What bewildered Maycomb about the yard at the Ewell place?

The people in Maycomb were bewildered by the beautiful, red geraniums in the corner of the Ewell yard.

"One corner of the yard, though, bewildered Maycomb. Against the fence, in a line, were six chipped-enamel slop jars holding brilliant red geraniums, cared for as tenderly as if they belonged to Miss Maudie Atkinson, had Miss Maudie deigned to permit a geranium on her premises. People said they were Mayella Ewell’s."