Within one season the various grains and fruit trees that were planted grew to enormous sizes. The fruit trees grew very large with a corresponding growth in the size of the fruit, the fruit was considerably more numerous. The weight of this fruit causes massive damage to the trees with branches breaking in the wind and just shattering from the weight. This also included the grains. Even slight levels of wind would cause wheat shafts to snap.
Over the next few decades this overabundance was reduced to the point where the productivity was greatly reduced causing famines throughout the regions. It took better than 10 decades before a medium seemed to have been met for the introduced plants.
It was also during this time weird plant hybrids combining the native and introduced occurred. These hybrids did not seem to be viable and almost all of them became extinct.