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autoflower grow

Autoflowering cannabis plants are hardy, fast, and easy to cultivate in confined spaces. What’s not to love? Learn how to grow them week by week below.

Autoflowering strains provide fantastic results in little time, often surging from seed to harvest in as little as 8 weeks. Both beginner and advanced growers will have a fun and easy time raising these varieties.


Autoflowering strains typically move from seed to harvest in 8–10 weeks. However, some varieties can take up to 12 weeks to fully mature. Strains such as Bubble Kush Automatic and Quick One fall towards the faster end of the spectrum, whereas varieties like Royal Creamatic and Royal Haze Automatic take a few more weeks to ready their buds for harvest.

Learn to grow autoflowering cannabis.

The pH value of your soil will determine how well your plants can access the nutrients within. If the pH becomes too high (alkaline) or too low (acidic), nutrient lockout will occur and deficiencies will set in. Cannabis plants thrive in a soil pH of between 6.0 and 6.5. Use a pH tester to track pH throughout your grow.

What yield can I expect per autoflowering plant?

It’s important to start autoflowers in their final containers rather than planting them in smaller ones and transplanting them later. Sure, growing cannabis is like growing tomatoes, but autoflowers have a limited time period and can’t afford to lose days while the plant settles and searches for roots.

Of course you can, you can grow autoflowers in a greenhouse all year round as long as you keep the inside temperature to a minimum of 15°C and there’s enough ventilation, airflow, and sunlight.

PH levels

Some growers also flush during the pre-flowering stage, when the plants are transitioning from the vegetative into the flowering stage so they can start feeding from zero, as said above, this won’t hurt your plants but should be done properly.

Most plants die if you over or under-water them. Yes, autoflowers need water to grow, but it’s critical to supply it only when the plant needs it. It’s obvious that the timing is important even when the plants need water.

Growing plants in hydroponic setups seem very cool, but soil is your best bet if you have no experience. Avoid using clay soils that clump up because autoflowers thrive in well-aerated soil. A soilless medium of equal parts of peat moss or coco peat, perlite, some airy soil, and sand is the best potting mix for autoflowers.

Bigger autoflowers need bigger containers, so make sure you check the description before purchasing seeds. Root aeration is often overlooked, but it’s an important factor in determining your yields.

The successful autoflower grower will also fully understand the importance of optimised grow room conditions. Avoiding wild fluctuations in temperatures/humidity and maintaining your autoflower plant in the ‘sweet spot’ of steady environmental conditions is key. Avoiding over feeding and under feeding is one of the more important rules. If you can maintain stable, optimised grow room conditions and if you can combine this with good cannabis genetics then you should be set for a great harvest!

Indoor, or outdoor, cannabis plants will struggle to reach their full potential without access to intense light with the right spectrum. If you don’t have sufficient light it will definitely compromise the final autoflower height.

Your autoflower is root bound (not enough root space)

You may have got unlucky and simply got a short, squat phenotype. Don’t despair, many of these will still offer potent, firm buds. Or you may have had the misfortune to encounter an issue during growth which has permanently stunted your auto. There are a range of reasons which could explain why your autoflower has stayed small.

This can be quite disconcerting for the grower that has just invested heavily in the most powerful grow room light possible. A new, high powered grow light can be a great investment for the indoor grower (especially an LED light), but they sometimes come with a learning curve which may take a grow or two to master. The best grow light suppliers will be able to recommend hanging heights and intensities to suit different types of cannabis (auto vs photoperiod fems) at different stages of growth.

Because autoflower seeds grow with a fixed lifetime, usually around 75 days, there is less time available to overcome any difficulties. Often an autoflower shows signs of bloom around a month, or so, after germination. Autoflower seed varieties such as Auto Blueberry and Auto Blackberry Kush can be ready to harvest in as little as 8-9 weeks after seed germination. With such a fast-track life, an autoflower has little spare time to recover from any growth problems or environmental issues during the first weeks of vegetative growth.