Fire up the hot glue gun again. Using a mix of lichen and foliage foam, start hot-gluing foliage to the wire “branches”. You could glue real twigs in too, or add some plastic trees to the mix if you want more height to the hedges. I’ve left this batch fairly low, they’re very roughly chest-high to a 28mm model, with some sections head-high or better and rare breaks lower than that.