Roses are red...

I'd like to share a little poem that I found on the 'net:

Roses are red
Violets are blue
That's what they say
But it just isn't true

Roses are red
And apples are, too
But violets are violet
Violets aren't blue

An orange is orange
But Greenland's not green
A pinky's not pink
So what does it mean?

To call something blue when it's not
We defile it
But, ah, what the heck
It's hard to rhyme violet.