Covering the back of your wedding bouquet holder is another optional step. I like for my bouquets to completely finished and beautiful from all sides. This also covers the mechanics of the bouquet, concealing the fact that the flowers are on a holder rather than a true hand tied.
I do sell greenery in single bunches, rather than requiring a minimum purchase like some wholesale sites. One or two bunches of salal is plenty for design use in a typical wedding with several bouquets, corsages and boutonnieres. Ten bunches or more is only needed if you plan on doing a roomful of centerpieces and large florals for the church.
Use professional floral adhesive to adhere the leaves. Both hot and cool melt glue show up as dark lines because they damage the fresh leaves. Hot glue doesn't do well in a refrigerator, either - it tends to pop and crack off when exposed to refrigeration or moisture.
You can use a variety of different greens (including the leaves you strip off your rose stems). I like the look of salal, also known commonly as "lemon leaf".
The leaves on the stem often twist and turn separate directions. I cut them apart so that I can glue each individual flower separately, showing the face of the leaf rather than the underside.
Be sure to reserve some of the salal leaves back for use in corsage or boutonniere work as well.