I took the advice of a couple of you ladies (thanks to everyone who commented, but thanks especially to Blablover5, Bella, Melissa, and The Professional Bridesmaid) suggest I seal the boutonnieres with something weatherproofing. At that suggestion, I wandered in to Michaels (a place I've never been before, heehee) and purchased a waterproofing spray. I picked up a spray that was for a bunch of things, including flowers and fabric. I figured that would be good enough for silk flowers.
Here's how they turned out:
Here's Wade modelling his boutonniere:
3 hours ago