Tulip flower heads
The Netherlands is famous for its tulips. After flowering the tulip heads are cut off and wasted. Growers sometimes even pay to get rid of them. Yet, they are a valuable resource in other sectors. For example, they could be converted into pigments for paint. 800kg of pigment can be retrieved from from one hectare of land. This leads to a total market in the Netherlands of all tulip field of 1,5 trillion euros in pigments.