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Not always. If you're watering circular, small or medium-sized pots, a bottle will do. If your pots are large and rectangle or square, basically having a large exposed area, you might want to consider the number of bottles according to distance and the amount of water all the plants need together. If you have garden plants with bases close to each other, you might want to install a bottle for every three square feet, adjusting the amount of water depending on the climate and the plants.
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