how to cut back a treefern

Think it would be difficult to remove the crown - that's the growing tip. Could try digging them up and chopping off the bottom and replanting them - the trunk is actually the root. When we buy them they seem to have been chopped at the base. Plant them at least a foot deep (30 cm), or even deeper if they are subjected to lots of wind.

I nearly had heart failure Dominic until I saw where you are from. Even in their native area though they are slow growing and will not get much bigger quickly. But if you have to then I reckon Fourseasons advice is pretty sensible. In the UK of course you would simply sell them for large amounts of money and buy smaller ones. Lol.

John