My plant badge (Donnachaidh) is bracken fern. It grows all over the place, and on the back of my property, there is a goodly bit in the low area. I've picker and used it in my bonnet several times over the years, but I find that it wilts pretty fast. At the Stone Mountain Games 10 or 12 years ago, I picked enough for anyone to wear it who might care to, and it was all in pretty sad shape by the late afternoon.

I may go for artificial sometime just to have some around for my collection of bonnets.