Answer: Your plants will continue to put on new growth and will become as large as you allow them to become. To maintain the shape, plan to do a little pruning each spring, cutting back the tops by a few inches. This will encourage lush, new growth and help the ball shape remain dense. Check often for swollen buds along the trunks of your plants and rub them off when they appear (or you'll have branches there!) Best wishes with your topiaries.
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