I just found this interesting plant in my garden today. Can anyone tell me what it is (or could be)? It has cute, heart-shaped seed pods and grew to about 8", give or take, in my yard. There didn't appear to be others of the same plant nearby for help IDing, but I suspect it's a quick-to-set-seed weed of some sort.






Backlit by the sun to see the seeds:

I wonder if it could be Lunaria of some sort?

Lin, how interesting! I hope it is Lunaria, that's a pretty little plant. I don't recall seeing that bloom in my garden, but that doesn't mean that it didn't; the bigger thing, though, is that the plant I have has about 10 seeds per pod (Lunaria appears to have about 4-6) and they are shaped a little differently. I think you're onto something, though. Maybe it's just a different type of Lunaria? Or maybe it's a different plant that's a close cousin?...

In researching lunaria, I'm noticing that lunaria seed pods seem to always droop. This plant holds the seed pods very erect, no drooping whatsoever.

Can you get some photos of the leaves close up as well as the entire plant?

Its Field Pennycress (Thlaspi arvense)

Daisy, that's it!!! Thank you! I've seen that flower in my garden before, too, so I feel pretty certain.

According to a website I found, pennycress is edible, has leaves that taste like cabbage--though bitter--and seeds that can be used as a mustard substitute.

Here's our entry for it, it's needs a bit more detailing.
Field Pennycress (Thlaspi arvense)

I understand that the seeds are peppery. Taste a couple and let us know...