A sunflower can grow about 4.5 in. in two weeks.
1. is a sunflower hard to grow
it takes about 80 to 120 days (all summer) for a sunflower to grow.
they usually grow any were you want them to grow
They grow
sunflower
the roots of the sunflower grow rapidly so this can cause it to store rain to grow even tho being chopped in half
In cluster
If you put a cut stem in the soil, it is unlikely the sunflower would grow. It would need to grow from seed.
You need to be growing the proper species. Not all of them will grow that tall. Look for "Giant" sunflower seeds.
it grows with light and water
The southern states.