[gzread]

There is patent law. Patent law says you can't do the patented thing without the license. Growing the seeds is patented. So you can't grow them without license. This may be so obvious that it never needed to become a notable precedent-setting case.

[tptacek]

Nice of you to axiomatically rederive patent law for us, but this is false. You cannot be sued simply for allowing seeds that blew onto your land grow.

[gzread]

You can for using them commercially.

[tptacek]

Feel free to cite a case where that happened. I don't think you can.