Users can also view a selection of greener gardening videos, such as how to compost, and access other handy gardening hints and tips.
Developed by the Trust’s in-house team, the free app is available to download from the iTunes app store at:
In addition to all the free garden information, users can also download an individual garden guide to Stourhead in Wiltshire, including an interactive map of Stourhead featuring some of the most interesting plants, plus points of interest in the garden, such as the famous Palladian Bridge. The app also includes an augmented reality experience of the Stourhead garden which will identify different species of shrubs and trees, and their distance from you, even if they are slightly obscured from view.
More than 20 more detailed garden guides will come on stream over the next 12 months in the same format, including Cliveden, Hidcote and Waddesdon.
National Trust gardens head Mike Calnan said: "The app is a fantastic new way to explore our iconic gardens.
"It is easy to use and packed full of useful information and beautiful imagery giving users a tantalising glimpse of what they can expect.
"We hope it will encourage people to visit National Trust gardens more frequently and to explore some of our less well known properties."
The garden app follows the launch of the National Trust iPhone app last year. This app is number one in the top 10 travel app chart and has a 4.5 star rating. To date it has been downloaded over half a million times.
Emily Heaver, head of digital content and user experience at the National Trust, said: "Focussing on one particular subject has allowed us to really explore the interactive possibilities of mobile apps and how they can enhance a visit or inspire people in their own gardens.
"We are lucky at the Trust to have access to teams of experts in many fields and we want that passion and knowledge to be at everyone's fingertips. We are already excited about developing similar apps for subjects such as wildlife and art."