Moss growing between travertine tiles on patio, what to do?

Q: I have moss growing in the cracks between some travertine tiles, how do I keep the moss out? No problem with travertine that received direct sunlight. I live in FloriDuh .....Heeeelp!

A: The best option would be to use a natural stone cleaner mixed in
with water to clean your travertine. You can check at your local
hardware store which one is more suitable for your project. For
deeper cleaning there are the following options: either use boiling
water, or another trickier option is to use a water and white
vinegar mix. 
For the latter you will need to do a spot test since travertine
reacts to acidic liquids. If it doesn't etch the travertine you
should use it in between the joints of the tiles. Lastly, make
sure you have proper drainage in order to prevent moss from coming
back too often.