You need a male, to breed. Are you cloning your male? How do you pollenate? Have you done any pheno selecting? Im mean, lets say you take an excellent Afghan and a superb Moroccan male, you pollenate your Afghan. It made seed… what do you do next? You may have cloned the excellent female and superb male, but if you only breed them you will only get more seed right? Lets say you grew many plants from mom and dads seed? They are all kinda different, some big, some wide, some tall, some smell great but suck in the shape department? Well we pheno select and can do one of two things right away… take our 3 finest females and breed them with our cloned male… remember we liked him. We can also take our finest 3 males and breed them with our cloned female… this the starting point in our breeding process. We continue to select our finest examples and breed them into our desired parents. This process will begin to select for traits, and after several iterations, you will begin to see homogenized characteristics and your plants will mostly be similar from planting to planting. Its why a crop that has been domestically grown without additional genetic input looks the same from plant to plant. The issue is that eventually your seed will begin to lose vigor and new gentic material helps to get that back.