I spent some time working on a seed swapping startup idea a couple years ago, and it's a fascinating topic. In the UK there is also a law which states you can't sell seeds unless it's registered [1], and out of maybe 4000 tomato varieties the government has approved only a handful.<p>This is terrible for diversity because as the climate change get worse, some tomato varieties might thrive better than others in heat, or drought, or have different disease resistance... but because they are illegal to sell the seeds it's difficult to keep the different species alive and we could run into trouble in the future when we realise these government approved varieties don't work in warmer or colder climates.<p>There is some valid reasoning for the law... because you don't want a farmer to purchase 100,000 bad seeds and have his whole yield fail on his farm.<p>Those laws may not exist in other countries but the patents could stop diversity in the same way, but long term it's important to keep these weird varieties of seeds around for diversity.<p>[1]: <a href="https://www.independent.co.uk/life-style/food-and-drink/features/forbidden-fruit-5353568.html" rel="nofollow">https://www.independent.co.uk/life-style/food-and-drink/feat...</a>