Visit Grass&Green to improve the classification of grass-related entities. As a start, it now only German Dataset, however it is a research to generalize the concepts and ensure the feasibility of the methodologies.
It is very simple QA tool with easy Interface
Login by your OSM account
check the provided recommendation, change them if required and express all the plausibility
Guide and help is provided to introduce all the grass-related classes
That's all, enjoy it and improve the data quality