Posted: 13/10/2014 at 17:11
There are some very good birch cultivars that are very narrow-growing, and birches tend to have shallow roots. I reckon that in this situation you should regard any tree as temporary. When it's ten years old cut it down, dig it out and start again with a new one. Works out at about £4 per year, which is far cheaper than Cabernet Sauvignon and you don't get the hangover either.