Annual – blooms quickly in the first growing season but must be replanted the following year. Giant Cactus Zinnia is a must for any cut flower garden. Huge blooms sit atop sturdy stems with spiky petals that are a true conversation starter in the summer garden. This mixture blooms in all shades of yellow, orange, red, pink, and white, making it a versatile choice for any garden style. Plant this easy-going annual in the fall for earlier blooms or sprinkle seed on bare soil in the spring once all chance of frost has passed. Blooms start in early summer and, if deadheaded, can last all the way through fall. Nectar-rich Zinnias are an important food source for butterflies, bees, and other pollinators.