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A sunflower head is between 4-6" and since it is sterile, no messy pollen Is dropped and the flower lasts longer in the vase.Sunflowers should be sown directly outdoors (recommended), since their long roots need space to develop and cannot be grown in congested environment::After the last frost, plant several seeds together in groups of 2-3 seeds, 1/2" deep. Thin to one plant when true leaves appear::The seeds will begin to germinate in 8-10 days::Sunflowers dislike root disturbance and do not transplant well. Grafts should be kept inside for no more than 4 weeks prior to setting out.SOIL:They prefer loamy and clay soil that have a pH between 5.5 - 6.2. Avoid sandy soil::SPOT:They grow best in full sun or in partly shady areas::TEMPERATURE:They grow best in a temperature range between 21-24°C [70-75°F]::WATERING:Keep seed slightly moist, but not wet. Water regularly to keep the seedlings moist. Avoid overwatering, since this can cause disease.