Growing cannabis in a square pot is certainly possible, but there are some things to consider when selecting the size and shape of your container.
First, the size of the pot will depend on the size of the cannabis plant you plan to grow. Generally, a small plant will require a smaller pot, while a larger plant will need a larger pot. It's important to give your cannabis plant enough space to grow roots and absorb nutrients, but not so much space that the soil stays wet for too long.
Second, the shape of the pot can impact the growth of your plant. A square pot may be more space-efficient than a round pot, allowing you to fit more plants in a smaller area. However, a square pot may also have less airflow around the edges, which can lead to the soil staying too moist and potentially causing root rot. You can mitigate this by ensuring that the pot has adequate drainage holes and that the soil is well-draining.
Overall, using a square pot to grow cannabis can be a viable option, but it's important to select a size and shape that suits your specific growing needs and environment. Make sure to research the best practices for growing cannabis in containers and adjust accordingly to ensure a successful harvest.