The famous giant sunflower (Helianthus annuus)! The yellow 'Giganteus' will be prominent in any flower garden. It grows one huge flower per stem. Birds can't get enough of the abundant seeds. Sow the flower seeds in late March to mid-April under glass, or outdoors in a seed bed from mid-April to May. Plant the seedlings outdoors after five or six weeks. The flowers bloom from July to October. The plant grows to about 250 cm tall.
Space the sunflower seeds 35 cm apart. Space the rows at a distance of 40 cm. Plant at a depth of 0.5 to 1 cm. The Helianthus grows best in full sun. After sowing, water the seeds adequately. The flower seeds come in a bag containing approximately 5 grams. This is enough to sow 6 square metres.