Sorry, hadn't seen this thread for a while so answering questions is a bit long winded.
Petra, the heated screwdriver, or anything heated really, is a good way of putting the holes into both foam boxes or plastic containers - but (there's always a
but) the holes produced are far to small for this method of plant growing. The holes have to be really large and it would just take to long "burning" the holes needed.
Vince, would be really warey of growing fruit trees using this method. As the roots are actually growing in raw fertiliser I believe it would be to castic an enviroment for most other trees. As I said in the original precis, the only trees I have tired the on are the Figs and a couple of Hibuscus. By all means try it, but only with one or two trees.
Hornet, the tile is there, as Bretts said, to train the roots into a flat pad, allowing really large trees to be planted straight into a Bonsai pot without having to cut into them to much. I am not sure if it is fact or not, but I seem to think roots grown horizontaly do not thicken as much as vertical roots in the same time span.
Bretts, you are a very naughty boy.......................
To all, I am sorry, if I remember I will come back tomorrow and fix all the grammar and spelling. An old mate, J. Walker has been visiting me tonight and he always leaves me a bit confussed.
