I didn't make mine quite the same as hers. I did not want to use terra cotta pots (they soak up too much water from the soil), and the pot turned upside down inside another pot did not work very well for the plastic pots I found (at Wal-Mart). So, some tweaks I made were :
1. Used plastic pots instead of terra cotta.
2. Used more soil (about 1 and a half bags).
3. Added a PVC pipe with small holes drilled in it as a way to add stability to the pots, along with a way to water the herbs without dumping water on top of them. This idea came from my younger brother. He had done something similar with a large wine barrel used as a strawberry planter.
So here we go!
2 - 6" pots
2 - 10" pots
2 - 15" pots
2 - 22" lengths of 1" PVC pipe
2 bags of soil (I used Miracle Grow, 16 quart bag)
Power drill with 1 1/4" drill bit and 1/4"
A partner in crime! (I used my little brother)
Seeds! (I used sage, thyme, parsley, oregano, chives, and basil)
1. Using the 1 1/4" drill bit, drill holes in the bottom center of your 10" and 6" pots.
2. Cut your PVC pipe to the length you would like (I used 22" so it stuck out of the top somewhat).
3. On your PVC pipe, marks dots every 3 inches.
4. Using the 1/4" drill bit, drill small holes at these dots for water flow. I alternated where the holes were drilled by turned the pipe 90° each time I went to drill a hole.
5. Gather everything and put it together!
7. Take your 10" pot and slide it over the PVC pipe so that the pipe is sticking up through the middle of it, and place it on top of the soil in the 15" pot.
9. Fill the 6" pot with soil.
10. Plant your seeds! I made 2 towers with sage (in the top pot), thyme (middle pot), parsley (bottom pot) of one tower and oregano (top pot), chives (middle pot), basil (bottom pot) of the second tower.
As of today, July 8th, I have herbs popping up in each of my planters! I can't wait until they are fully grown and smelling delicious!