So we made it understandable for kids like me. If you are a gardner, you will use the giant sunflowers to make a background. It grows anywhere from 8 to 12 feet high really fast. If you have a small garden, try the dwarf ones that only grow 2' in height. When growing sunflowers for bird seed or snacking, choose the confectionery types over the oil types.
Sunflowers do best in soil with lots of water holding capacity, drainage and fertilzer.
Sunflower roots grow deep and spread a lot, so they can stand a dryspell every now and then. You should not over water a sunflower 20 days before and 20 days after flowering. This might deform the flower heads. If you really want your sunflower to do well, do soil tests. Too high nitrogen is not good, and make sure you have potassium and phosphorus in the soil.