Agrotonomy has set up Tower Garden projects for users around the world, including this cannabis tower garden farm in Ibiza. The main advantage they found was the cheaper cost compared to the different nutrients that would need to be added to soil growing and, of course, the amount of water needed. Because the Tower Garden recycles the water and nutrients, you get a much more efficient system.
Cannabis in Ibiza, like the rest of Spain, exists in a legal gray area. While it’s illegal to buy, sell, or possess cannabis in public spaces, it IS legal to grow and consume weed privately. Agrotonony made a video showing how successful a tower garden is for growing 6 plants for personal use.
Germany has also legalized cannabis for personal use in certain circumstances, which I believe will be of tremendous benefit to people who want to use it for medicinal purposes. As an herbalist, I have often been approached by clients who are in pain ro who are suffering from anxiety and who have told me that they rely on buying certain strains illegally in the UK. This contrasts tremendously with my clients in Australia who have been able to get different strains prescribed for specific needs. Likewise, the various States in the USA have different laws.
If you want to follow the inspiration from Ibiza Farm by Agrotonomy, I recommend you check the local laws before purchasing a Tower Garden for this purpose.