The hybrid system (or FlexStand™ System) is a way of growing pines for multiple markets. One such planting configuration involves a row of sawtimber crop trees next to a row of pines intended for bioenergy. For example, alternating rows of sawtimber crop trees (harvested after 24 years) may be planted between adjacent bioenergy rows that are harvested after 14 years (Table 10.4). In some cases, all seedlings in the plantation may be from the same genetic source while in other cases the genetics will vary by row [10]. For example, each row of sawtimber trees may be of one genotype (grown in containers) while alternating rows intended for bioenergy may be planted using less expensive bareroot stock (perhaps injecting them with paraquat two years before harvest [5]). Spacing for the biomass trees might be 2 m apart within the row while sawtimber trees might be spaced 3 m apart within the row. At some early age (perhaps 11-14 years) all of the biomass rows are harvested. On some sites this thinning might remove 100 green tonnes per ha of biofuel. After the biomass thinning, the remaining pines might be on a 10 x 3 m spacing.