Who said why one sprig of nut grass can ruin a whole yard?

Miss Maudie Atkinson said that. Scout asked Miss Maudie why when she found a blade of nut grass in her yard, why she swooped down upon it with a tin tub and subjected it to blasts from beneath with a poisonous substance she said was so powerful it'd kill us all if we didn't stand out of the way. Miss Maudie replied that instead of pulling it up, she blasted it away because one sprig of nut grass can ruin a whole yard. When it comes fall it dries up and the wind blows it all over Maycomb County.