It's called the Plant Reproductive Material Law, and it attempts to put the government in charge of virtually all plants and seeds. Home gardeners who grow their own plants from non-regulated seeds would be considered criminals under this law.
The draft text of the law, which has already been amended several times due to a huge backlash from gardeners, is viewable here.
"This law will immediately stop the professional development of vegetable varieties for home gardeners, organic growers, and small-scale market farmers," said Ben Gabel, vegetable breeder and director of The Real Seed Catalogue. "Home gardeners have really different needs - for example they grow by hand, not machine, and can't or don't want to use such powerful chemical sprays. There's no way to register the varieties suitable for home use as they don't meet the strict criteria of the Plant Variety Agency, which is only concerned about approving the sort of seed used by industrial farmers."