The "plugs" are generally a bocking variety, meaning their seeds are sterile, and they are a genetic line created back in 1950's (through good old fashioned selection no gmo voodoo) for fodder and sterility. The seeded variety is the "old fashioned" kind it will spread by seed and rootings, it is also higher in the alkaloids it is known for, the fodder bocking variety ( #4) has less alkaloids. Bocking 14 is known more for composting. The biggest "nutritional" difference between old fashioned seeded and bocking 4 is the amount of alkaloids
Europe has used the traditional seeded kind as animal fodder for centuries.
Europe has used the traditional seeded kind as animal fodder for centuries.