Hi Folks I have quite a large Box plant about 4ft high and 5ft wide it's taking over the border would it harm it if I cut it back by about a third, also if so when would the best time to do it.
According to the RHS, late May is a good time for attacking mature box plants that need to be cut back a lot. If you are feeling adventurous and don't care what the consequences are, you could cut it back now.....I've always been of the opinion that you can cut things back when you damned well feel like it but not all plants are in agreement. I guess it all depends how much this particular plant is hogging the border and whether or not you can wait another ten months.
For hard pruning its best done early spring that way it can put on enough growth through the rest if the growung season and it does not look ugly all year
Thanks folks I think I will leave until next spring.