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This is a photo of a tree in spring of 2019 notice how leggy the branches are. I bought the tree in fall of 2020 and have decandled it for the past few years. Here is the same tree this month
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It is young in its bonsai journey and has a long way to go but notice the improvement in ramification and needle density in a few short years. It will fill in more with additional decandling and back budding. Also notice the bud size in the first picture and the size of the buds now. Notice the relatively consistent needle length. This is energy balance and refinement.
As for breaking candles in spring, it’s generally not necessary and arguably counterproductive. As you mentioned, spring is the time to build energy so it is best to let the candles elongate for hormonal cross talk to occur. Once you break the candle in spring you are decapitating the auxin in the buds and slowing root growth as the auxins are no longer traveling into the roots. I am of the opinion to let the candles elongate and strengthen the roots as you will be cutting them in mid summer anyways during decandling time.