I had to LOL at this.... As WW said, no rocks in the bottom of your pots. Now I only laugh because I did this a few times myself and found out the painful way.. When It came time to transplant, the rocks would fall out of the rootball on bottom, and loosen some of the soil, and lets just say, A BIG MESS and a lot more shock to the plant! I suppose you could use rocks for the FINAL pot you are going to use, BUT, as I learned, these rocks have a certain pH. Being at the bottom of your medium, it wont matter as much, but the roots will bind there and feed around them, thus creating maybe a problem you dont need.