Many people don't know my true form
You may see me within a sandstorm
My green is ancient
Before you use me, be patient
And a famous entity is warm
Hint
Lines 3 and 4 refer to paper, but the answer isn't a tree
Name the plant
Many people don't know my true form
You may see me within a sandstorm
My green is ancient
Before you use me, be patient
And a famous entity is warm
Hint
Lines 3 and 4 refer to paper, but the answer isn't a tree
Name the plant
Perhaps you are:
The papyrus plant.
Many people don't know my true form
This is a plant that many people aren't very familiar with.
You may see me within a sandstorm
Papyrus was famously used by ancient Egyptians, Egypt being almost synonymous with a land of desert.
My green is ancient
This green plant was used by ancient Egyptians for many things -- including for paper. Also, during the construction of papyrus paper, the color is transformed from green to a shade of brown.
Before you use me, be patient
In the construction of papyrus paper, you need to hang it up to dry before you can use it. Thus, you must be patient.
And a famous entity is warm
This one I am not sure. If warmth is in reference to the sun - the plant must grow in full sun, and parts of the plant may have been used ceremonially in worship of Ra (the sun God).
I think the answer is
tumbleweed
Many people don't know my true form
The tumbleweed we know in cowboy movies is not the living form of the plant.
You may see me within a sandstorm
You sometimes observe a tumbleweed rolling in sandstorm or desert (like in cowboy movies)
My green is ancient
When you observe the usually known form of tumbleweed, it is not green anymore but is used to be.
Before you use me, be patient
You have to wait before your tumbleweed plant gives you is "moving form"
And a famous entity is warm
I guess it is the burning bush but it wasn't really a tumbleweed. It was more like a bramble
Name the plant
tumbleweed again
This might be:
Plant of Immortality (Aloe Vera) The Amazing Properties of Aloe Vera like healing wounds, keeping healthy, beautiful and around 50 more makes this plant very useful. But the people are not aware of the benefits of the Aloe Vera. Though, people in ancient time used this widely for the different purpose.