Problems with container gardening include not enough root space and the difficulty of effective watering.  Top watering is slow and it is hard to get enough water into the container to satisfy the plant's needs.  The double bucket approach to container gardening provides more soil for roots than many containers provide and there is enough water available so that even tomatoes usually don't dry out during the day.   The PVC pipe delivers the water to the bottom of the container where the roots can more easily get at it.   

Step 1: What You Will Need

Materials:     2- 5 gallon, nesting plastic buckets
                       2' x 1-1/2" PVC pipe  (diameter is up to you but a larger diameter is easier to fill)
                       1- 3/4" x 6 screw ( I use hex head)
                       1- yogurt cup (8 oz.)

Tools:            drill
                        hole saw (for yogurt cup)
                        hole saw (for PVC pipe)

<p>Nice plan! I'm not quite clear on the function of the yogurt cup? I like using the kitty-litter buckets for our plantings, because they are square-edged and fit tightly together. Space is at a premium on our small fire-escape landing. </p>
<p>The yogurt cup, with holes and soil in it, extends into the water of the lower bucket. It acts as a wick ti draw water up to the root zone.</p>
did u put holes n the sides of the yogurt cup and if so how many?
Due to the height of the yogurt cup, I cut off the entire bottom using a hacksaw. You could just put three or four 1/4&quot; holes in the bottom using a knife.
You might try entering this in the Water Challenge. <br>https://www.instructables.com/id/Summer-Water-Challenge/

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