The ability of Huangpu to keep nature at bay is testament to the wealth of the district. Left unattended the plants will quickly take over in such fertile soil, but a small army of landscapers and cleaners holds it back. The places the cleaners find to stash their equipment are always dry and secluded; often good choices for placing geocaches too.
Depending on the grass type it's likely that the grass and greenery here requires cutting and trimming at least once each month, and probably even more frequently.