Thanks, mhof86, DC, and SLIMBOB.
DC, I'm kinda curious myself about the durability of the leaves under the Tru-Oil finish. I almost went with sprayed poly, but I thought I could add a coat of it after the Tru-Oil cures a bit. So far, it's staying on and staying green.
mhof86, fyi, I dried the leaves first, removing the moisture by placing them between two sheets of paper towels and ironing them. I glued them to the bow using Titebond II, carefully flattening them and squeezing out excess glue. The leaves are fragile in this state. After the glue dried, I applied Tru-Oil to the surface of the leaves with my finger. On the leaves you have to rub the oil in the direction of the veins. I woke up one morning with the idea but couldn't find any info on how to do it. So, this is an experiment.
G.