Cleve West's Daily Telegraph garden, which won best in show, is his fourth garden at Chelsea, where he won Gold Medals in 2006 and 2008, a year he also won the people's choice award.
West declared: "Words cannot express how delighted I am feeling today. I would like to thank the entire team, including Crocus, which worked tirelessly to prepare and build this garden."
The design was loosely inspired by the Roman ruins at Ptolemais in Libya. Key features include a sunken space using reclaimed Cotswold stone for paving and walls, Sophora japonica trees and contemporary sculpture.
West added: "We have created a mixture of traditional and new styles which produces an interesting energy so I hope it gives people the inspiration to do the same."
The best urban garden award went to Jamie Dunstan's Winds of Change, which was sponsored by Stockton Drilling. The Korean garden Hae-woo-so (Emptying One's Mind) created by Jihae Hwang won best garden in the new artisan category.
Among the Gold Medals awarded were Chetwood's and Collins' B&Q Garden, Diarmuid Gavin's Irish Sky Garden, Jim Fogarty's Australian garden and Sarah Eberle's Monaco Garden.