Mammoth Sunflower Flower Seeds

Mammoth Sunflower Seeds | Non-GMO | Heirloom | 15 Seeds Mammoth Sunflower Planting Guide Mammoth sunflowers are a popular choice for gardeners who want to grow the tallest and largest sunflowers possible. These massive flowers can reach heights of up to 14 feet and produce blooms that are up to 12 inches wide. When to plant mammoth sunflowers Mammoth sunflowers should be planted in the spring after the last frost. The ideal soil temperature for sunflower seed germination is between 70° and 75°F. Where to plant mammoth sunflowers Mammoth sunflowers need full sun and well-drained soil. They are tolerant of poor soil and drought conditions, but they will thrive with regular watering and fertilization. How to plant mammoth sunflowers To plant mammoth sunflowers, direct sow the seeds into the ground. Space the seeds 18-24 inches apart. Plant the seeds 1 inch deep. Water the seeds regularly and keep them in a sunny spot. Caring for mammoth sunflowers Mammoth sunflowers need regular watering,