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how big can autoflowers get

Most autoflowers start flowering in the third or fourth week, so start training only if the plants grow fast and remain healthy enough to be trained. If you’re unsure, it’s okay to not train the plants at all.

If you’re unsure of any of these questions, you’re not yet ready to sow autoflowering seeds. Other types of plants allow you to plan things after sowing seeds, but for the love of God, don’t try that with autoflowers. The minute you soak seeds in the water, the clock starts ticking, so think through everything including the medium, container, ventilation, lighting, grow room and space before planting anything.

1) Prepare ahead

The pH is an important factor in determining the yields of autoflowering cannabis strains. Whether you grow hydroponically or use soil as a medium, pH is critical. Although many growers assume that the plant is suffering from nutrient deficiencies, most issues crop up only due to pH imbalance.

Due to a shortage of time, not every training technique working for other cannabis plants suit autoflowers. For instance, HST or High-Stress-Techniques work very well on photoperiod plants, but autoflowers prefer Low-Stress-Techniques or LST.

LST is a method that requires bending the stems of the plant so that the light penetrates to the lower parts of the plant. Generally, autoflowers tend to grow one main massive cola while the rest of the plant produces small budlets known as popcorn buds.

You must also remember to train cannabis plants only during the vegetative stage. Doing so in the flowering phase will stunt the plant drastically. Many growers simply stay away from training autoflowers because they produce good yields even when they aren’t trained; however, a combination of any of the techniques mentioned above will deliver stunning results, which makes training plants a matter of personal choice.

Autoflowers grow fast and vigorously, and have only a limited time to do so. Because of that, you want to support their growth in every way possible. A loose and airy growing medium makes it easier for your autoflowers to develop a strong root system.

Whether you are planning an indoor or an outdoor grow, make sure to start your seedlings indoors.


If you must add nutrients to the soil early on, do so sparingly. Generally, bloom nutrients and boosters are all that’s needed during their life cycle. Even in flowering, low to medium doses of nutrients will suffice. Over-fertilising plants is a common yield-thwarting mistake autoflower growers often make.

Something can always go wrong when growing cannabis. The key to high yields is swiftly and smartly identifying problems as they occur. As you refine your processes, the health and yields of your plants will improve over time.

If the pH is off, your plants can’t uptake nutrients even if they are present. The correct pH for your water when growing in soil is 6.0–7.0. With a few drops of pH up or down products, you can adjust your water to the correct pH window.

Providing too much nutrients will burn your plant. She will start showing signs of nutrient toxicity and start struggling to absorb nutrients. This will make her sick, growing smaller and underperforming.

You can also grow a tall autoflower in a small pot sometimes they adapt and sometimes they don’t, the best way is to experiment with different strains and test it.

Note: Bug problems can become really hard to deal with if left untreated for too long, by noticing them early you prevent any problems. If you get to the point where you need to apply any kind of plague controller (preferably natural) r emember, you should NEVER apply any kind of plague controller during flowering, only if it’s extremely needed. This will STRONGLY affect your final product, mainly the flavor and smell of your bud.

Light Cycle for Autoflowers

Pot size is a very important aspect for your autoflowering plant’s size and determines the limit to where she can grow. If the pot is too small your plant will become root-bound (this means the roots don’t have any more space to grow) affecting nutrient intake. Your plant won’t be able to breathe properly and is more likely to die or yield almost nothing if you don’t transplant it quickly.

These minor factors can affect growth in a bad way, stunting growth and affecting yield. If left untreated for too long, they may ultimately kill your plant.

Have in mind an autoflower can yield as low as 10g (0.3oz) if not given the light she needs, and can yield 80g (2.8oz) or more given the ideal environment.

If the amount of nutrients is too little your autoflower will show signs of nutrient deficiency. Without nutrients your plant can’t grow and there will be similar results as nutrient toxicity, stunted growth, and small yield. If left without nutrients for too long your plant will die.