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15-08-2018 #24
The water in the pipe is only to drain down and wet the soil at a depth to make a better contact, so it doesn't matter if the pipe cracks with frost (which is unlikely if open at the top). If your soil is very wet normally, then it is probably an overkill. Copper pipe is as good, maybe better than a plated steel rod.
Last edited by cropwell; 15-08-2018 at 10:31 AM.
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