It's a wonder someone hasn't come up with a sealed pot growing kit, like those they use for wine making. Just add water and leave in sunshine. It's a weed fer ferks sake. How hard can it be to make for yourself?
Small "indoor greenhouses" have been available for at least 20 years. It's not quite as simple as you suppose.
1. You want
sin semilla (seedless) because: A. The seeds take a lot of work to remove; B. They account for a considerable portion of the weight that the customer is paying for; C. They have virtually no THC; D. The plant puts a lot of its energy into growing the seeds, resulting in low yield.
2. What you actually want is
buds, because they have a much higher THC content and a much larger percentage of their weight and volume is usable.
3. In order to avoid going to seed, you have to keep the plants under (real or simulated) daylight 24/7 until you're ready to harvest.
4. When you're ready, you put the lighting on a 16-hour-on/8-hour-off schedule, which simulates the end of summer and causes the plants to produce buds.
Unless you live in Alaska (which is actually a fine place to grow it, since it is, in fact a
weed that will grow almost literally anywhere), it's impossible to do this outdoors.
This is why indoor growing has become so popular. An indoor greenhouse that fits in a small closet in an apartment will grow enough weed, year after year, to meet the needs of two people, assuming that they are not maniacs about it and go to work and have other sober, responsible activities on their schedule.
People who live in rural areas can grow it outdoors, but as I noted, their plants do not produce nearly as much product as indoor greenhouses. So they have to decide between not having as much as they want, vs. growing a large garden which is likely to attract the attention of the authorities.
In places like Colorado, where cultivation, sale and use is legal, most producers do in fact use indoor equipment.
Note: I lived in Humboldt County, California, for many years. At the time its huge redwood forests were arguably the center of the U.S. cannabis industry, so it was almost impossible NOT to pick up such information. Apparently cannabis is one of the few plants that thrive in acidic soil, and redwood trees secrete tons of acid into the soil. This discourages the growth of most underbrush, which is why you almost never read about a fire in a redwood forest.
