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.
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.