I actively grow for a local charity that installs food-producing plants in low-income neighborhoods. The poor do have disproportionate health problems resulting from diet. When a quart of seaberry juice costs $18, I can't afford it, and someone in subsidized housing living off of fast-food dollar menus sure as hell can't. I'm generally against state-run welfare systems, but I can't in good conscience advocate for their defunding without offering a better alternative solution. Though I believe the dependence on those welfare systems is illegitimate in many cases, people are nevertheless dependant on them. Until that dependence is broken, those systems will only continue to expand. This is just the one alternative idea I'm able to meaningfully contribute towards.
Food is the highest expense of living, and medical care for disease brought on by poor nutrition is a close second. Our admittedly lofty goal is to get 10% of those below the poverty level to the point where they can eat from their gardens 1 day a week.
What I've discovered though, many of the people we plant these for haven't the time, experience or interest to maintain the plants. The group did a few hundred apple trees about 5 years ago, and maybe 10 of them are still alive today. So to move forward, we need perennial plants that grow easily, aggressively, and are very hard to kill. This hits all the criteria. Rugged, accepting of abuse and neglect, nutritious, and would normally be beyond the financial reach of the people we're planting them for. The nitrogen fixation is also a nice bonus, as the soil in many of the older city lots is so depleted, it requires major remediation. These will grow in anything.
Also, we need to scale up to get NPO status, which will make my donations tax-deductible (They technically are now, but it's contentious). I can turn 1 plant into 20 in two years, so it's a low-cost way to get thousands of plants out there, and move enough value through the organization that we can make a case for a legitimate non-profit status. I'm not really involved with that part of it, but will do my part as one of the growers... a tax break is always welcome, lol.
RE: Cold Climate Permaculture Plants: Sea Buckthorn