You can find resources for planting sunflowers below. Just click on an image to open up its pdf file.
Sunflowers like to be planted where they will be in full sunlight all day. Plant them 5cms deep in fertile soil that is well- drained. Then cover them in a thick mulch.
Water them once a day or more if the soil dries out. Your sunflower seeds will start to shoot in one to two weeks. If you have planted a giant sunflower then it can grow as high as 3 and half metres or 12 feet.