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I have a couple of Japanese Black Pines (pinus thunbergii) which I've grown from seed. They are now about two feet tall with a trunk diameter of an inch and a half. I would like to stop them growing any taller and allow the trunks to increase in girth. I've been pinching off about two thirds of the candle lengths each year and selecting the two best buds to form the next years candles etc. but this means that the trees gradually get taller. How do I stop the trees upward growth without damaging them?

Just let them grow and cut back from time to time. Jbp are fantastic backbudders given the right care.

Pine-marten wrote: I have a couple of Japanese Black Pines (pinus thunbergii) which I've grown from seed. They are now about two feet tall with a trunk diameter of an inch and a half. I would like to stop them growing any taller and allow the trunks to increase in girth. I've been pinching off about two thirds of the candle lengths each year and selecting the two best buds to form the next years candles etc. but this means that the trees gradually get taller. How do I stop the trees upward growth without damaging them?

You normally would stop one of the lowest branches from growing out, keeping this one very small. the main trunk you let grow tall. This will create your trunk. Once you have a trunk that is suitable, you remove the leader, and you start building the tree from the lowest branch that you kept small, yet healthy.

To reduce the size of chops in the tree you can develop a sacrifice leader a number of times: Cut back and let ane side-branch grow out which is removed afterwards.

Key is to keep the lowest branch in place and to keep that one small so that you have fine branches low down on the trunk. Relying on back-budding to get low buds on a trunk is tricky, and as you cannot chop a pine down past the existing needles and expect it to live, it is increasingly difficult with grown out pines.