People Have Died From Black Locust. Why Is Nobody Talking About It?
I used to think black locust was the ultimate cold climate support species.
Fast growing, nitrogen fixing, drought and cold tolerant, coppices and pollards readily, produces incredibly rot resistant wood that can compete with treated lumber, bees love the flowers, they smell amazing, it thrives in terrible soil, etc. From a biomass and utility perspective, it's basically the perfect tree.
However, the deeper I looked into the toxicity of black locust, the less I started valuing it in my systems. What really surprised me wasn't just the toxicity itself, but how little the dangers are discussed compared to the benefits. Like if you watch videos about it on YouTube you'll only hear things about growth rate, biomass, long lasting fence posts, nitrogen fixation, bee forage, biomass, and resilience. Read plant databases like pfaf and they barely mention the toxicity beyond a short warning line, saying cooking or heat eliminates the danger.
Here's the thing though, there are multiple historical accounts of people boiling young black locust shoots during famines that led to mass poisonings and deaths. Horses or chickens dying after chewing bark or fresh sprouts. Children becoming violently ill after eating seeds or pods. Woodworkers and farmers getting poisoned from exposure to sawdust. Why do you never hear about this and why is it understated, I have no idea. I only found out a few days ago that there are many documented cases of severe poisoning and deaths associated with ingestion of or contact with black locust, and I've been doing this for awhile!
I'm not saying black locust is entirely bad because from a purely functional perspective, it is an absolute monster of a species. But what is the real goal of permaculture?
For me, permaculture is really about permanence, where we create sustainable human settlements. We learn about different agricultural methods in order to create these settlements. With that in mind, our systems should probably be safe no? I don't just want productive systems. I want places where people can exist carelessly without fear. I want children to wander freely, I want guests who know nothing about plants to be safe, I want a place that doesn't depend on everyone remembering a list of dangerous species, and I don't want the stress of wondering whether some black locust got into my animal feed and whether they're going to die or not. More importantly, I want to be able to raise a family without worry.
To me, a truly mature permaculture system should feel almost impossible to misuse, and for the kind of "bulletproof" human habitats I want to design, where people live in permanence and move through the landscape freely and unconsciously, I no longer think black locust really has a place in my systems, except for extreme cases of land regeneration/restoration.