when to prune birch
last year I planted 3 himalayan birch trees (Snowqueen) 6 feet apart with the idea of their knitting into a canopy which I could keep low. The trees are approx 7' at present & I want the finished height after 10 years to be about 18 - 20. The question is how & when shall I start this pruning process?
- 28 Jun, 2009