I was concerned to find that the trays had no drain holes though there was an image to show they were meant for seedlings. There was very little in the way of information. Just a note to say that they may distort as they are porous. I then wondered if they were sufficiently porous to allow water to drain through and so I put some water in the bottom overnight and checked it in the morning. None had drained through. So I am left concerned that any seedlings would become waterlogged. I would need more information before recommending. Cant say more until we have tried one with seedlings in it.