The Society of Garden Designers (SGD) has joined forces with the RHS and the publisher Dorling Kindersley to run the free Great London Garden Trail.
On May Bank Holiday (3 May) 10 private gardens created by designers including Andy Sturgeon, Andrew Wilson and Charles Rutherford will open to the public for the first time.
The second annual Great London Garden Trail will celebrate the launch of the latest RHS title, How to Grow Practically Everything.
Last year's trail attracted 5,000 visitors.
Visitors can pre-register for this year's trail by visiting www.dk.com/gardentrail.