No. Unfortunately, the things that a sunflower needs like water, atmosphere, and nutrients don't exist in space. So, unless you were growing it inside a spaceship with special sunlamps and other necessary things, it wouldn't work.
A sunflower typically requires about 1 to 2 square feet of space to grow effectively.
Sunflower seedlings should be planted about 12 to 18 inches apart to allow enough space for them to grow and thrive.
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
Yes, you can replant sunflower seeds to grow new sunflowers.
If you put a cut stem in the soil, it is unlikely the sunflower would grow. It would need to grow from seed.
In cluster
No, you cannot plant a cut sunflower and expect it to grow because it needs to be planted with its roots intact in order to survive and grow.