When we arrived in SW France, I discovered two weeds on our veg patch that I'd never come across in UK. They grew amazingly quickly, and I had to tackle them as soon as I saw them, otherwise they would take the place over.
Several years later, I've just found that one of them is very beneficial, and I never knew it! It's called purslane, or pig weed. Apparently it has e.g. more Omega 3 fatty acids than any other leafy plant, and many other positives.
Does anyone else use it? apparently the weed version is better than a cultivated version. But I've been so successful in removing it that i'm going to have to search hard to find it and enable it to grow in one little corner.
Peanuts
