Just as Water travels upwards against gravity in a sponge, it will also do the same in soil. This is thesecret to the self watering containers. Plastic on top of the soil prevents weeds and nutrition leaching from the heavy rainfalls. This also prevents evaporation and conserves water. This also promotes deep root growth away from the harmful heat of the sun and decreases the stress on the plant allowing it ot out perform traditional garden plantings.
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