Unfortunately, I have read the review with respect by the previous speaker. Mold only after the purchase, otherwise I would have left it well. I have used for growing an indoor greenhouse and although I have the ground sprayed with a spray bottle and aired the contents of the greenhouse regularly, began after 4 days of the mold, to overgrow the pots. About a couple of other Aussaten with these pots I only put plastic wrap, can still be seen here thankfully no mold. But they also feel me quite dry on. However, the plastic wrap to prevent worse. My conclusion: The pots absolutely unsuitable for use in the propagator.