Sunflowers are a high-yielding broadleaf cover crop that grow quickly and outcompete weeds, and the seeds they produce are also the most popular seed for bird feed. Peredovic Sunflowers grow 4-5 feet tall, the flowers attract butterflies, bees, and other beneficial insects, and the seeds provide a nutritious high-energy food source for birds. All types of sunflower seeds originate from the common sunflower, Helianthus annuus, though there are many specialized and hybrid flower varieties that create different bloom sizes, stalk heights and seed yields. The seeds they produce are similar, however, and sunflower seed is universally popular birdseed. Recommended seeding rate: 40 lbs/A.