McGregor's Russian Giant Sunflower Flower Seed SKU: 135299 MODEL: M2860 Error. try again later You've successfully joined the club $ 3 .18 each Available on orders $50 to $1500.More info × Mitre 10 MSAvailable at Mitre 10 MEGA and selected Mitre 10 stores. Variants The classic 'Giant' sunflower has huge golden yellow flowers. Give it plenty of space, food and moisture to get the maximum size. Features and benefits Flowers in approx 90 days.