The annual awards were organised by TV gardener David Domoney in association with The Prince's Foundation for Building Community.
Students from six horticultural colleges - Askham Bryan, Writtle, Pershore, Chichester, Capel Manor and Shuttleworth - went head to head to create sustainable gardens at the Ideal Home Show.
The gardens were built over six days and judged by a panel of industry experts including Alan Titchmarsh, HTA chief executive Carol Paris, Simon Sadinsky from The Prince's Foundation for Building Community, and former Garden Media Guild chair Deborah Stone.
Each college was given a 5.5m x 4m plot, to design a garden that demonstrated an understanding of harmony and sustainability. The show gardens were meant to inspire city dwellers, showing all that can be achieved in urban locations. They were intended to create a sense of tranquillity and sustainability for homeowners to act as an escape from the pressures of inner city life and bring a touch of nature to the heart of the metropolis.
Askham Bryan's garden is a compact urban garden with a contemporary woodland theme. It uses rustic timber fencing, traditional stone walling, and a water rill. Varied planting includes woodland varieties and pastel shades, with evergreen structure coming from sarcococca.
The show gardens will inspire visitors to the Ideal Home Show - which runs until April - with clever ideas they can try at home. Around 250,000 people visit the home show; they will be able to vote for the People's Choice Award.
This year Domoney actively encouraged diversity of design, promoting smart use of features such as lighting. The Prince's Foundation has also added an educational element to the brief, asking the teams to think of ways to make their designs educational and allow other young people to reconnect with nature.
Domoney said he is "immensely proud" of the gardens, created by the "landscape stars of the future".
"The careful planning, hard work and effort that goes into each of the show gardens is truly inspiring, and Askham Bryan College's garden highlighted to the public just what can be achieved in such a small urban space."
Judges described Askham Bryan College's winning show garden as a breathtaking example of how to use woodland and comtempory design in harmony. The garden was supported by Green-Tech, Natural Paving and Hortus Loci.
Askham Bryan College - Best in Show and Gold Medal
Pershore College - Gold medal
Chichester College - Silver Gilt
Capel Manor College and Shuttleworth - Silver
Writtle College - Silver