Hello,
The two books mentioned above are the best starting point. Tristan's is the more recent and more comprehensive. He also has a comprehensive bibliography which you can use if a particular section grabs you. Harold's is a joy, one to have on your shelf. There are others but they will complicate matters.
Note: Tristan is publishing a follow up book in March, the Natural Explorer.
You can get a vast amount of info off the internet now, for free, especially regarding celestial navigation. The NASA links are handy too. I think it best to look at a few of these websites for free at the same time as popping outdoors regularly at night, to observe. Any excuse to get out at night, headtorch, map and compass at the ready. There are free apps for android such as Google sky maps, which make learning a lot easier.
Regarding plants and wind, you need to know local conditions and this comes with observation. As Tristan says, this is art, not science. I think the more we use technology the harder it is to tune in to the subtleties of nature but it is still worth trying. Much overlooked is the effect of the Sun. I think grasping the apparent behaviour of the Sun and thus its influences upon the Earth's surface is the biggest advance we can make in natural navigation.
I am 6'2".
Always more to learn
