The Dig the City festival, which runs until 6 August, has seen 22 temporary gardens take over the city's central shopping district.
The judges, celebrity gardener Diarmuid Gavin and the National Trust's city gardener in residence Sean Harkin, have awarded seven gold, eight silver-gilt and seven silver medals to the show's gardens.
Best in Show went to Turton Tower Kitchen Garden Group, which created a sensory garden made entirely from materials scavenged from their kitchen garden, friends, family and neighbours. It features climbing plants scaling a lamppost and containers ranging from tin baths to handbags containing bright herbaceous plants, colourful vegetables and grasses.
Turton Tower's Anna Harvey said: "I was stunned and absolutely thrilled on behalf of all the volunteers. All the planting was from our kitchen garden at Turton Tower. It was a lot of work, but we all really enjoyed the experience. In the end, the plants did their stuff and the garden, entirely scavenged of seeds and a material was a huge success."