Hi Lynne...I pack the body of my topiary with a mixture of one part soiless potting mix and 2 parts sphagnum moss. I pack the body but leave a hole to put the plant in and surround this with the mixture above. If you are not putting a central plant in the body of your topiary then pack the body as you did the rest of it and then poke holes to add the single stems and pack the mixture around the stems. If you are just using the moss that's ok too, but you will need to pack the body the same way. The general rule is the smaller the topiary the smaller the leaf size, with a larger leaf you can miss some of the detail. Good Luck and Have Fun!!!

See my photos of Portfolio at PhotoPoint

Let's see if this link works, It is a life size topiary of a woman we have come to call 'Buxom Bottom Busty Betty"
Sculpted from chicken wire in one saturday afternoon, planted with creeping fig.
There are two rebar stakes in side the chicken wire frame keeping her 'straight' ... At first we called her I-lean.