[shaun]

the thing with tyres is you dont know what dodo is in them and they would be a * to empty out when you crop em.plus who wants tyres stacked up in there back garden

[agapanthus]

and another good one would be plastic manhole raising ring.the ones i'm thinking about are plastic about300mm high and 250mm across(they come in bigger and smaller sizes though)and are black.
so you plant it in one ring and as you earth the plant up you add another ring.
polypipe make them.

or tyres

Damn I was just gonna say that WG !!!!    

[WG.]

plus who wants tyres stacked up in there back garden

Not me that's for sure.  I'm happy with my tree bags.

[mkhenry]

I tried planting in tyres but the bloke next door moved his car :shock: