Identification wanted

[DannyRam]

I am in course of tidying the greenhouse up and found the attached.
Can anyone help with this.

These just appear to be little stones. Just googled and they appear to be baking stones!!

This is more complex. You can work it down to dust in your fingers.
Any help would be appreciated. I would hate to throw something away that could be useful!!

[veggiechicken]

The round stones look like the clay pebbles that are used in hydroponics to hold water 10L Clay Pebbles for Hydroponics > 3CH London
Don't know about the dust though!!

[RaptorUK]

The "dust" looks like horticultural grit to me . . . can you break it all down to dust or just some of it ?

[Highlander]

Can you be more specific about where in the greenhouse you found your mystery stuff. Is it in bags or part of the floor?

[Bill HH]

The first one is definately a pound coin.

[DannyRam]

These are definitely stones VC.

[DannyRam]

Can you be more specific about where in the greenhouse you found your mystery stuff. Is it in bags or part of the floor?

The stones were in a tin. The dusty stuff was in a rotting plastic bag.

[DannyRam]

The "dust" looks like horticultural grit to me . . . can you break it all down to dust or just some of it ?

It does break down to dust and I thought it might be growmore or some such stuff

[Aberdeenplotter]

The stones were in a tin. The dusty stuff was in a rotting plastic bag.

bin it. Could be manky bone meal or worse

[Highlander]

I don't think growmore would look like that. When I have seen old / damp growmore it has been more like wet powder and not like the picture.

[mothhawk]

The stones were in a tin. The dusty stuff was in a rotting plastic bag.

What size plastic bag? 25 kg or 1kg sort of size? I would put a spoonful into a mug of water and see if it dissolves. If it does, then it's probably fertiliser of some sort (but may be herbicide - do a trial test on a little patch of grass or a few seedlings in a pot). If it doesn't dissolve, my first guess would be bonemeal, or blood/fish/bonemeal. Does it have any smell?

[andy_j]

The stones are something called "Leca" and are used in hydroponics or sometimes for "prettying" up pot plants as a mulch.

The other stuff looks like John Innes base or any of the other fertilizers mentioned which appears to have got a bit damp at some point.