The closing date for gardens to apply is the end of February. Last year involved over 200 London gardens, including a range of spaces not usually open to the public and with historical, design or horticultural importance.
Event co-ordinator Robin Saklatvala said: "We are delighted with the amazing success of the 2012 weekend and are looking for new and interesting gardens to build on this in 2012. The amazing variety of participating gardens reflects the diversity of the capital’s population, culture, history and environment."
Private domestic gardens are not included in the event as these are well represented under the National Gardens Scheme.
The weekend is an initiative of the London Parks & Gardens Trust and aims to raise awareness of London’s green historic and other garden spaces.