The world’s smallest public park is located next to the Binnenhof in The Hague. The information board is more expensive than the construction of the mini park. The park is also abused by miscreants and needs to be repaired every time.
Here another example of promotig green, but this time it is a public effort. This cupboard is located on Koningsplein and residents with green fingers maintain the cupboard and its contents. Plants and seeds are exchanged there. Much better.