Durban Poison cannabis plants are easy to grow even for first-time cultivators. These plants grow very tall and can reach maximum heights of 12 feet, which means you’ll need to provide ample vertical room for these plants to grow. Durban poison plants perform equally well indoors and outdoors. Outdoor plants will grow similarly to indoor plants if you have access to a greenhouse where the climate and height can be controlled. While some cultivators prefer to grow their cannabis plants in natural sunlight and fresh air, others prefer the more predictable and easy-to-manipulate indoor growing climate. Whether you grow indoors or outdoors, you are going to need a climate that is similar to that of its South African origins. Ideally, the temperature should be between 70 and 80 degrees Fahrenheit. The relative humidity should be between 40% and 50%. If you are going to grow this strain indoors, you will need to replicate the warm and semi-humid climate these plants are used to. If your local weather is similar to its preferred conditions, your crop will perform exceptionally well outdoors. However, setting up your grow inside or in a greenhouse will help remove outdoor variables from the equation. Durban Poison plants should be pruned and trained to prevent overcrowding. Because these plants are super-tall, they need near-constant trimming to manage the growth. If the height of these plants isn’t controlled indoors, they run the risk of burning at the topmost buds because they will grow too close to the grow lights.