Plant can take 75 to 90 days to mature. If you want a fast growing plant that will mature in a short time then plant radishes. Some radish varieties can be ready to harvest in 22 or 23 days.
sunflower
they get 500 tons of water
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.
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.
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.