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A. Firstly, it’s good practice to water in the early morning, evening or at night to limit evaporation. Watering once a week to ten days is enough. An area of one square metre/sq. yard needs about 20 litres/4½ gallons of water every seven days. For an average hosepipe sprinkler that means about 12 minutes of sprinkling is sufficient for an area of 9 sq metres or about 95 to 100 sq feet. You can check how deeply the water is penetrating by digging a small test hole with a trowel after watering – a 10cm/4” depth of water penetration is enough.
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