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Certainly in the grow bags if the soil feels moist the water does not drain out of the bottle. The best bottles are the 500ml small rimmed, long neck bottles. It seems to work fine.
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I haven't tried that, I would have thought that the water would fall out of the bottle too easily.
i never tried it but i saw on tv a glass blown bottle
that u put water into and when the plant soil is dry
it gives off oxygen in this bottle and it dispenses water. its good for up to 2 weeks so u dont have to
water the plants.