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best cannabis seeds to grow indoors in the uk

Before we share our top 5, it’s important to understand the climate of the UK when it comes to growing cannabis outdoors. In this way you understand the growing conditions better and you start your breeding well prepared.

Tip: check our feminized OG Kush strain seeds

The UK climate

Critical autoflowering is one of our fastest flowering autoflowers and produces a high quality weed production. With its strong genetic background (50% Indica, 30% Sativa and 20% ruderalis genes), Critical is a very strong autoflower that will develop well in harsh conditions. In short: suitable for the UK climate.

The UK climate is generally cold and wet. Not ideal for the cultivation of a weed plant. Of course you don’t suffer from this when you grow indoors, but if you want to grow outdoors in the UK, it can be a challenge. Fortunately, breeders have developed varieties that can produce good yields even in the climates of the UK. Good results do I hear you think? We actually mean excellent results!

Do you want to limit the risk of a failed harvest and do you think the production of a normal autoflower is too low? We have some good news. Our Big White Widow auto can grow up to 180 cm high. Besides, they produce high yields and aren’t dependent on the transition between summer and autumn to bloom. Moreover, the Big WW is a very strong and reliable strain, suitable for outdoor cultivation in the UK climate.

Technically, yes. All strains can be grown indoors—although some varieties are much more suited to this environment than others. Bushy indica and autoflowering strains rarely exceed 120cm in height, and are thus naturally compatible with small spaces.

Towering sativa strains have the potential to surge to heights of 300cm. Growers can limit vertical growth by planting them in small containers, but they won’t produce as good of a yield as strains specifically bred for indoor cultivation.

Why Grow Cannabis Indoors?

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Indoor growing also allows cultivators to take control of time (to a degree, at least). Photoperiod cannabis varieties begin to flower only when the hours of light decrease leading up to autumn. Indoors, growers can change the light cycle to trigger flowering whenever they want. Alternatively, they can extend the growth phase by keeping plants under a veg-specific light cycle.

Fortunately, breeders have tinkered with cannabis genetics to create varieties that are ideal for indoor growing. These plants remain short, and are easy to manage and train. They’re suitable for small grow tents, and some cultivators even go to the extremes of raising them in refurbished computer towers and cupboards for added stealth.

Our Critical feminized seeds are probably one of the best cannabis seeds to grow indoors. And not without reason. Critical is very suitable for extremely small spaces as they do not grow larger than 80 cm. The strain is easy to grow, features a very short flowering time and yields are quite big. When pruned at the bottom, the buds grow at the top. In this way it is possible to place up to 16 plants per m2 which can result in a yield of up to 500 grams per m2.

The AK-47 autoflower is one of our favourite classic strains and one of the best indoor cannabis seeds. The AK 47 autoflower is second in this top 5, but actually deserves a shared first place. Thanks to its genetics (Thai Skunk, Mexican Sativa and Afghan) the AK 47 autoflower is known for its extremely high fungal resistance and high yield. Yield can be as big as 675 grams per m2(!). The genetics are very stable and easy to grow indoors. A failed harvest is therefore almost impossible.

AK 47 autoflower

Growing cannabis indoors is becoming increasingly popular which is not surprising as it offers many advantages. You can grow all year round under constant ideal conditions so there is a good chance that you will end up with a cannabis plant with a good yield. However, not all varieties are suitable for indoor growing. And because there are so many different types of cannabis seeds, it’s often difficult to find them. Of course you also want to grow cannabis that meets your preferences. Think of taste, yield, effects and flowering time.

Amnesia Haze is another classic strain and couldn’t be missing in our top 5 best indoor cannabis strains. The strain is worldwide known because of its very high THC level. Thanks to its properties Amnesia Haze is very suitable for indoor cultivation. The only “drawback” we can think of is the relatively long flowering time of 10 to 12 weeks. However, every disadvantage has its advantage. Due to the long flowering period the weed is extremely strong, the yields can reach 650 grams per m2 and both the taste and the smell are sublime. Keep this in mind, because if you’re sensitive to psychosis, it’s better to skip these weed seeds and opt for milder ones.

So what are the best strains to grow indoors? With this article we are going to help you make your personal choice by putting together a top 5 best cannabis seeds for indoor. By the way, do you want to know how to grow weed indoors? Make use of our step-by-step plan ‘Growing weed indoors‘.