Using 26 gauge wire, you'll find it flexible enough to bend and manipulate easily, yet stiff enough to pierce through flower heads without difficulty.
Covering mechanics is the sign of a good floral designer. Tape the wire down with floral tape, pulling and stretching as you wind it down the wire.
If the tape is pulled tightly, it will cling to itself and not become unwound as you use the wire.
Form an open loop with the taped wire and tape the bottom ends together.