iScape is a popular app that can be downloaded on Apple and Android devices. There is a free version as well as a paid version. You can begin by uploading a photo of your landscape and then select from a library of plants to design the area.
To keep track of the maintenance for your landscape one option is to create a spreadsheet with each plant species listed in the left column and the months of the year across the top. In the box next to the plant name include the care needed for that specific month. Once this chart is created it will be easy to update as plants are added or removed from the landscape. (Alex Stanton, HNR Graduate Student)