Hi,

I'm very new to growing plants from seeds and I've started with growing red sunflowers from seeds. All was going well during the first few weeks now I'm not very sure what to do as they've grown so tall about 2 and a half feet.
The stem is also very thin still, not sure if thats how it should be.

Can someone please advise me if they are going to grow more tall and when should I expect them to flower. Will the stem gain more body and how often do I need to feed the plant food.

Any response is really appreciated and thanks in advance.