Kathy Willis examines the origin and impact of Dutch elm disease across Europe.
Prof Kathy Willis examines the mystery of a plant's ability to exist in multiple forms.
Monty Don finds out if national parks are good for wildlife.
Kathy Willis explores the harnessing of plants' ability to photosynthesise their own food.
Tom Heap meets the critically endangered rock iguana of the Caribbean.
Snowdonia's slate once roofed the world. Find out what has become of the quarries today.
Prof Kathy Willis explores the discovery of new laws to create plant hybrids.
Prof Kathy Willis examines how one man's flower was turning into another man's weed.
Prof Kathy Willis examines Charles Darwin's use of orchids as a scientific tool.
Prof Kathy Willis explores the smuggling of rubber seeds from South America.
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