Our young Bhutan pine (Pinus wallichiana) has recently changings its needles colour to yellowish. what may be the reason? What is its hardiness? we planted it a few months ago in the garden facing the nothern winds. It may seldomly get as cold as -5 to -10 here in winter.. Shall we transfer it to southern garden where there is a protected site ? thanks..
- 13 Nov, 2009