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Sunflower Giant King Kong has very strong, thick stems. A majestic plant growing to 5m, feed and water generously to maximise the height. Sunflower Giant King Kong is the tallest of them all up to 5m with a very large main flower up to 40cm across Sow Spring to early Summer, 10mm deep and about 50cm apart, direct where they are to flower. Keep well watered and mulched in hot and dry weather. Choose a site that is protected from wind and receives lots of sunlight. Staking recommended at early stage of growth. When To PlantNorth Island: Jan, Feb, Sep, Oct, Nov, Dec South Island: Jan, Feb, Sep, Oct, Nov, Dec