5 Best Indoor Strains 2020: Top Marijuana Seeds For High Yields

Best Indoor Strains

When you are just starting to grow marijuana, there are lots of decisions you are going to have to make. What kinds of strains will produce the best high and high yields? Which online seed bank are you going to choose? And most importantly, where are you going to grow your plants?

Many people choose indoor marijuana seeds to maximize their yields. Some of the best indoor weed strains for yield and potency are easy to grow and can improve the time to harvest. If you live in certain climates, growing indoors may be the best option for you anyway, as your growing season will be dramatically increased.

Here’s what to look for when you are searching for the best weed to grow indoors, as well as some of the best indoor strains for you to consider.

Why Should You Grow Marijuana Indoors?

There are many benefits to growing marijuana indoors, particularly once you’ve found the best strain to grow indoors.

For starters, you will have more control over your growing setup. You can monitor and adjust everything from the temperature to the humidity level. The time of year will not affect your growth, nor will extreme climatic conditions like excessive heat or cold. 

You can also remain in charge of variables like cleanliness and discretion, too. You will be able to keep your final product free from parasites, germs, and fungus. You will also be able to prioritize privacy, so if you have nosy neighbors, this kind of set-up could be the best for you.

Can Any Strain Be Grown Indoors?

Within reason, just about any strain of marijuana can be grown indoors. However, that doesn’t mean that all indoor strains will be the best indoor strains for your unique needs.

While not all the highest yield strains outdoors will also be the highest yielding strains indoors, in most cases, you can grow any kind of marijuana plant indoors. As long as you can control the proper climate, lighting, and humidity levels, you should be able to cultivate any strain.

However, not all plants and strains are equally viable indoors versus outdoors, and vice versa. Some plants are more sensitive than others, so if you live in a cold climate, you might not be able to grow the same plants outdoors as you did indoors. There is also the not-so-minor issue of pests. If pests find your plants outside, there’s not much you can do to get rid of them – besides spraying with harmful pesticides, that is.

The 5 Best Indoor Cannabis Strains of 2020

Northern Lights

Northern Light

Northern Lights is one of the top-rated indoor marijuana strains for growers of all skill levels. It is originally from the Pacific Northwest and is the precursor to Sensi Seeds. It is the perfect indica-dominant strain for indoor growers and can be found in many of today’s different hybrid strains. 

It only takes 45 to 50 days for flowering, and remains short and squat – which is just one reason why it is so perfectly suited to indoor growing. It rarely grows over a meter in height and produces powerful effects with high-quality leaves. 

The feminized auto-flowering version of the original Northern Lights is one of the best for growers with minimal experience. It reduces the amount of time you need to spend caring for your plants, as flowering is triggered as soon as the seedlings are about one month old. Many people are able to harvest from their Northern Lights plants up to three times a year!

It takes up minimal space and can be grown in both soil or hydroponic set-ups. It’s also remarkably low-odor, so you won’t have to worry about drawing the attention of your nosy neighbors. The perfect candidate for low-key cultivation, Northern Lights offers high yield batches and takes up minimal space.

Super Silver Haze

Super Silver strains

If you lived –  and smoked – through the nineties, you have likely already heard of Super Silver Haze. It’s not only prized for its indoor-growing friendliness, but also for its award-winning profile. It won three consecutive High Times Cannabis Cps, in 1999, 1998, and 1997. It was bred by Shantibaba and Neville Schoenmaker, and is a sativa-dominant hybrid that contains genetics from Skunk #1, Northern Lights #5, and Original Haze.

The reason why Super Silver Haze is one of the best indoor strains is that it can be somewhat finicky when it comes to indoor conditions. It can’t handle excessive nitrogen and is also sensitive to humidity and lighting. 

However, it’s a good plant for production, offering yields of up to 550 grams per square meter when grown indoors. Choose to grow this strain outdoors, and you’ll enjoy even more impressive yields of more than two kilograms per plant. 

It’s available in regular and feminized seeds and takes just eight to ten weeks for flowering. It is sweet and offers a psychoactive, energetic effect all wrapped into one sativa-dominant strain.

Amnesia Haze

Amnesia Haze

Amnesia Haze is known for being remarkably potent. It is one of the best varieties for indoor growers and while it takes a bit of experience to cultivate, it’s well worth the hassle. 

This common indoor strain has a whopping 22% THC and an average level of CBD, making it an excellent middle-of-the-road option. It provides a high that is euphoric as well as uplifting, giving you a head high with a feeling of zero gravity. 

With the freshness of haze with some pretty unique fruity flavors, Amnesia Haze takes up to 11 weeks of flowering to be mature. It is usually ready for harvest in late October, so a bit later than comparable strains. However, it produces yields of up to 700 grams per plant when dried and consists of a 70-30 sativa to indica ratio. 

One thing to keep in mind if you choose to grow Amnesia Haze is that it is not the best for small growing spaces. Although it is highly productive and produces high yielding buds, it can grow up to 170 centimeters tall and does not like being overcrowded. Overcrowding and a lack of airflow between your plants can, as with all strains, lead to an increased likelihood of fungal growth.

With lemony, sweet, and earthy tones, you will absolutely love the long-lasting, body-relaxing high that Amnesia Haze produces for you! 

Green Gelato

Green Gelato Strain

Green Gelato is one of the most popular cultivars in the country. A unique blend of dessert flavors like SUnset Sherbet and Thin Mint Girl Scout COokies, this indoor strain is sure to get you drooling!

With an impressive 27% ThC, you’ll love the sweet, citrusy, earthy, and dessert-like flavors of this strain. When the plants are young, you will need to train and prune them regularly. You might also need to top, fim, and mainline them, too. 

However, your hard work is sure to pay off. You’ll enjoy excellent yields of up to 700 grams per square meter on a plant that’s only 120 centimeters tall. What’s even better is that you’ll enjoy these yields after just eight to ten weeks. Green Gelato offers a physical, clear high, with slightly more indica than sativa and minimal CBD. 

Royal Gorilla

Royal Gorilla strain

Royal Gorilla used to be available only to American smokers, but now, it is grown all over the world (particularly in Europe). It is a 50-50 split of sativa and indica strains, offering up to 27% THC and a feeling of cerebral relaxation.

A complex blend, it includes elements of CHocolate Diesel, Chem Sis, and Sour Dubb. It has hints of pine and earthiness and grows wonderfully once it’s away from the harsh conditions of the great outdoors. It can take up to ten weeks to flower, but once it does, you’ll enjoy big bud production with gorgeous green leaves. 

You may not even notice the verdant nature of these green leaves, however, because the plants have so much resin that they look almost iridescent as they shine and glow in the light! Ready for harvest in the middle of October, it has low CBD and is one of the most relaxing indoor strains for you to consider.

Growing up to 160 centimeters tall, the plants yield up to 550 grams per square meter. You’ll enjoy the high yields and excellent quality of the smoke when it comes to this strain of marijuana.

Qualities of the Best Indoor Marijuana Seeds

When you’re shopping for the best indoor marijuana strains, remember that, as with outdoor seeds, you are going to want to look for excellent genetics and several other characteristics, too. 

For instance, you’re going to want a strain that is easy to grow. Having an easy-growing plant will not only reduce the amount of time that you need to spend caring for your plants, but it can improve the margin of error, too. It will be more forgiving of mistakes that everyone (but especially beginners) are prone to making. 

You may also want to consider a strain that grows quickly. A fast-growing strain will produce buds and a high yield in the shortest amount of time possible – this is something that you should really prize as a grower! 

A strain that is highly potent may also be a priority, although it’s not for all growers. To determine a plant’s potency, look at the contents of THC and CBD that it contains. The same goes for high yield – for most growers, high yields are imperative. After all, you want to get the most bang for your buck possible! All of the top-quality indoor strains that we’ve told you about above offer exceptional yields, especially when you consider how little space they take up.

To sum up, here are some things to consider when looking for quality cannabis seeds:

  • Appearance and Color

Edible quality seeds differentiate them from seeds that are not healthy. The natural colors of viable seeds include brown, tan, and black, while immature seeds are lighter, such as white, yellow, and pale green. 

  • Size and Shape

Cannabis seeds are said to be of good quality if their size is large and symmetrically round or teardrop in shape, whereas immature seeds are small and have an irregular shape. 

  • Hardness

The best seeds come with a hard outer shell covering, smooth, and uncracked, while poor quality seeds have a soft outer surface, wrinkled, and cracked easily.

  • Age

As you know that seeds degrade over time, to identify edible quality seeds; usually they are freshly harvested and are often more viable than other seeds stored months or years ago. To keep seeds fresh, store them in a cool, dry, and dark place so that they won’t get mold.

  • Do Float Test

Float test is a test to check whether seeds are viable or not. This test is so easy, you drop the seed into distilled water, and then see if it has enough mass to sink. As a rule of thumb, seeds that most likely float are poor quality seeds, while seeds that fall are the good ones.  

Make sure to do this test before you plant the seedlings since water saturation can cause it to decay.

Experiment with Different Indoor Strains

Still not sure which of these five best indoor cannabis strains is right for you? Don’t take our word for it – give it a try yourself! There are plenty of options you can choose from, but only you can decide which genetic qualities in the unique strains are right for you. It may take some time to find the right indoor strain for your preferences, but once you do, you will surely reap the rewards!

How to combine different cannabis strains

Mixing two different cannabis strains without giving much of thought can work; however, you are not sure with the outcome yet. To get your desired effect, you should think of these essential things: the cannabinoid and terpene profiles of each cannabis strain. Eventually, both strains will produce results that are different when you combine it with others.


Cannabinoids are responsible for the main effect of marijuana. With its high THC content, it will increase the experience, thus making a psychoactive effect. The joint effects of THC include euphoria, enhanced mood, increase in appetite, nervousness, anxiety, and paranoia. 

Please take note that CBD does not cause the feeling of high, somewhat it reduces stress and tension, bringing more peace of mind. That’s what most people know, but there are hundreds of cannabinoids present in the plant. They are usually present in smaller amounts compared to the two major constituents. 


Two things must be considered when mixing strains when it comes to the terpene part: the taste and the effect. Different strains have different terpene profiles, which contribute to a broader spectrum of flavour and effect. Compared to cannabinoids, terpenes cause the feeling of high, so consider this factor when mixing cultivars.

  • Linalool and limonene: offer a taste of tangy and citrus flavour, giving off a fruitiness taste in any mix
  • Pinene and humulin: these two components augment each other producing a refreshing tone of forest walks.
  • Caryophyllene and myrcene: both excellent pairs giving off a spicy and peppery flavour.

Recommended Strain Combinations

Listed below are some of the best-recommended strain combinations. Check them out and give us a comment down below if they are a “yay or nay.”

Royal domina and Medical Mass

Royal domina produces a psychoactive effect, while Medical Mass gives off a potent CBD content of around 10%. 

Sour Diesel and OG Kush

These two different strains give off intense flavour and high THC levels. Sour Diesel presents Sativa-dominant features of 70%, with high levels of THC and limonene producing an energetic and high effect. Meanwhile, OG Kush will give a more calming effect creating a well-rounded stone.

Royal Cheese and Blue Mystic

Royal cheese brings a more intense flavour and aroma, while Blue Mystic produces a complimentary taste of sweetness, citrus, and fruity flavours. Combining these two strains will deliver significant relaxation, perfect for people who have difficulty sleeping at night.

Wedding Gelato and Chocolate Haze

Giving off a 25% THC content, Wedding Gelato produces euphoria and an extreme feeling of high. On the other hand, Chocolate Haze brings a lucid and clear-headed situation, balancing the equation, which helps the user to function appropriately and creatively without diminishing the effect of general euphoria.

Lemon Shining Silver Haze and Shogun

Lemon Shining Silver Haze produces a high pack level of THC, bringing you under the feeling of euphoria. Shogun levels up cerebral energy to a higher level with a 25% THC content. It is one of the perfect pairs that will keep you going and engage in more physical activities.

What to Keep In Mind When Choosing the Best Indoor Cannabis Strain

As is the case when selecting any strain of marijuana, you need to keep a few factors in mind when it comes to choosing seeds for your indoor growing operation. 

For starters, you will want to consider your budget and whether you plan to grow a strain that is an indica, a sativa, or a hybrid of the two. Remember the varying effects that the two have, and prioritize which factors matter to you most. 

You also need to consider the setup of your existing or future grow room. How much space do you have? What shape is it in? What kind of lighting and watering systems do you have set up – or can you set up? All of these factors should – and will – influence the best indoor strains for your particular needs. 

To get you started, here are some tips for choosing the right strain of marijuana for your indoor garden.

Choose the right strain based on the size of your garden.

If you have a miniature indoor garden, you need to look for a high yielding strain that can quickly grow in a minimal-sized space. Small strains are compatible with increasing in tents and greenhouses. However, keep in mind that that indoor propagation of marijuana will restrict the space of the plant’s movements. Therefore, it is essential to know which cannabis strains to choose.

Consider the legality of cannabis in your area.

Indeed, not all states legalize marijuana since it is not yet approved in many countries all over the world. For growers who live in places where marijuana is prohibited, however, tolerated, it is best to grow your weeds discreetly. Therefore, you have no choice but to improve your cannabis indoors. 

Just a piece of advice when growing marijuana discreetly, look for small cannabis strains, so that they aren’t visible. Please use a grow box to plant your weeds. Keep in mind that growing cannabis in a box will restrict the plant’s personal space to grow. To cultivate marijuana in a tight space box successfully, choose cannabis strain with the weakest smell as possible. Guard dogs can find your cannabis if it has a strong odour.

Look for a strain that is hardy and has an active flowering time.

Auto-flowering strain of cannabis does exist. Whether you are a novice grower or a professional, it is essential to know this specific strain of marijuana. Some quick facts about auto-flowering cannabis strains are that they are not sensitive to intensity and duration in light. Take note that when you grow your cannabis indoors, both power and period of light is constantly turned on. However, if you planted them outside, some factors can affect, particularly the season of the year. 

Besides, your indoor weeds can be influenced by different elements, which can affect the flowering time of your plants. That is why auto-flowering strains are a great option because they can bloom with or without the presence of sunlight. 

Here are some of the examples of autoflower strains:

  • Sour Crack Auto: flowering time finishes up at around 7 to 8 weeks
  • Alaskan Purple Auto: finishes flowering time at 8 weeks
  • Californian Snow Auto: completed at just over 60 days
  • Purple Mazar Auto: has a fast flowering time finishing around 10 weeks
  • C99 x Blueberry Fast: flowering time completes at around 8 to 10 weeks

Choose cannabis strains depending on your needs.

Before you plant all the strains that you want, it is crucial to know the effects of every strain on your health. Indica strains are propagated due to their therapeutic use, while Sativa dominant strains are only for recreational purposes. So, make sure to conduct your research about the specific strain of cannabis you want to cultivate, and from then you’ ll get started.

Obtain your seedlings from a reputable source

If you are buying seeds in the black market, it would be a huge problem. Many newbies find it hard to ensure the authenticity of the seedlings they get from seed banks. If that’s the case, just research for a reputable seed bank, and once you find the right bank, you may call their customer service and ask for some piece of advice.

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