What kind of greens grow tall and have small yellow flowers?

It's hard to give you a definitive answer without more information! There are quite a few greens that grow tall and have small yellow flowers. To help narrow it down, can you tell me:

* Where do these greens grow? (Garden, field, forest, etc.)

* What is their size and shape? (Are they bushy, leafy, or something else?)

* When do they flower? (Spring, summer, fall?)

* Do you have any other distinguishing features? (Smell, texture, etc.)

Knowing more about the greens will help me give you a more specific answer.

For example, some possibilities are:

* Common tansy: A tall, bushy herb with small yellow button-like flowers.

* Black-eyed Susan: A wildflower with tall stems and daisy-like yellow flowers.

* Goldenrod: A tall, slender plant with small yellow flowers that bloom in the fall.

Let me know more details and I'll see if I can give you a more specific answer!