Although it’s known as a weed in many cultures, purslane is a highly nutritious, leafy green vegetable. It’s chock full of antioxidants, minerals, omega-3 fatty acids, and beneficial plant compounds.

After all my tender potted petunias died this summer, I didn’t replace them; it was too hot to bother. When I noticed purslane — a wild succulent — growing in their places, I was very happy. I had ...