Thanks all! This is growing at my home in West Newbury, MA. I think it's pretty common around here but I never looked closely at the plant before it flowered before. I'll probably let some of it grow if it doesn't interfere with the other plants around it. We bought a new home and are discovering the perennials that came with it as they come up!

Abid, did you pull one up and look at the seed? I may be imagining it but there is something which looks like a sunflower seed visible on the soil surface in your photo. Just left of centre next to the pale clod.

It's a Peace Lily, aka Spathiphyllum, looks pretty happy in your care. Good find.

The crushed leaf didn't have a discernable smell, Nicole. I'm glad I didn't sniff too hard, because I'm so allergic to the nightshades. Can't be in the room if someone is peeling potatoes. I never heard of Shishito peppers, Bob, so I looked them up. The name would make sense, but the leaves look narrower. We'll let them keep growing--after I get them off my porch and onto my son's--and I'll report back when the flowers have produced some fruit. Thank you!