What defines a mature marijuana plant?

A mature marijuana plant is defined as one that is in the flowering stage of its growth cycle. This stage is crucial because it signifies that the plant has reached reproductive maturity and is capable of producing flowers, which are essential for obtaining the desired cannabinoids, such as THC and CBD.

In the context of cultivation, a plant transitions through several stages: from seedling to vegetative and finally to the flowering phase. It is during this flowering phase that the plant exhibits the characteristics needed for harvest and product development.

The other options do not accurately represent the criteria for a mature marijuana plant, as being non-toxic does not relate to maturity, harvesting indicates that the plant has already completed its growth cycle, and age alone does not determine maturity; rather, it is the plant's stage of development that defines it as mature. Thus, the correct identification of a mature marijuana plant is directly linked to its flowering status.