The best time to repot Junipers is March/April, up to very early May.
Juniperus Rigida (Tosha) can be repotted later, early to end of May, for they tend to wake up slightly later.
Source: Peter Warren (saruyama.co.uk)
Best time for major branch removal / trimming is spring, just as the tree is coming out of dormancy.
Best time for major wiring / bending (trunk and primary branches) is also spring, or in early fall just as temps cool.
Avoid this type of work in June, July, and August, the bark might separate from the cambium layer and your Shinpaku tree could die as a result. Light pruning is fine, but hard bending is a "no-no".
Best time for foliage removal is during the growing season, sparingly to maintain a clean look on finished trees.
Source: Brian Van Fleet - https://www.bonsainut.com/threads/juniper-bonsai-styling-timing.36703/
Scion grafts on junipers are pretty easy to do. We do these about April/May.
Source: https://www.bonsainut.com/threads/juniper-foliage-reduction.71979/post-1239595
Develop Sekka Hinoki in low unglazed pots (e.g. Japanese terracotta pots)
Try to overwinter the Sekka Hinoki in a frost free place. The trees that have overwintered free of frost will grow out faster and ealier than the ones that have been in frosty conditions.
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