The groundsman - known as the 'curator' in Australia - is the person with the responsibility for preparing the pitch and the playing area for the match, with the assistance of the groundstaff.
Control of the use and maintenance of the pitch and the playing area passes to the umpires after the toss has been made before play commences. From that point until the end of the match it is the umpires who will make the decisions on whether or not the pitch is fit for play or requires covering, and so on. Good groundsmanship is a highly-skilled craft and good groundsmen are much prized by their clubs.

To find out more about what's involved, visit The Institute of Groundsmanship.