I have done it. A friend of mine every year buys a big bag of wild flower seeds and makes a walk and just throws it around. Sometimes we go together.
I would love to do this with more people that like making the city a nicer place. So if anyone is up for doing this around the Noorderpark, contact me!
I do not really use any social media, so I also do not know about groups that use that. But if anyone is up send me a message through this forum!