Branching Pollenless Sunflower Growing and Harvest Information Plant Type: Annual Height: 1.2-1.8m (4-6') Sun: Full Sow: Can be direct sown into prepared beds after the last frost or indoors 2-3 weeks prior to transplanting Transplant: Harden off and transplant after last frost Days to Maturity: 50-60 days Plant Spacing: 30-45cm (12"-18")