If there are a lot of people who want to propagate a rare plant... especially easily accessible ones in open-to-the-public gardens... not all people will wait for a leaf to fall.
Also, if you're in a private place (such as a plant nursery or a supermarket), you don't have a right to a dropped piece - everything of the shop belongs to the shop, even if you think they'll treat it as rubbish. If a bolt falls out of the display racks, you can't just say "ooh, free bolt on the floor, I'm keeping it", you know?
For most plants, taking discarded material would be fine, but they have some rare plants that are subject to international diplomatic agreements - to paraphrase, "we will give you a specimen of this plant, usually in exchange for some other favour, but only you may grow it". If those get loose, it can spark an incident and potentially cause that international cooperation to cease.
These kinds of agreements sometimes happen for countries where previous expeditions have taken commercially valuable crops home and built an industry around them - e.g. the British stealing rubber tree seeds from Brazil in 1876, in order to set up competing plantations in south-east Asia.
And of course it's difficult to know which plants are covered by something like that, unless you're very up on your international botanical politics and are extremely good at telling similar species apart.
AFAIK — I’ve stolen many a cutting from my apartment complex (like, 3) but never tried roaming Home Depot.
Also the whole “endangered” bit is just distraction, IMO. Even if these plants were endangered, why do we care about them in particular…? Just because they’re pretty? They’re native to islands in Southeast Asia, I don’t think anything we do to plants in America will change their status — other than supporting poaching industries ofc, which is also a fascinating problem in the aquarium/fish community.
The data hoarding community seems to have a similar mentality sometimes. Collecting petabytes of media will not somehow
The facts were:
1. There was a notice on the outside of the box saying that use of the product was subject to an EULA. Zeidenberg was not bound by that.
2. Zeidenberg opened the box, opened the CD case, put the CD in the drive and ran the software installer on the CD, which presented him with the full EULA and the opportunity to agree to it, or the opportunity to cancel and return the software for a refund. He clicked "Agree" to that.
It was the clicking "Agree" after having a chance to review the EULA that bound him to it, not opening the packaging.
Also, if he was not offered the opportunity to disagree and return the software, it would not be binding.
It's unlikely it will ever be legal to claiming someone's actions before they've been presented the full license text count as assent to said license.
It is, however, possible to patent genetic modifications in the UK (and the EU), and for the duration of the patent, require anyone growing plants produced from those modifications to buy a (compulsary) license from you.
https://en.wikipedia.org/wiki/Directive_on_the_legal_protect...
But ecological disaster can form from careless/reckless plant reproduction. Some balance has to be struck.