The cheerful shasta daisy is a classic perennial. It looks similar to the familiar roadside daisy but has larger and more robust blooms. Shasta daisies tend to bloom in clumps from 2 to 3 feet tall and 1 to 2 feet wide. They bear all-white daisy petals, yellow disk florets, and contrasting glossy, dark green leaves. Like clockwork, shastas return every spring or early summer and bloom until early fall. They are never invasive (like some consider roadside daisies to be) and they are terrific for cutting.