One week in advance, make leaves.
Tape two 18-guage wires together to form stem. Repeat for a total of six stems. Set aside.
Using Leaf Green icing color, tint gum paste medium green. Roll out gum paste to 1/8 in. thickness. Using craft knife, cut out two 7 in. hearts. Using craft knife, cut out grooves in leaves.
Place leaves in cornstarch-dusted curved bowls or containers. Prepare gum glue adhesive following recipe instructions. Brush gum glue adhesive down center of back of leaf; position stem. Cut small strip of gum paste, wet back with edible adhesive, position on top of stem to adhere to leaf. Let dry 48 hours, moving leaves occasionally to avoid sticking to the pan.
Remove from pan; let air dry completely.
Repeat four more times, making two 3 in. to 5 in. leaves and two 6 in. leaves, for a total of six leaves.
Once all leaves are completely dry, dust edges with Spruce Green Color Dust.