Visitors voted Chichester's as their favourite garden out of the six participating colleges. In close second place was Askham Bryan College, who were also awarded a Gold medal and the Best at Show award by the judges in March.
The annual competition, now in its sixth year, is organised by TV gardener David Domoney. It offers students a chance to show their work and celebrate the best of sustainable British gardening.
Each college was given a 5.5m x 4m plot to both plan and design a garden that demonstrated an understanding of harmony and sustainability in an urban location. The show gardens are meant to inspire city dwellers.
Chichester's multilevel garden, with patio and raised beds, is laid out in a spiral pattern that encourages people to walk around the garden.
Rebar fences, arranged in three rows of three bars, run around the edge of the garden, while birch trees give it height. Evergreens including Cryptomeria, Laurus nobilis and Hebe rakaeinsis have been clipped into mounds. Buxus was deliberately left out of the design due to blight issues and its "overuse" in garden design.
David Domoney, organiser of the competition, said: "A delightful win for Chichester College. It is a testament to all of the hard work that the students have put in. They have captivated the visitors of the Ideal Home Show and what a great thing for the students to put on their CV's when they leave college looking to join the commercial world."