I love gardening. It's fun, it's rewarding, and it saves money. However, it's only useful for prepping purposes in the long term if you focus primarily on a self-sufficient garden. If you rely on bags of fertilizer, soil, and seeds every year, grid interruptions and supply chain issues can put a stop to your fun hobby.
We saw the beginnings of this last year with seed shortages. In my area, seed supplies have been better than last year. But I am still always looking for ways to make my property more of a closed-loop. Between using perennial plants, seed saving, and on-site fertilizer production, I have made a lot of progress.
Perennials are long-term investments for a self-sufficient garden.
Rhubarb has been growing for about a month now. My first asparagus spears are just beginning to emerge. I planted one rhubarb crown and maybe seven asparagus crowns in 2014. You can't harvest rhubarb the first year. And asparagus needs to wait for three years before harvesting. But if you have a place in which you plan to hunker down, they're well worth it.