Far too many buildings are covered with dead skin. Concrete, steel, wood, metal, brick, bitumen, rubber and vinyl are lifeless materials which can and should have a vegetated outer cladding.  Here's an illustrated version of the podcast.
The exteriors of buildings should be planned, designed and managed for multiple objectives including:
1. Habitat creation
2. Horticulture for growing food
3. Horticulture for aesthetics
4. Apiculture (bee keeping)
5. Surface water management
6. Energy capture
7. Carbon capture
8. Dust capture
9. Noise attenuation
10. Thermal insulation
11. Natural lighting and ventilation
12. Relaxation and wellbeing
Green cladding materials are also beautiful sustainable. 
For an illustrated version of this podcast please see  https://youtu.be/S9R2bXDsY2Y on the Landscape Architecture YouTube channel.