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> hung up near my bedroom window which is kept open
Sounds good, not sure what can be the problem. Maybe air is damp?
Maybe they should be placed to a sunny spot (with breeze). I dunno.
Our garden is awful for garlic. I figure the soil is too compact, clayey. I thought about mixing those parts where the garlic would go with some lighter textured soil, maybe with what one can buy for flowers, and with a little sand. I'm not even sure if acidic or basic soil would be better, I read it matters for quite a few plants.