Watering/irrigation

Watering/irrigation

When I was little I remember my grandfather always had a vegetable garden, and once when I was walking through it with him I noticed that he had several plastic jugs, like old vinegar and plastic quart sized milk jugs buried up to the neck every few feet apart in the garden. When I asked him why they were there, he said it was for irrigation or watering. Apparently they had holes in the bottom and he'd pour water in them to get water to the roots of the plants. It seemed like a good idea to me, but I don't know if he always did that, or if it was just something he was trying out that year. I can't ask him, because he's passed away since then. I don't think I've ever seen anyone else do that, though, so I was wondering if any of you have ever heard of this and ask whether you felt like it was a good idea or not. Where I live, we have had no shortage of rain so far, but we have been known to have dry summers on occasion. It might be a wasted effort if the plants get plenty of rain water, and for all I know, burying jugs in the ground might have the unwanted effect of lowering the temperature of the soil.
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