zinnia seeds for planting outdoor each pack (2000+) seeds mixed colors garden youth-and-old-age cut flowers seeds hua xian zi zinnia produce stems as tall as 4 feet with huge 5" blooms, making this variety ideal for cut flowers! the shape of the flower is a bit more open than the dahlia flowered variety, with petals rounded on the end. easy to grow, zinnia look wonderful when planted "en masse". plant zinnia california giant flower seeds in full sun, in beds and borders for a bright and colorful garden. and then, the more you cut, the more they bloom! besides being a sea of color, it is also a hangout for butterflies, hummingbirds, and assorted flying insects.