This is an ad campaign run by Addidas and on the front cover of this month's Dazed. Essentially, it is instructions on how to mix a wild flower seeds with some compost and make a "seed bomb". They even attach a packet of seeds to the front cover to help you on your way.
And for the really keen among you, there is even a competition for the best judged creations. You can find more information here: http://www.dazeddigital.com/projects/grun/