Questions of supplies have raised other thoughts - what are the ethics of post-apocalyptic survival? Particularly in regards to preparation
For example, I've been looking into various plants that I could get, as well as thinking about those that are a lot more difficult to get...
The easily obtained, legal plants aren't a problem - except when it comes to watering, fertilising, ensuring they get the right light, are grown with the right temperature regime. In an underground shelter, that all obviously harder than it sounds. Seeds are good - but take a long time to grow to into productive plants. And a tree that needs a couple of hundred hours of chill to set fruit and one that is frost sensitive are difficult to grow in the same region.
But... of more interest are the plants that are difficult... Cannabis sativa is an obvious one. Its fibre is suitable for ropes, clothes, making plastics, yet most people consider only the pharmacological use. Or Papaver somniferum - again, anyone attempting to get some gets questions from various authorities or, worse still, visits from local... special interest groups wanting to take possession, with or without your acquiescence. Never mind your efforts to keep enough alive and growing for future use.
Let's face it - even Nicotiana tabacum is legal to have (prepared), legal to consume, but in most places illegal to grow. Even if you have a specialised interest in gardening... It may not be the most obviously useful plant, from a restarting society point-of-view, but it's definitely an important one. It has more use as an item of trade than anything else, particularly when you need resources that you would have to spend time and energy trying to acquire - especially if you'd have to fight for them otherwise...
So... the questions of - how ethical is it to break the law for a circumstance which might not (in the eyes of most people) happen?