Plants: From Roots to Riches (BBC Radio)
Excellent podcast series on interactions between plants and people
Our changing relationship with plants over the last 250 years - from tools to exploit, to objects of beauty, to being an essential global resource we have to conserve. Presented by Prof Kathy Willis from Kew Gardens.
There are 30 15 minute episodes you can listen to online or download (and even on on "A Useful Weed" - Arabidopsis thaliana!)