There is little doubt that getting cannabis from a store or a dispensary is better than getting it from a dealer. However, as a home grower, you can get the best quality from growing weed seeds. If you can grow weed seeds yourself, you will not only get better quality weed, but you can also control the amounts of THC and CBD in your weed.
Additionally, many of the problems that result from growing marijuana in commercial conditions can be avoided with growing weed seeds at home. For example, most weed seed is typically imported from somewhere like Mexico or Canada. This means that you are not always guaranteed that the marijuana that you get will have 100% of the THC. Even though this type of weed will have some THC, it will not always be 100%. With growing weed seeds, you have full control over the exact amounts of THC and CBD that will be in your cannabis.
Furthermore, there are often high levels of pesticides and fungicides in the marijuana that is available in the stores. Most dispensaries purchase their weed from large seed-bulk growers in states like California or Washington. These growers can be fairly careless when growing marijuana, and this can result in the contamination of marijuana.
Finally, the cannabis that is typically available at dispensaries is often treated with low quality hydroponics solutions and fertilizers. If you grow weed in commercial conditions, you are not always guaranteed that your marijuana will be in the best condition. The weed that is available in the stores may have the appearance of having been through a rigorous grow, but it does not necessarily have the best conditions.