Gardening should be something both easy to make and pleasing to the eye. Today you will find out how to make a beautiful Terra-Cotta Tower or `tree` of herbs. It’s very useful for every gardener to have them all in a convenient place, and also makes the space and design so much appealing. In order to achieve this project, you will need to have the following items:
• five planters (terra-cotta is recommended);
• a soilless potting mix;
• and a bunch of assorted herbs;
The secret behind this is using some if the pots in an upside down manner. Start by placing the large planter where you will want your tree to be; it’s hard to move it afterward. Turn a smaller pot upside down and center it in the large one. The distance between the two rings of the pots should be 6 inches. Pour soilless mix in this gap. Do the same with another couple of planters, this time a bit smaller than the first two. The space should be 4 inches. A final (fifth) small pot will go on top. Plant your herbs in the soil and marvel at what you have achieved in less than an hour’s work. Congratulations, you now have a great tower of herbs!
source: marthastewart.com
I have made this using only three pots in three sizes, and stacking them on top of the soil in each larger pot with 1 in buried into the soil. Functioned perfectly, and saved pots.