I love blue moss cypress. The foliage is just beautiful...blue, soft, fragrant. Other positives - hardy and vigorous trees that can tolerate significant pruning/pinching and root work. The big negative has been stated by others - they are reluctant to bud back on older wood and are prone to dieback of the inner foliage if enough sunlight doesn't penetrate. So over time they tend to just continue to expand. So that leads to the question...how does one maintain these? Do you have to resort to grafting or do they just become bigger bonsai?
There were 4 beautiful specimens at the National Exhibition in 2014. The smallest was 16" tall, all the others were quite large (30+ inches, including one massive group planting). One of the trees can be seen on bonsaitonight:
http://dupuich.smugmug.com/Bonsai/Exhibits/2014-US-National-Bonsai-Exhibit/i-sM2fnH3/A
I have 3 - one a literati style, one a more formal upright style, and one in the growing bed. Trying to learn how best to manage the growth. Fortunately a friend in the local club is an expert with these, and he's been helping with the literati...but still a long way to go.
Here is a recent not so great pic of the upright one (I didn't have time to set up the lighting, so you can't see a lot of the trunk). It has become extremely dense so I used guy wires and selective trimming to open things up and separate the foliage. It will need considerably more thinning after the Exhibition. May start a thread about it at that time.
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