Sunflower single giant Seeds 20 Seeds - Grow up to 2m High. 
Single giants is one of the largest growing types.  The giant sunflower produces large yellow flower heads to 40cm across.  A heavy feeder preferring fertile soil in a full sun position.
 
Growing the Sunflower Plant
 
The facts are that a sunflower plant thrives in areas where it gets full sun exposure.  It needs to be exposed to direct sunlight for at least 6 to 8 hours a day. It prefers to grow on loose, loamy, well-drained soil as it has long tapped roots and secondary roots as well.  The plant flowers during the hot summer period and the soil needs to be slightly alkaline or basic.
 
How to Grow Sunflower Plant from Seed
 
It is ideal to plant the sunflower seeds after the frost in spring.
The best month to plant sunflower seeds in Australia is in early November, when the soil temperature reaches at least 15°C.
Sunflower seeds love to grow directly in the soil, as sunflower plants do not like being moved.
The plants must be planted with enough room between them.
Place seeds in soil that is about 1-2 cm in depth from the topsoil and spaced 45 cm apart.
In order to help the sunflower plant develop strong roots, you can add a light fertiliser to the soil when planting the seeds.
Seeds can be covered with netting until the seed germinates.  This will help in keeping the small birds such as sparrows away.
 
Caring for the Sunflower Plant
 
Water the plant around its root zone when it is small.
Once grown, water the plant deeply to encourage deep roots to develop.
Feeding the plant with fertiliser must be done in moderation.
Tall varieties might need some support when it grows.  Use bamboo stakes to support the stem of the plant.
 
Tip:
Shorter spacing between plants encourages longer stems with smaller heads.
Longer spacing gives space for bigger heads with shorter stems.