Flowers are better then vegetables?

> Are flowers better than vegetables?
Note: Form correct interrogative sentences.

Do you know ?­??? It is Korea's traditional food.
> Correct!

It looks like rice cake decorated with flowers.
> It looks like a rice cake decorated with flowers.
Note: Do not forget your articles (a,an,the).

We make it with some special flowers.
> Correct!

Those flowers were really delicious and healthy.
> Those flowers are really delicious and healthy.
Note: A simple present tense is used to talk about facts. It is also used to make generalizations about people or things.

There were azaleas for ezample.
> There are azaleas for example.
Note: Be careful with your spelling.

Azaleas were really pretty and sweet. Every one liked azaleas.

> Azaleas are really pretty and sweet. Every one likes azaleas.
Note: We use a singular verb for pronouns like everyone, everybody, someone, no one, etc.

However, royal azalea was really dangerous then azalea.
> However, royal azalea is really dangerous compared to azalea.

It was poisoned.
> It is poisonous.

 When you eat it you could be dead, too.
> Also, you can die if you eat it.
Note: I reconstructed your sentence to make it clearer.

So some people died because they thought that royal azalea was azalea and eat it.

> So some people died because they thought that royal azalea was azalea and ate it.  
Note: Be mindful of your verb tense.

So that is why I think flowers are nice and healthy, but they are not nice then vegetables.
> So that is why I think flowers are nice and healthy food, but they are not better than vegetables.

Vegetables are less poisoned.
> Vegetables are less poisonous.

So we can eat a lot of vegetables.
> Correct!

No one knows the new flowers that grows up can be poisoned.
> Some people do not know that some flowers can be poisonous.
Note: I reconstructed your sentence to make it clearer.

So I think all of us should know what we are eating are dangerous or poisoned. Expecailly for children.
> So I think all of us should know if what we are eating are dangerous or poisonous, especially for children.