The Havering-based company will water, prune and control plant pests at the City Hall headquarters of the Greater London Authority.
CompeteFor is a free service enabling businesses to vie for contract opportunities linked to the London 2012 Olympic Games. Contractors can also bid for work from public and private-sector organisations, such as Transport for London, Crossrail and the Metropolitan Police Service.
Enterprise Plants won the bid after being shortlisted with nine other businesses. "When we heard London would host the games, we were curious to see what new opportunities might arise," said sales director, Matt Monckton. "As a niche business, I regularly log on to search for contracts."