It appears to be one of some unconventionalemerging trends, probably a logical development of our increased need to be in contact with nature. Plant enthusiasts are now creating mini-gardens in suitable spots in their cars:
source: Evoke
I don't know how practical is this even in a safe place, but for sure it is better than the air fresheners we see in so many cars. And also, plants are known to purify the air and absorb harmful toxins. Mint, for example, is an instant freshener.source: gardeningknowhow
How do you like the idea?
This trend is part of a major trend in interior design that aims to restore the connection of man from the big city with nature.