Yes and no. Last year, as an experiment, I grew mine through a length of roofing felt in which I'd made 35mm holes. That's the 'yes' bit, but they grew very tall and, when we tried a few for lunch, they were definitely woody and almost inedible, so that's the 'no'. I grew our onion sets the same way to begin with, but lifted the felt off once they were established. We had a great crop. Weed control fabric is woven so, unless you make holes that melt the surrounds, it'll almost certainly fray, hence my use of roofing felt.
Hi nick ,thanks for comment. I grow onions through fabric with great success, I burn holes with blow torch 👍. Curious to now how it works with leeks with them being deep in the ground. Wouldn’t roofing felt block air and water to plant ? .
cono1967 I genuinely don't know. I'm not a scientific gardener. I try things and await the outcome, but never know why. Someone locally suggested the felt could increase the soil temperature by a degree or two to give my sets a good start, because they certainly did grow quickly before I took the felt off. I attach two pics of the felt and last year's crop from just one €2 bag of sets.
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