Cupressus Wilma Ball on Stem

Question from Shoot User

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Hi, I'm thinking of buying some of these trees to give the sunniest side of my garden a bit more privacy from neighbours. The ones I have seen are a ball on stem. Would these grow taller and widen out like hedging? Will I have to keep trimming the stem or will that bush out eventually? New to gardening so any advise is welcome. Thank you!