You might want to know what a concept is, I am not surprised if you do.
Maths is a concept and Algebra which is part of maths is also a concept. A bicycle can be a concept as well as something you might ride. If you want to think about bicycles, maybe to design a better one, you will think about the concept of a bicycle. What is a bicycle for and why do people want to ride one etc.
A concept is an idea, any idea concerning something which you might want to build, or think about. So the universe is a concept as well as a thing and a place where you live.
Concepts are often things which you might think about and that is why they are defined as ideas. So a concept map for instance, is a graphical representation of something which you might think about; yes even that.
What might the concept of a Bluebell be?