Russ, great scene, looks so cold! I still think you can use the white grout on the trees, next time, dunk the trees in water, sprinkle on your grout, but then afterward, spray on some Scenic Cement or spray on some white glue/water over top, and then add a little more grout, it should dry really hard, and shouldn't crack or fall off?
"There you go with those negative waves again!"