Instructables
In short: this method uses the technology of some bird water bottles (like this). Additionally, you'll also use some communicating vessels

The basic idea is drawn in pic #1.

To make it, you'll need:

- plastic bottle with cap
- pot plate
- tubing (about 3 to 5 mm of internal diameter)

How to do it
1. Drill a hole (about 1 cm wide) at the bottom of the bottle (pic #2). The hole must be below the rim of the plate. 
2. Fill the bottle through the hole. Then put the bottle inside the plate (pic #3).
3. Fill the tube with water and use it to connect this plate to other plates (pic#4; more on this later).

How it works
A1. Water will fall off the bottle until its level (outside) reach the top of the hole.
A2. When the level of water (outside) goes down, some air will enter the bottle through the hole, and more water will fall off. 

B. The tubing will transform the two (or more) plates in communicating vessels. The water level will be the same in all plates (relative to the ground).

Notes
1. You can connect several plates to the main plate.
2. Make sure all the plates are in adequate level. You can easily level them with chopsticks or folded newspaper under any plate, for example.
3. The pot size and soil type may interfere in the success of this method. Also, be aware of watering needs of your plants.
4. Make sure there are no air bubbles inside the tubing. Due to the small diameter of the tubing, air will probably clog it.

Advantages
1. It is really self-regulating. (Some other methods depends on climate, watering needs and dripping rate.)
2. No need for electrical devices. No powering needs.

Drawbacks
1. It only works with pot plates or something like it (i.e. good for indoor use, but almost useless outdoor).
2. May not work with large pots (if soil capillarity is not sufficient to pull water from plate to the plant roots).


(P.S.: English is not my first language. Please, correct me if there is something wrong. Also... this is my first Instructable, so... please let me know if it lacks something.)
 
Remove these adsRemove these ads by Signing Up
cool good to know when here in corpus we somtimes have 6 month drouts
nv1z1 year ago
I like this method! One may use a single water reservoir to water multiple plants. If, however, you have plants in multiple locations, I found this one to be effective. It uses aquapicks [floral spikes] inserted into the cap of a plastic drink bottle:

http://www.kahnlandscaping.com/blog.html#watering

jarcher122 years ago
thanks this helped me find a solution to a problem i was having . Hopefully i can tweak this to make it work. ! cheers
dyuhas2 years ago
Use capillary matting instead. Your plants don't sit in water.
Drak292 years ago
Your watering system looks nice. In my opinion it should work great with hydroponics
BigShotUK2 years ago
Have you used this to grow anything yet?

It's a simple enough looking system, but I wonder how the plants cope with having such wet soil.

I try to water pots from the bottom like this, but never leave them standing in the water long term. I'd be concerned about the roots/soil becoming waterlogged.
gkaneto (author)  BigShotUK2 years ago
Hi! I'm testing it now (for 3 days) with two plants. Both of them like (but not require) constantly moist soil. But in my test, the most important difference seems to be the soil:

1) One of them is highly organic and have more clay; this soil seems to be a little over-watered, actually, but it's only 8 cm high. In this case, I think that good solutions would be a taller pot or a soil with higher porosity at the base.

2) The other soil is very "loose", mixed with coconut fibre; this is barely moist at the top (about 10 cm high). It seems to be perfect to these plant/soil/roots.

In the next days I will begin to test other combinations of pot height, soil type and root "deepness".

What do you think about all this?