The petals of bright fabric flowers twirled in the breeze as people gathered in the courthouse square Saturday afternoon. Missy Pflughoeft, co-chairman of Barton County’s Walk to End Alzheimer’s, said the colors in the “Promise Garden” had distinct meanings.A person carrying a blue flower has Alzheimer’s or dementia, a person with a yellow flower is supporting or caring for someone with dementia. Orange means, “I support the cause of the Alzheimer’s Association.”And purple represents someone who has lost someone to the disease.For this garden, however, 2-year-old Owen Koch was asked to hold up a single white flower as a symbol of hope.