Iris Cohen schreef
Take a deep breath and try again.

The Shimpaku is the way I want it as far as style is concerned. But
junipers are slow growing. If I could keep it dormant for six weeks or two
months, and then grow it under lights for the rest of the winter, its
development would be much faster. Although the basic shape is OK, it is
still a baby. If someone with 40 years experience tells me I can't give this
treatment to a Shimpaku, I will follow his advice. I just want to know why.
And I would like to know if there are other junipers which will also thrive
on the shorter dormant period and 3-4 months under lights.

+ + +
Ah well, two interesting items:
- you might ask your 40-year man if you can do with J.squamata what he
advises against doing with your 'Shimpaku'. If he gives the same advice for
both, you can use the same strategy for both. After all the natural ranges
for J. chinensis and J. squamata are more or less comparable.
- if the 'Shimpaku' is still a baby it should be less valuable and thus a
suitable project for experimentation?
PvR

PS: blasting your Junipers is unlikely to be the answer!