Thanks for the comment.

It’s nice if a seed tray is deep, maybe about 5-7cm. Otherwise the dirt can easily spill out.

The bottom of the seed tray should not be flat, otherwise water will get trapped under it.

It’s usually easier to have several smaller ones, rather than only one or two big ones. The one I have (15×20cm) is a good size. A tray a little bigger or smaller would also be fine.

It should be made from a strong material. Sometimes seed trays get dropped or stepped on.

I hope this helps! If you have any questions, please let me know.

It is indeed a great seed tray. I live in the Netherlands, and bought it at a local shop. I don’t even know if they still sell it.

The get a lot of their stuff from the UK, and this tray has a sticker on the bottom that says “Made in England” but otherwise no identifying marks.

I don’t know if any of this helps…

If you come up with a a good idea for recycling something for use in making your own seed tray, I hope you will report back here or post about it.

I’ve tried various things myself, but came to the conclusion nothing worked as well as a purchased one. One of the features most commercial ones have is a ridged bottom, so water won’t collect under it. When you combine this with size, shape, proper drainage holes, edge height and so on, it’s hard to find something else that works as well.

For me, my seed tray is like a good garden tool, to be reused for years. My old trays just wore out after about 8 years of reuse, and I just bought a few of the ones pictured which I expect will last for 10 or more years.