I've decided to add a new element to my gardening arsenal, self-watering containers. I think they would more accurately be called "automatic-wicking reservoir systems" but that's just me. Anyway, here is my potato bucket and my first successful prototype. The basic concept is to create a reservoir for water in the bottom; create a way for the water to wick into the soil; and include a mechanism for filling the reservoir.
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the final product |
Materials:
- two large plastic planters (~ $15 each at Lowe's)
- fat pvc pipe (~ 4" dia.)
- skinny pvc pipe (~ 2" dia.)
- Power Tools (Optional): drill, compound mitre saw, skill saw
In this case, I've created a 2 gallon reservoir by measuring the water level at 2 g. and cutting the fat pipe so that the top container rests at the correct height. The pipe acts as both a support for the top container and as the holder for the soil wick. I've drilled several 1/4" holes around the pipe in order to let water freely into the wick. Having a 2-gallon capacity will allow me a little more freedom with watering. I should have enough water to tide me over for a day or two during the really hot days of summer. Obviously, the bigger the reservoir, the less often I will need to water. *Note: most large vegetables will use a gallon of water each day at their peak.

Next, I prepared the top container. The soil wick needs to touch the soil in the container, so I've cut out a large access hole in the center. Also, I've drilled several 1/4" holes to allow for air circulation from the bottom. It's not shown, but I also cut a hole for the "snorkel", or small watering pipe.
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bottom view of the top container |
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soil wick before the top
container is put in place. |
Before I can add the top container, I need to put a bit of soil in the wick.
The last step is to add the top container and I'm ready to plant! I'm using this container for potatoes so it's a little different than just filling it to the top and planting. I put a base of about 3-4" of good container soil and placed my 6 beautiful seed potatoes on top. I put just another few inches of soil on top and watered. As the potato plants grow up, I will add more soil ("hilling" the potatoes) until the box is full.
Can't wait to taste these yummy tubers :)!!