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Hedges are very popular as privacy fences
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Above is the classic look of a ficus hedge homeowners think of; neat, compact, fully-leaved, clean-looking.
In a few years, without diligent pruning and trimming, this hedge will get out of hand and look like this.
In time, your ficus will get out of hand, like this...
Read this before you buy plants - Here is our article on hedges for the tropics