A tag tells you what soil preferences the plant has and its resistance to different diseases. As you can see, there is a wealth of information on one simple plant tag. There is nothing worse than going to a garden center and finding a plant with beautiful flowers and colors and not finding a plant tag in the pot. I don't have the time to go home and try to identify it through books. I want to know right away.
Tags are important marketing tools for the grower.
Sending out a flat unmarked is probably not going to move as fast at the garden center as the flat with a visual aid, namely a plant tag. Those same visual aids are equally important to the consumer as well. Aside from the reasons mentioned above, here are some other ways that I use a plant tag. A picture is worth a thousand words. When I walk around a garden center with no particular plan in mind, the photos on the tags help with my decision-making.