Lizabeth hates the imperfectness of Miss Lotties place, every thing was ugly except for her marigolds. Lizabeth throw rocks with her friends and brother at the marigolds.
When Lizabeth sees her father crying because of how he used to be the rock of the family but because of the depression everyone feels while her mother sings to him. This made Lizabeths whole world crumble.
In Lizabeths anger and confusion she wanted to remake her world perfect once again by destroying Miss Lotties marigolds. Realizing her mistake and understanding why Miss Lottie planted those marigolds because she wanted to have some beauty in her garden. Lizabeth apologized and planted her own marigolds.