Container size

Just to give you visual of what pot size can do to plant size. First 30 seconds is all you need to see ;))) m.youtube.com/watch

3 Gallon is just fine.

30 liters is minimum and better start straight in soil, no presoaking , no other possible stress orslow down for her. If its single plant, maybe i would go with 40 liters pot. In my current grow all 3 different strains ocupied fully pot of 30 litets on week 6-7, so bigger pot would be utilized by them better.

A 3-gallon container can be suitable for growing autoflowers under a 150-watt lamp, but it depends on various factors, including the specific strain, growth medium, and desired final size of your plants. Here are some considerations: Autoflowering Characteristics: Autoflowers generally have a shorter life cycle and smaller size compared to photoperiod plants. They are often well-suited for smaller containers. Root Space: Consider the root space needed for your specific strain. Autoflowers typically have smaller root systems compared to photoperiod plants, so they may not require as much space. Growth Medium: The choice of growing medium (soil, coco coir, hydroponics) can influence the container size. Some mediums retain more moisture than others, affecting watering frequency. Plant Size Goals: If you aim for smaller plants, a 3-gallon container should suffice. If you want larger plants, you might consider slightly larger containers.

3 gallon will work for soil. I loje 4 gallon fabric when I grow in coco. Autos tend to do poorly on soil.