I really like roses.
There are over 100 species of roses
Oh really?  That is interesting.  What is the most common one?
I'm not sure but if you look a them the leaves alternate on the stem.
That is interesting.  How many different colors of roses are there?
A rainbow but reds and yellow are the most common
If you give someone a different color rose does it mean different things
Yes they have meaning but it is more cultural and not universal.