The cane should keep the sunflower firmly in place and prevent it from flopping but don't make the knot too tight or you could accidentally snap the stem. As the plant grows it will require more knots ...

To test this, researchers tied sunflower stems to prevent movement and even oriented some plants away from the sun. They found that sunflowers unable to follow the sun had reduced biomass and leaf ...

Plant sunflower seeds into a big pot with soil. Place the pot somewhere where it can get sunlight. Water the pot regularly until you can see the little stem, starting to poke through the soil.

Planting at the wrong time can cause the tubers to rot.

Plant sunflower seeds into a big pot with soil. Place the pot somewhere where it can get sunlight. Water the pot regularly until you can see the little stem starting to poke through the soil.