How to Build a Vertical Garden from Soda Bottles
Here is a way to maximize your limited porch or garden space by growing vertically. You'll learn to make drip-irrigating garden towers out of recycled 2-liter soda bottles. This method works well for growing flowers, herbs, and small veggies.
1. **Cut around the base of one soda bottle.** Make the cut a bit below where the label ends, ideally so that a tiny bit of the bottom curve inward is preserved. This will help the bottles nest tightly together when you stack them. Discard base of bottle
2. **Poke two drainage holes with scissors, on opposite sides, about three inches above the cap.** How big? No bigger than the diameter of a Bic pen.
3. **Fill the bottle with potting mix, compost or garden soil, pressing the soil in lightly.** Leave an inch of space at the top of the bottle.
4. **Tie the base for your tower onto a supporting structure, such as chain-link fencing or wire, with twine.** 
5. **Cut the bottom off a bottle, just as you did to create the base.** Remove the cap and discard.
6. **Fill the bottle gently with soil, as for the base, reserving one inch of space at the top.** 
7. **Nest the bottle firmly atop the base, and tie it on.** 
8. **Repeat this part 1-3 times, depending on how tall you want your tower to be.** 
9. **Cut a bottle in half about midway toward the top.** This bottle will be shorter than the others, and will serve as a funnel for watering.
10. **Cut the bottom off a final bottle, just as you did for the base and tower levels.** This will be the watering bottle.
11. **Drill a one mm hole in the cap, or pierce with a nail, and replace cap.** 
12. **Place the funnel atop the tower, nesting it firmly in the soil of the level below.** 
13. **Place the watering bottle atop the funnel, and (optionally) tie down.** 
14. **Cut three lines in each soil bottle with a box cutter, as if you were drawing the top and sides of a square.** (Each side of the square should be about 1.5-2 inches.) Leave the bottom of the square uncut, and instead fold down the flap. This creates a valve to hold the soil and seedling in.
15. **Poke a hole, and insert a small seedling or seeds.** 
16. **Fill the watering bottle every few days, as needed.** 
17. **Finished.** 
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