I use a product called Makins Air Dry clay a lot. Basically I push a lump of this into the planter and push the plants into it then cover with 'soil'
A while back I purchased a huge lot of it from eBay thinking it'd be cheaper that way.
Well...I just went to open a fresh box and it had dried out...and another box...and another. You get the picture.
Every flippin' block of it is a lump of rubbery useless....some bargain huh.
I don't blame the eBay seller at all...none of it had been tampered with and it is all still in the manufacturers packaging.
I've had boxes of this stored for years and it has been fine so I've no idea what happened this time.
I've emailed Makins to ask them...hopefully they'll reply.
So now I am stuck and can't finish my bonsai :-(