Well, a true breed is a type of plant that if you made it with itself it will produce that same trait over and over, generation after generation. So to see an example, let's consider the following case. Let's suppose we have a male individual who is true breed for the color blue. So their eyes are blue and they're true breed for that color. And we take a female who is also true breed for that blue eye color. Now, if they mate, they will produce an offspring who also has the color blue.