Greening pins (aka Mossing pins, fern pins, or U-pins) are used to attach moss, leaves, foliage, bark or other greenery to floral foam or styrofoam. Greening pins are mainly used to anchor green sheet moss to its floral foam base.
How do you use greening pins?
Simply push these steel "S-shaped" pins through your moss and into the floral foam. The pins should be deep enough that you can barely see them. Since the ends of these pins are cut at an angle, they are very easy to use with ribbon, bark, moss, and harder material surfaces.