Keep an eye on the jewel weeds to set seeds. The seed pods look like a miniature pea pod. The pods are hydro-statically charged and the least little amount of pressure on the outside of the pod make it explode shooting seeds everywhere.
This is great fun with kids (and I have to admit I find it creepy and funny)
Have the kids grab the entire pod in their hand and tell them they can’t let go. As soon as their hand applies pressure to the outside of the pod the pod walls curl up in their hand and it feels like you are holding a live bug.