Answer: In your mild climate many vines will grow year around, which will help you cover your block wall in a hurry. Whether or not a vine will prevent traffic (people or paint) remains to be seen. Sometimes it's a deterrent and sometimes it is not. Fast growing vines for your gardening region include Bougainvillea (most have thorns), Distictis, Muehienbeckia (Mattress Vine), Petrea (Queen's Wreath), Tecoma (Cape Honeysuckle) and Rhoicissus (evergreen grape). You might also consider groundcover roses (Rosa Rugosa) or Pyracantha. Both trail and should cascade over the wall.
Best wishes with your new plants!
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