Answer: Nandina (Heavenly Bamboo) will grow happily in containers and their dense growth habit will block wind and reflect noise, providing a sense of privacy on your patio. The only problem with Nandina is its painfully slow growth rate. If you purchase 4' shrubs, you'll have instant results. If you purchase smaller plants, it will take several years for them to reach mature heights.
Other shrubs suitable for the conditions you describe include Dodonaea viscosa (hop bush), Escallonia, Photinia fraseri, or Abelia grandiflora. All have reasonably rapid growth rates and all can be pruned to keep them at 5'-6' in height. Hope these suggestions help!
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