Repotting
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)
Structural bending and pruning
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".
Foliage Pruning
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/
Needle loss in Summer (Toya)
In summer, Juniperus may naturally shed its needles in some areas. This is called "Toya" in Japan: the needles turn yellow and fall off. This is a natural process, compare it to pigeons molting their flight feathers, which are shed and then grow new ones.
Grafting
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
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