Benary's Giant White Zinnia is a stunning heirloom annual that brings crisp, snow-bright elegance to cutting gardens and classic arrangements. Large, fully double blooms on sturdy stems reach 36 to 48 inches tall, blooming reliably in 60 to 75 days from seed. This is a workhorse of a flower, prized as much for its practical vigor as for its timeless beauty. Plant it in full sun (6 to 8 hours minimum) and warm soil between 70 and 95 degrees Fahrenheit, spacing plants 9 inches apart for optimal air circulation.
Full Sun
Moderate
2-11
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The fully double blooms are architectural and abundant, with petals layered so densely they create a dome of pure white. Sturdy stems make these flowers exceptional for cutting, holding their shape in a vase far longer than typical zinnias. The plants are remarkably vigorous and reliable, springing to life in just 4 to 6 days under proper warmth and consistently flowering until frost.
These tall zinnias are cut-flower specialists. Florists and gardeners prize them for bridal bouquets, classic arrangements, and long-stem vase work where their sturdy stems and large blooms command attention. Home gardeners grow them specifically to fill summer arrangements with homegrown abundance.
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Sow seeds indoors 4 weeks before your last frost date into 72-cell flats or preferred seedling containers. Cover seeds completely and maintain soil temperature between 70 and 75 degrees Fahrenheit; a heat mat will accelerate germination to 5 to 7 days. Keep soil consistently moist but not waterlogged. Avoid allowing seedlings to become root-bound, and handle transplants gently, as stress can cause double-flowering varieties to temporarily produce single blooms. Harden off seedlings gradually before moving them outdoors.
Transplant seedlings outdoors after the last frost date when soil has warmed to at least 70 degrees Fahrenheit. Space plants 9 inches apart. Handle roots carefully during transplanting to minimize shock and maintain flower doubling.
Direct sow seeds 1/4 inch deep into warm soil after all frost danger has passed and soil temperature reaches at least 70 degrees Fahrenheit.
Cut stems early in the morning after dew has dried, selecting blooms that are fully open but still fresh. Use sharp, clean scissors or pruners to cut stems at least 12 inches long. The fully double blooms will continue opening in the vase, reaching their peak display within a day of cutting. Flowers last 7 to 10 days in a vase with fresh water and a floral preservative.
Deadheading spent flowers encourages continuous blooming and keeps plants looking neat. Pinching the center of young plants when they reach 6 inches tall will encourage branching and fuller shape if earlier, bushier plants are desired.
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