Edible seaweed pods that hold drinking water. Inedible banana leaves around perishable food. 3D printing from corn starch. Diapers made from eucalyptus wood. Small and big companies looking to meet current buyer demand from consumers and retailers, swerve incoming regulatory levers and leverage recent technological innovations are pursuing new (but also, rather, incredibly old) solutions that downplay our reliance on petroleum-based plastics - alternatives that are sourced from plants.