Winter injury to topiaries?
You don't indicate what species of plant these topiaries are, or what is their level of hardiness. The browning that you see could be from cold air temperatures or it could be from drying out too much in winter's cold winds. For now, it's probably best to take a wait-and-see attitude. The plants may put out new growth when spring arrives. If they don't put out new growth, you should cut out the dead sections. If that completely disfigures the topiary, you may have to cut the plants back completely and start over. Regardless, it sounds as though these topiaries need more winter protection in the future.
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