The seeds are usually ready for harvest 30 to 45 days after the flower opens, but that depends a lot on the weather. If broadcasting, plant about 25 pounds per acre. To ensure pure seed, grow your sunflowers at least 1/2 mile from any sunflowers grown by your neighbors. Planting sunflower seeds. Contact with the potential buyer of sunflower seed in your locality. Plant seeds and then use a cultipacker to put them at the appropriate depth. Sunflowers can be sown directly into the ground. You have to start with a variety of sunflower that can grow tall. Sunflower leaves, stems and seeds release substances that inhibit the growth of certain plants. Don’t plant too thick, as too many plants will grow and competition will result in a lesser plot. A plant population around 50,000 to 75,000 plants per hectare is considered as the best suitable for producing maximum depending on the water availability and sunflower cultivar. Conventional wisdom says that the seeds should be either direct seeded after danger of frost, or, in short season regions, started in pots a few weeks earlier, for later transplanting. Cover the sunflower seed with dirt. The Best Time to Plant Sunflower Seeds. Step 2 — Plant Sunflower Seeds. The sunflower (Helianthus annuus) grows well in U.S. Department of Agriculture plant hardiness zones 1 through 11. Press down firmly. Sunflowers seeds run approximately $25 per 10 pounds of seed. Plant the seeds no more than 1 inch deep and 6 inches apart. Harvesting Sunflower Seeds. Fix your sunflower farming budget. Sunflowers (Helianthus annuus) grow up to 8 feet tall with some cultivars reaching heights of 15 feet. That’s why grass may die beneath your sunflower birdfeeder. This is the most important tip: genetics matter! Gently push the sunflower seed into the soil. If drilling, plant approximately 20 pounds per acre. Sunflower Farming Business Plan. The plant produces a large head of seeds that can be saved for planting the following season or … You can plant sunflower seeds directly into the ground after the danger of Spring frost has passed and the soil is thoroughly warmed (soil temperature of 55 to 60 degrees F). This is from mid-April to late May in the Northern United States. How to Plant Sunflowers: Place the sunflower seed in the ground. Also calculate post-harvesting cost like storage, bagging, etc. Also, a proper seed treatment is to be carried out for better germination of sunflower seeds So, that you can achieve a good plant density. This allows you to grow your favorite sunflower varieties each year without the expense of new seed stock every spring. First, fix the land area where you will grow a sunflower. These toxins are harmless to people and eventually break down in soil. Sunflower seed heads make plants top-heavy and easily toppled with strong winds. Calculate the expenses of seed, fertilizer, nutrients, pesticides and labor costs. Determining when sunflower seeds are ready for harvest can be tricky. Forget the dwarf varieties (which do great in containers), and look for types with words like giant, mammoth, kong, tall, monster, and so on in the either the seed name or description. Most sunflower varieties need 95-110 frost-free days to produce mature seeds, which means they can grow in zone 5 and warmer. 1 Choose the Right Seed. Below is a photo collage of my mother showing us exactly how to plant a sunflower seed directly into the ground with her experienced gardening hands. Always hoard a small number of the sunflower seeds that you’re setting out. These annual plants are tall, with a height of 8 to 15 feet. Slow down plants. Once the flower opens, it’ll be a long time before everything has been pollinated and seeds fully develop. 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