Let's hear it for tiny urban forests

Elizabeth Hewitt wrote in National Geographic last year:

Data released by Wageningen University researchers in April shows that the forests host a range of animal and plant species. Across the 11 Tiny Forests in the study, volunteers observed 636 animal species. They also identified 298 plant species in addition to the original species planted in the plots. Maintenance of the forests occasionally involves thinning out aggressive weeds, but in general new plant species, such as wildflowers that appear, are allowed to grow.