Answer: Your new hollies are considered moderate growers and you can expect 6-8" of new growth each year. For a fast growing evergreen shrub, you might consider Nandina, or Heavenly Bamboo. It grows to 9' with a 7' spread at a fast growth rate of 12-18 inches per year. English Yew is also a good hedging plant choice and it grows about 12" per year. Hope this information helps!
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