The seeds are usually ready for harvest 30 to 45 days after the flower opens, but that depends a lot on the weather. You have to start with a variety of sunflower that can grow tall. These annual plants are tall, with a height of 8 to 15 feet. This is from mid-April to late May in the Northern United States. Always hoard a small number of the sunflower seeds that you’re setting out. Also calculate post-harvesting cost like storage, bagging, etc. To ensure pure seed, grow your sunflowers at least 1/2 mile from any sunflowers grown by your neighbors. 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. The Best Time to Plant Sunflower Seeds. If drilling, plant approximately 20 pounds per acre. Contact with the potential buyer of sunflower seed in your locality. Slow down plants. Cover the sunflower seed with dirt. Sunflower Farming Business Plan. Most sunflower varieties need 95-110 frost-free days to produce mature seeds, which means they can grow in zone 5 and warmer. 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. Sunflowers (Helianthus annuus) grow up to 8 feet tall with some cultivars reaching heights of 15 feet. Determining when sunflower seeds are ready for harvest can be tricky. Plant seeds and then use a cultipacker to put them at the appropriate depth. Plant the seeds no more than 1 inch deep and 6 inches apart. Sunflowers can be sown directly into the ground. Step 2 — Plant Sunflower Seeds. Don’t plant too thick, as too many plants will grow and competition will result in a lesser plot. Calculate the expenses of seed, fertilizer, nutrients, pesticides and labor costs. 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. Gently push the sunflower seed into the soil. This is the most important tip: genetics matter! The plant produces a large head of seeds that can be saved for planting the following season or … How to Plant Sunflowers: Place the sunflower seed in the ground. Once the flower opens, it’ll be a long time before everything has been pollinated and seeds fully develop. While saving sunflower seeds as a snack or as bird feed is common, you can also save the seed for replanting the next year. Sunflower leaves, stems and seeds release substances that inhibit the growth of certain plants. Sunflower seed heads make plants top-heavy and easily toppled with strong winds. First, fix the land area where you will grow a sunflower. Sunflowers seeds run approximately $25 per 10 pounds of seed. The sunflower (Helianthus annuus) grows well in U.S. Department of Agriculture plant hardiness zones 1 through 11. If broadcasting, plant about 25 pounds per acre. 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. Press down firmly. 1 Choose the Right Seed. Harvesting Sunflower Seeds. These toxins are harmless to people and eventually break down in soil. Planting sunflower seeds. This allows you to grow your favorite sunflower varieties each year without the expense of new seed stock every spring. 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. That’s why grass may die beneath your sunflower birdfeeder. Fix your sunflower farming budget. 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