Description from Knitty.com:

On the body of the sweater, the fresh colorwork and texture are made easy with basic garter and slip stitches and no yarn to carry. The sleeve cuffs are more open than usual so they're easy to put on fidgety hands and will look good at a 3/4 length as the child grows.

The button band looks like the stem of the flower, and another vertical green stripe at the back of the sweater continues the effect from behind. Butterfly buttons complete the storybook garden look. In cotton, the sweater is washable and sturdy, and just warm enough.