Would this work?
I want to make a tall topiary to sit outdoors year-round in a sheltered full shade location. I've never done a topiary so suggestions are welcome.
I'm thinking of creating a few ball shaped frames out of chickenwire and filling them with soil and then lining them with sphagnum moss. Then I would plant vinca (periwinkle) vines in as many spots as possible and then wrap them around the balls. I don't know what I'm doing for a trunk. I was also thinking about creating little holes all around the topiary which I could use to add seasonal interest to the vinca topiary. (e.g., add short cut flowers in the summer).
Will the vinca really be evergreen in zone 5/6?
Will full shade be acceptable?
Any ideas for a "trunk"?