How To Grow Marijuana From Seed


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The expert source on how to grow marijuana by Robert Bergman, Amsterdam. Grow successfully with our guides and helpful experts! A growing number of experts are making a business out of teaching people how to grow their own pot. Here's what to know to get started. Growing marijuana indoors isn’t as impossible as you might think. Learn how to grow plants inside with this step by step guide with infographic.

How To Grow Marijuana

You came to the right place! Maybe you’re here because you’re tired of paying way too much for overpriced weed. Or perhaps marijuana helps relieve ailments. Regardless of the reason why you want to learn how to grow marijuana, we’re here to help!

Our Grow Guides section is divided into several topics: Beginners, Plant Biology, Grow Stages, Indoors, Outdoors, Grow Mediums, Plant Care, Troubleshooting, and Advanced Guides

Buy Marijuana Seeds

Good grows start with great seeds! We’ve got you covered with our high-quality marijuana seedbank.

Commonly, growers look for Feminized seeds, but if you’re starting out, you may want to buy Autoflowering seeds instead. If you’re looking for diversity, our Mix Packs provide a seed variety pack for everyone. Don’t want to think too much and just get growing? Grab a complete Grow Kit and you’ll be sprouting in no time!

  • Grow With My Quick Start Guide
  • Discover Secrets To Big Yields
  • Avoid Common Grow Mistakes

Grow Journals

Keep track of your grow! Combine details like grow stage, temperatures, feeding and more to get a good perspective of your plants. Not growing yet? Learn from other people who are growing the same seeds that you will receive.

Strain Reviews

Since the sixties, hippies have trailed across the Hinu Kush mountains to Thailand and beyond to bring heirloom indica and sativa strains to Amsterdam. Every since, thousands of marijuana strains have been developed. Find our take on the best marijuana strains out there.

State by State

A lot has changed in past decades. Many states have decriminalized marijuana or allow medical use and more states start to allow recreational use. Here you’ll find the current situation in your home state. Additionally, we explain how to handle an outdoor grow in your state, or how to set up a commercial venture.

Growing a Single Plant

A good place to start is with simply growing a single weed plant. No high-tech grow room. No massive expenses. Just you, a pot, some soil, and a high-quality seed. In this guide Robert Bergman takes you by the hand to take those first steps into the hobby and sharing his love for growing marijuana.

Outdoor Grow Calendar

Growing outdoors means you’re dependent on the weather. Climates vary from place to place and from time to time. With our grow calendars for the northern and southern parts of the USA, we remove the guesswork and give you the tools to properly plan out your outdoor grow.

How Much Can I Yield?

Still considering your grow? Or are you having trouble getting the most out of your plants? With the proper preparation, equipment, skills, and knowledge, you too can grow a massive yield. Don’t just wing it, turn your hobby into a science and fill up those mason jars with gloriously heavy nuggets.


Even the best growers out there can have a stroke of bad luck. Airy buds, stretching stems, hanging or yellow leaves, I’ve seen it all! With my Symptom Checker, you can easily match what’s wrong with your plant and find an appropriate way to fix it. No matter if you’re having trouble with pests, environment, or nutrient deficiencies, we’ll help you get through it.

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Latest Articles

Besides growing marijuana, we have loads of other cannabis related content, like cannabis lifestyle blogs. The usage of marijuana. Setting up a canabusiness. Grow diaries. Repices for edibles, and much, much more. Find all our latest articles below

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About ILGM

Hello! I’m Robert Bergman. I’m a marijuana growing enthusiast and the founder of ILGM. I’ve spent the last 25 years learning everything there is to know about growing marijuana. When I started growing I was in a home-based setup where 5-plants were all I had space to grow!

I’ve grown a lot since then (pun intended). I’ve run industrial-sized plantations and labs where we bred newer,

better, and more reliable strains. Then, after years of large scale growing, I had an idea. I wanted to share my knowledge of growing weed-and I had a lot (nearly two decades worth). In that time I’ve dealt with every issue imaginable. Now it’s time to share everything I’ve learned with you!


We ship marijuana seeds daily to all of the United States. No exception. For FREE!


If your marijuana seeds don’t arrive, we will ship your seeds again. For FREE! It’s only fair.


We stand by our weed seeds and want you to have the best experience possible.

Grow Support

Robert’s grow guides and our Support Forum will help you every step of the way!

As marijuana is legalized in more places, here’s how to grow your own

When it comes to growing his own marijuana, Chris Haynie leaves little to chance.

Inside a grow room in Richmond, Haynie has erected a 42-square-foot tent that houses four marijuana plants, the state’s legal limit for personal cultivation. Haynie’s setup is high-tech: An irrigation system releases moisture on a precise schedule; a motorized LED light timed to mimic the rising and setting of the sun moves along a rail across the top of the tent; and a monitoring system tracks key metrics of plant health, such as the moisture level and pH of the soil, and relays the data to an app on Haynie’s phone. If the system senses urgent problems, he’ll receive a warning text. Haynie’s friends are used to him bolting from a room mid-conversation to tend to his plants.

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Haynie, a bearded 38-year-old cannabis connoisseur who tattooed his thumbs with green ink, is no horticulture amateur. As the co-founder of Richmond’s Happy Trees Agricultural Supply, he’s part of a growing number of experts who are making a business out of teaching people how to grow their own pot. Recent laws in Virginia allow for limited cultivation of marijuana for personal use, and Happy Trees, which Haynie launched in 2019 with Josiah Ickes, 36, specializes in setting up growers to cultivate the plant.

Marijuana remains illegal on a federal level, but many states have abolished restrictions, creating a patchwork of rules throughout the country. Eighteen states and the District of Columbia have passed laws allowing recreational use. Virginia legalized home cultivation in July 2021; under the law, people 21 and older may possess up to an ounce of marijuana. It remains illegal, though, to buy or sell it in any form — including seeds — until 2024, when retail sales are expected to begin.

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People still find ways to access seeds. When D.C. legalized the possession of limited amounts of marijuana in 2015, the District lacked the authority to create a legal economic market for sales. So cannabis activists organized seed giveaways throughout the city. At one early event in 2015, lines stretched for blocks.

The regulatory scheme also established what has become an expansive “giveaway market,” in which Washingtonians have used a loophole to provide harvested marijuana as a gift in exchange for the purchase of a legal product. Companies sell cookies, tea or paintings with a baggie of “free” marijuana on the side. One company sells motivational speeches delivered by a person who travels by bicycle.

A Step-By-Step Guide to Growing Marijuana Indoors

In many parts of the United States – as well as throughout much of the world – growing cannabis is now legal. That’s great news! If you’ve come to the decision to start growing your own weed, you have even more reason to celebrate. With the advent of the COVID-19 pandemic, some people are thinking of growing their own and becoming self-sufficient wherever possible.

Here are the five steps to growing weed indoors that you need to know about. We recommend using soil as a growing medium for beginners.

Download Our 7 Page Guide to Growing Cannabis

Choose the Right Seeds and Get Them Germinated

The first step to growing weed indoors is to start with the right seeds. What makes a good seed? For starters, you’ll want one that is dry, dark-colored, and hard – ideally, one that is purchased from a reputable seed source.

When you’re buying seeds, you’ll be able to choose between feminized and non-feminized seeds. Opting for feminized seeds can save you some time. Non-feminized seeds can help for breeding purposes, but many tend to get rid of their male plants if they are not breeding. Those who are just starting out may want to stick to autoflowering or feminized seeds.

Otherwise, you’ll have to decide between indica (great for a calm, relaxing high) or sativa (perfect for a more energizing, uplifting high) strains. You can also pick a hybrid, which will blend the best of the two different strains. However, it is important to realize that a plant’s effects are generally determined by their cannabinoid-terpenoid profile, not necessarily just whether or not they are indica, sativa or a hybrid. Yes, there do be to be some broad patterns between the type of cannabis and its effects, but this is not always the case. Hybridization has also blurred the lines significantly.

Now it’s time to germinate! You will have to soak your seeds on paper plates ahead of time, then wait for them to germinate. It can take a few days for this to occur.

Wait for Seedlings to Emerge

Once your seedlings emerge, it’s time to transfer them into the growing medium. The type that you choose it’s up to you – while most people grow weed in soil, others prefer hydroponic setups. Regardless, you’ll want to plant them about 10 mm deep in the medium. Keep it damp, but be sure not to overwater.

Move Into the Vegetative Stage

The next step is to wait for your plants to move into the vegetative stage. At this point, you are going to be providing about 18-24 hours a day of light, along with temperatures around 70 to 85 degrees. You will need to water frequently, supplying extra nutrients (particularly nitrogen) on a regular basis. If you didn’t get feminized seeds, you will need to remove all male plants at this point, too.

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If you want to avoid trying to find the right seeds to buy and the germination process, you can buy clones from a dispensary. This can help you find an appropriate plant for your needs with far less work, and can avoid the vegetative stage entirely.

Enjoy the Flowering Stage

In the flowering stage, your plants will develop thick, heavy-scented buds as all of their energy is focused on bud development. They’ll grow much larger, too, as the buds, hairs, resign glands, and trichomes develop. This is when you move to a light cycle of 12 hours of dark and 12 hours of light. Light leaks during dark time can stress the plants out and can cause the plant to develop hermaphroditism and produce seeds.

Stop training your plants, and towards the end of flowering, stop giving nutrients and start to flush your plants using just water.

Depending on the type of plant, most cannabis strains finish flowering between 6 and 14 weeks. Indicas and autoflowering strains usually finish flowering between 6 and 9 weeks, hybrids 8 – 12 weeks and sativas between 10 and 14 weeks. This is not a hard-and-fast rule, but most cannabis plants of different types follow this pattern. The phenotype expressed matters as well. For example, a hybrid that expresses indica will likely finish flowering sooner than a hybrid that expresses sativa. You can read more about Cannabis indica, Cannabis sativa and Cannabis ruderalis here.

Some people also decide when to finish flowering by looking at the trichomes (the glandular hair of the plant). This can help growers determine when the plant’s cannabinoids and terpenes are fully formed. The trichomes usually go from clear, then cloudy, then amber. Many people harvest when most trichomes are an even mixture between cloudy and amber. For some, harvesting too early in the cloudy stage can lead to a more uncomfortable experience, whereas harvesting when a number of trichomes are amber can impart a more “relaxed” and less overwhelming experience.

Finally! Time for Harvesting and Curing

After all your hard work, you get to enjoy the harvesting and curing process. You’ll want to cut the main stem and then hang the plants to dry. Trimming and curing are the last steps, which can take up to five weeks to complete.

Congratulations! Make it through these five steps, and you’ll be a pro in no time.

You are now part of a rapidly growing hobby that is taking the world by storm. Growing your own weed is a fun, low-cost way to flex your green thumb and to cultivate your own love of cannabis – right at home.

Take a look at the below infographic or download our free 7-page guide which is the perfect guide for anyone starting out on their cultivation journey:

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