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How to Grow Weed Indoors for Beginners [Follow-Along Guide]

I’m here to tell you that growing weed indoors step-by-step is easy. Just follow along.

Because it’s the first choice of thousands of beginner growers, I’ve decided to put together the most comprehensive soil weed growing guide on the internet.

In this guide, we will go through the whole growing process, from choosing the seeds and soil to harvesting and curing the buds. Hopefully, by the end of this guide your cannabis growing knowledge will grow as much as your plant.

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Preparation stage

The first week (or week 0 as I like to call it) is when you prepare your grow.

It doesn’t necessarily have to be a whole week, however it can often be longer.

You might think:

“So, it’s not a week at all?”

And you’d be right.

You won’t be doing any growing this week as you can’t grow plants without the seeds first.

Week 0 is focused around finding the best soil, seeds, lights and setting up your growing tent.

Even if you are growing hydroponic marijuana you have to do the prep stage, which might be even longer for hydroponic setups.

Seeds

For this indoor soil growing guide we will use one of the most popular strains ever: White Widow.

But, we won’t use just any White Widow.

For this occasion we will use the autoflowering version of this plant.

Well, for a few simple reasons:

Autoflowering plants are smaller, but they don’t cut down on the yield, they are easier to grow, and they grow faster than regular plants.

You will want only feminized seeds for this grow as male plants do not grow flowers.

“Your plant is only as good as your soil.”

I find this to be one of the biggest truths of growing cannabis.

Beginner growers often experience problems with their soil, such as malnutrition and over-watering.

Both of these will have a long term effect on your plant if not dealt with in the quickest manner.

This is not to say that cannabis won’t grow in slightly bad conditions, far from that.

It’s called “weed” for a reason. It will grow even in sub-par conditions, however the end result might not be what you hoped for.

So, in order to avoid any confusion, do your best to get the perfect soil, and if you fail, you can still make it up by adding nutrients.

Feel free to buy any of the branded soil mixes, except for those that are labeled “extended release”as they will release nitrogen to your plant roots for up to 6 months, meaning that you will have n0 control over the pH levels of your soil.

The best option out there for first-time growers is “Super Soil”, a special mix of soil that can be found in stores. KindSoil is one of the more popular brands of Super Soil.

With any Super Soil mix you won’t have to add any nutrients, as the mix comes premade, so water will be the only thing you add to it—by watering the plants.

Fun fact:

Did you know that earthworms in soil can increase the yield up to 75%? According to scientists from Netherlands, earthworms might be one of the most important parts of a soil-based grow.

However, this study was done on wheat plants so I wouldn’t suggest you throwing earthworms in the mix if you haven’t had at least a dozen successful grows.

Lighting setup

Lights are super important for growing cannabis and insufficient lighting is one of the biggest reasons why many indoor grows fail.

Lighting depends totally on the size of your grow.

Basically there are 2 most common options for lighting:

CFLs give off more heat than LEDs and are better suited for growing in small spaces, such as tents.

Their downside is that they tend to spend more energy and you will have to readjust them more often than LEDs.

So, my end recommendation is this: if you have room for LEDs and you are willing to go through the hustle of setting up LEDs, be my guest.

For a small first time grow, I would suggest getting a CFL setup with lights up to 300W.

Keeping CFLs close to the plants will bring in the best yields and ensure the biggest plant growth.

The tent

Growing tents are perfect for those that tend to grow in their garage or colder areas of the house, as the tent holds the warmth within itself, helping plants get bigger as soon as possible.

If you plan on growing marijuana in a closet, or a similar closed space that doesn’t let too much heat out, I would suggest that you approach it with caution.

Either way, the most important thing is to keep the temperature at a constant 25°C (77℉).

In case you do go with a tent, you will have to extract the air from the tent, which is removed using a fan that sucks the air out through tubes.

Most modern tents have a carbon filter which prevents the smell of weed leaving the tent, so keep that in mind when shopping for one.

If you still think you can make do without a tent, then get ready to spend some money on fans and/or ventilation systems.

Most modern air extractor fans include temperature and moisture controllers, which will come very handy when calculating your VPD (we’ll get to that later), so I strongly suggest you get one of those.

Light schedule for growing weed indoors

Light periods for autoflowering plants are really easy to grasp:

All you have to do is keep the light turned on.

Like, all the time.

I am not joking when I say that you should keep the lights on 24/7.

Giving 24 hours of light is crucial when growing autoflowering plants, as it may give them the best chance to grow bigger in the vegetative stage and then eventually flower when their time comes.

Autoflowering plants do not need darkness.

Autoflowering plants are not dependent on changes in the light cycle to commence flowering.

This is why they can be grown using a light cycle of anything from 16 to 24 hours daily.

This is also what makes them perfect for first time growers as light periods are one less thing to worry about.

Germination & seedling stage

Time to put those girls into action!

But first, some more prep.

VPD for weed

Creating the perfect environment for your plants doesn’t necessarily end with buying all the right gear.

You will have to know how to properly set it up, and more importantly, how to make the perfect atmosphere for your plants to grow to their potential.

Dehumidifiers decrease environmental moisture and release heat, which can be helpful in certain cases like very moist and cool areas, such as basements.

If you want know how to grow big buds indoors, you have to understand the importance of VPD.

Whether you are growing weed in a closet or a tent, you will have to control the atmosphere.

Humidity is one of the more important factors to control and this is in part due to the fact that different humidity levels are best for different growing stages.

In general, the air humidity for growing weed indoors is as follows:

  • 70-80% after you see the first leaves
  • 40-70% during the vegetative stage
  • 40-50% during the flowering stage

Learn how to grow weed indoors with this step-by-step guide that'll teach you exactly how to turn a seed into a smokable dried flower. Free eBook included.