These gigantic flowers can be up to 10 inches across and have bright yellow, feathery petals with a brown center. Flowers are attractive to honey bees, wild bees and other pollinators. Grey Stripe Sunflowers are the tallest sunflowers of all varieties, steps up to 8 -12 feet tall Large Pack of premium Open-Pollinated, Non-GMO, USA Grown seeds Adapted to a wide range of soil types but prefers well drained soil with a ph of 6.5 - 7.5 Low maintenance and fast growing, exellent choice for the back of perennial borders Mammoth Grey Stripes' large size make them a great choice for scattering throughout the meadow, using as a background or privacy screen, and creating a childs first garden. Massive seed heads are good for harvesting and roasting or leaving in place to feed birds. To plant Grey Stripe sunflower seeds, direct sow them outdoors once the danger of frost has passed, planting them 1 inch deep and spacing them 6-12 inches apart in well-drained, rich soil; ensure the soil temperature is between 65-85°F for optimal germination, and water regularly to keep the soil moist until seedlings emerge; consider using bird netting to protect seeds from animals while they sprout.