A harvester (10) for crops including biomass crop material (14) and seed heads (16) comprises a base unit (18), a biomass harvester sub-system (20) for harvesting the biomass crop material (14), and a seed harvester sub-system (22) for harvesting the seed heads (16). The biomass harvester sub-system (20) includes a biomass harvester (24) carried by the base unit (18). The seed harvester sub-system (22) is carried by the base unit (18) and operable independent from the biomass harvester sub-system (20), whereby the biomass crop material (14) and seed heads (16) are processed independently from each other within the harvester (10).