rasputin:

The Flower Grenade designed by Suck UK. They are completely biodegradable seed bombs, and come packed with soil and various seeds, including Buttercups, Ryegrass and Poppies. They won’t make a big bang when they land, a few weeks later, some flowers will be left. The flowers(Buttercups and Poppies) will take at least 3 weeks to start growing, the Ryegrass will pop out after only a week.