To hold the silver mesh in place, I'm stitching over it in sating stitch around the edge; the double row of split stitch forms the extent of the satin stitch, leaving as much of the mesh exposed as possible.
The roots first:
Stems and most of the leaves:
The large single leaf:
My stitching looks terrible in the photo - the light seem to catch everything and makes it look much worse than it does in reality. Or I think so, anyway - you'll just have to believe me!
I'll do the snowdrops themselves next.