The three winning designs are a garden which highlights the work of the Perennial charity, another that will eventually flourish at a children's hospice and a third that will encourage visitors to support the work of the NSPCC.
The winning designs will be created at the national gardening and outdoor living show, which takes place from May 30 until June 1 at The Royal Highland Centre Edinburgh.
The teams behind the submissions have each been awarded £2,000 to help them turn their plans into flower-filled show gardens, which will be seen by more than 35,000 visitors at this year's event.
The winners include husband-and-wife design team, Amber and Martin Crowley from Oban with the 'Perennial Garden', Dundee College with 'The Retreat' for CHAS and SRUC Ayr for NSPCC Scotland's Garden of Childhood Adventure.'
Waterfalls, banana trees and giant steel arum lilies are amongst the elements that will feature in the gardens, which will be on display with 10 others in the David Wilson Homes Show Garden Avenue.
The award has been developed in order to encourage designers to create exhibits that reflect real gardens and it is being supported by The Cross Trust, a charitable body, which also administers the annual John Fife Travel Award for young horticulturists.
The competition is also supported by Gardening Scotland’s own Fred Last Award programme and by members of the former Lothian Horticultural Training Group.
Gardening Scotland show organiser Martin Dare said: "The feedback from our visitors has been that they want to see gardens that they could conceivably create at home and while the designs for the winning gardens are exceptional, they are all on a domestic scale and are full of features that will delight and inspire those who see them."
In total, 12 gardens will be created in the David Wilson Homes Show Gardens Avenue at the event. The show will also host the biggest plant fair in Scotland in the New Hopetoun Gardens Floral Hall, and gardening advice from the Royal Caledonian Horticultural Society and the RHS.
More than 400 exhibitors are expected.