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This undated photo from Crystal Cruises shows a freestanding vertical garden, which is a plant-covered “living wall,” on the Crystal Symphony ship. The Symphony launched in September 2012. The living wall was a first at sea for the cruise industry and it’s one of a number of new attractions and activities being offered as the 2013 season gets under way. (AP Photo/Crystal Cruises)

Associated Press
This undated photo from Crystal Cruises shows a freestanding vertical garden, which is a plant-covered “living wall,” on the Crystal Symphony ship. The Symphony launched in September 2012. The living wall was a first at sea for the cruise industry and it’s one of a number of new attractions and activities being offered as the 2013 season gets under way. (AP Photo/Crystal Cruises)
This undated photo from Crystal Cruises shows a freestanding vertical garden, which is a plant-covered “living wall,” on the Crystal Symphony ship. The Symphony launched in September 2012. The living wall was a first at sea for the cruise industry and it’s one of a number of new attractions and activities being offered as the 2013 season gets under way. (AP Photo/Crystal Cruises)
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