- You will get 100 Seeds of California Giants Zinnia Mix Flower Seeds. - Sunlight: Full Sun. - Life Cycle: Perennial. - Watering: Medium. - California Giant Zinnia Flower Seed Mix!. - Easy to grow with powerfully bright colors guaranteed!. - Seed coverage: 40 seeds per square foot. - Adding giant zinnias in your garden will add tremendous color color and attract butterflies to your property. Giant zinnias make excellent cut flowers, lasting for at least 4 days in a vase. Giant zinnias are sun-loving plants (in zones 9 and above avoid mid-day sun) that reach heights of up to 4 feet. Five-inch blooms with layers of rectangular petals are the defining characteristic of these easy-to-grow annuals. Bloom colors include brilliant oranges, pinks, yellows, reds and whites. - Germination: Sow seeds 1/4 inch deep and in rows spaced 4 to 24 inches apart, or 40 seeds per square foot for mass plantings. Plant in well-draining soil and keep consistently moist for 2 weeks. Once established, plants have medium to light watering needs.