IANAL but it seems especially bad that the verdict was unanimous . I guess it really is time to shutter the USDA, because any pretense that this government supports the farmer, rather than the same corporate interests that all other agencies do, is demolished at this point.
Can't farmers still use non-Monsanto seeds like they could 100 years ago? My grandpa's small family farm has been doing just fine without for decades, after all. I get that we're all supposed to hate Monsanto because they're a corporation (something which they apparently don't have in common with the YC-backed companies), but what's the incentive to develop "superior" seeds if the first farmer who buys them can farm…
Monsanto is somewhat infamous for suing farmers for planting seeds from plants that were accidentally cross-pollinated with Monstanto crops. So to answer your question, you can't use non-Monsanto seeds if any of the farms around you are using Monsanto seeds.