A cheap way to install automatic watering is to make your own discreet watering device out of an old plastic drinks bottle.
1) Cut out a hole in the base of the bottle, just large enough to be able to water through.
2) Loosen the cap of the bottle then place it upside down in the pot so the base of the bottle slightly pokes just above the surface of the compost.
3) Fill the bottle with water through the hole in the base and it will slowly seep out of the loosened cap, providing your thirsty plants with just the correct amount of water that they need.
An alternative is to cut an old plastic drinks bottle in half. Make three or four small holes in the base, then stick it in a grow-bag of, for example, tomatoes (being very thirsty plants). Fill the half-bottle with water and it will slowly trickle through the holes to ensure the tomatoes never dry out.
It is also possible to buy specially made spikes which fit on the top of a two-litre plastic drinks bottle. Once the bottle is inverted you can stick the spikes into the ground and their ingenious little boles release water or liquid nutrients slowly. As the spike penetrates so far into the ground the water or feed will be at the right level to reach the roots.
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