Answer: The denser the growth habit, the more noise shrubs can block. With that in mind, here are a few suggestions for replacements for your oleanders: Photinia fraseri, Elaeagnus (silverberry), Dodonaea 'Purpurea' (purple hop bush), Escallonia, Rhamnus 'Columnaris' (tallhedge buckthorn), Osmanthus heterophyllus (holly leaf osmanthus), Vibrunum or Thuja occidentalis 'Fastigiata'. These shrubs are used quite often as hedging material; all take well to pruning if it's a neat, well-maintained look you're after, and all (except the Thuja) produce seasonal flowers for added interest. Good luck with your new hedge!
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