Secret History of the British Garden
Monty Don presents four one-hour programs on each of the 17th, 18th, 19th and 20th centuries. It's a perfect combination of history and gardening. If you love gardens, this is absolutely wonderful. I just had to share it with everyone. He is such an enthusiast. You can find them on YouTube at the links below.
17th Century https://www.youtube.com/watch?v=ZbE99baeJtk
18th Century https://www.youtube.com/watch?v=wCRG555CB-Y
19th Century https://www.youtube.com/watch?v=1oxIQARyL-U
20th Century https://www.youtube.com/watch?v=rkLWcuWnhkM
The New American Garden
James van Sweden (designer of Tippet Rise in Montana) in a 3 1/2 minute video talking about this design concept which started in 1981.
https://www.youtube.com/watch?v=klq_tjgrhy4
The Garden Design Journal (The journal for the Society of Garden Designers)
This British publication has some truly stunning pictures, (look at the Jencks' earthworks in Scotland and Tippet Rise in Montana) as well as ideas for private gardens, wildlife havens and interviews with leading designers.
https://www.gardendesignjournal.com