a novice grower, it may be advisable to start very small – with just one weed plant. This blog will explain the reasons why growing one cannabis plant in your room could be the right decision for you.

The advantages of growing one weed plant indoors

The main reason is that one plant is much easier to nurture and manage when grown indoors than a dozen plants that all require the same amount of nutrients and care. You may well find that a single plant with plenty of space will grow more successfully than several plants crammed into one grow tent. Cannabis plants do require a certain amount of time and attention – pruning, watering, feeding, managing light – and, if you are a busy person, one plant is definitely going to be more straightforward to handle.

Related article: growing weed indoors for beginners

Growing cannabis for personal use is now legal in countries, but, sadly, there are still many areas where being caught with several weed plants could result in a hefty fine or even worse. You are more likely to attract the attention of neighbours, roommates and the authorities if you have lots of plants emitting pungent aromas, using lots of electricity and a forest of leafy branches. Quite simply, if you are planning an indoor stealth grow, a single plant grown in a wardrobe or similar is your best chance of success.

Finally, cost is another primary reason to consider growing one plant indoors. Apart from the fact that one seed is cheaper than half a dozen, you will also need less compost, energy and fertiliser. You will require a smaller and less expensive grow tent, and will generally be able to get away with the bare minimum in terms of setting up costs. If you don’t have a lot of gardening experience, but fancy experimenting with growing your own weed, starting with a single plant makes a lot of sense from a financial perspective. If it all goes wrong, you won’t have lost as much money as a more ambitious grow.

How much does one plant yield?

It’s impossible to provide an exact amount as there are so many variables – the strain, the growing medium, the amount and type of light, the nutrients provided, and whether you use a training method, such as ScroG (Screen of Green), which can dramatically increase yields.

Experienced indoor growers, however, can expect to grow about a gram of cannabis per watt of light. A 400-Watt HPS light, for example, roughly equates to 400 grammes of weed in your hand.

Cannabis grown in a hydroponic set up typically has slightly higher yields than weed grown in enriched soil, although there is less margin for error. Hydroponically grown cannabis can yield as much as 1.2 grammes per watt.

Related article: how much does one marijuana plant yield

What do you need to grow one cannabis plant in your room?

Let us explain what you need to grow a single weed plant in your room:

  1. Grow room
  2. Clones or cannabis seeds
  3. Cultivation method
  4. Good air circulation
  5. Suitable grow lights
  6. Nutritious diet

1. Grow room

First of all you need a place in your room. This can be the the windowsill, a small grow tent or you could use a closet.

Related article: how to grow weed in a closet

2. Clones or cannabis seeds

You can grow weed from clones, but as most growers don’t have access to clones, they buy marijuana seeds online. Recommend for beginners are autoflowering seeds. They remain small in size and are very easy to grow. 

Tip: Check all our autoflowering cannabis seeds

3. Cultivation method

There are several ways to grow your cannabis plant. Your choice will have an impact on how you should take care of your plant. The three main options are soil or potting compost; coconut fibre and hydroponics. 

If using soil, avoid using pots or buckets less than 20L as the roots of the plant will need room to grow. Coconut coir and other soil-free mixtures serve as a medium in which the roots can anchor the plant, without using actual soil.

Hydroponic growers use highly oxygenated, nutrient-enriched water. All of the plant’s nutrient requirements are supplied by water by adding a nutrient solution. Since the plant expends less energy on root growth and finding nutrients, it can use more power for vegetative growth and flowering.

4. Good air circulation

Besides the place where you will grow your weed plant you will need fans to provide air circulation because, like you, a potted plant needs fresh air to breathe. If you keep your plant locked in a mouldy closet with poor ventilation, its growth will be severely restricted. Even with sufficient lighting, water, and nutrients, the plant will be in poor condition without the right amount of fresh air. Fans are always imperative in an indoor grow space, even for a single plant. One or more strategically placed fans can provide your plant with plenty of fresh air to breathe.

The vertical height is a bit more negotiable but is still an important factor when growing marijuana indoors. You will need enough vertical space for the plant to develop vegetatively as the vegetative stage of growth determines the size of a plant when it flowers. Larger plants generally offer better yields.

Don’t despair if your vertical space is limited, however with careful cultivation, pruning and training, you can grow weed indoors, even with only a few feet of vertical space.

5. Grow lights

There are many possibilities when it comes to lighting for growing cannabis indoors. The main types of grow lights are high-pressure sodium (HPS), metal halides (MH), light-emitting diodes (LEDs) and compact fluorescent lamps (CFL).

Smaller spaces, especially those where air circulation is a factor, can quickly get too hot with the presence of poor grow light. This means that if you have minimal space, you may want to avoid high-intensity lights such as HPS and MH. To keep the temperature of the grow room under control, consider LED or CFL lighting, as these work well, and consume less energy and heat compared to other systems.

If power consumption is an issue, LEDs are the best choice. They require less electricity than other types of lighting. However, when the initial cost is a factor, many beginners choose CFL lighting because it is cheaper than LED.

Related article: Growing weed with LED

6. Nutritious diet

There are two main types of fertilisers (nutrients) used to grow cannabis: organic and chemical. Both varieties contain the essential nutrients nitrogen (N), potassium (P) and phosphorus (K).

The best nutrients for your cannabis depend in part on the type of soil or growing medium you use. The kind of food also has an impact on the acidity of the earth, which makes the pH test important.

Tips for growing a cannabis plant in your room

If growing a single plant, we recommend choosing a high yielding strain, such as:

  1. Blue Dream
  2. Girl Scout Cookies auto
  3. Big Bud

You might also prefer to choose a variety with predominantly Indica characteristics. Indicas tend to grow into bushy compact plants, compared to their leggier Sativa counterparts.

Autoflowers are ideal for beginners as they start to flower automatically, so you don’t need to worry about switching light cycles. However, when your plant is in the dark phase, it is essential to ensure that absolutely no light can seep into the grow tent. Exposure to light during periods of dark could confuse the plant, affecting its growth and could even turn it into a hermaphrodite!

Do your research before you begin. Many strains of weed have different growing preferences as well as varying flavours and effects of the end product. Spend some time reading about different varieties and look forward to enjoying the fruits of your labours!