Questions on Japanese maple tree

I'm new to the hobby and I'm planning on working with Japanese maple trees and had a few questions.

It's my understanding that the Japanese maple is not to be pruned in the spring like other typical deciduous trees.  What is considered the best time of year to prune them?  I'm in the Northeast in New York state.  

Is this pruning in the later part of the year for just the Japanese maple tree or all maple trees?

Is it OK to repot and root prune in the spring?

THANKS!

Welcome to the IBC! I prune, root prune and repot my Japanese maples in early Spring.
I believe I have read somewhere that some suggest pruning in Winter so the tree doesn't 'waste energy' developing new buds only to have them cut off.
One of the best bonsai resources in the US is in Rochester! Check it out.
http://www.internationalbonsai.com

John Quinn wrote:Welcome to the IBC! I prune, root prune and repot my Japanese maples in early Spring.
I believe I have read somewhere that some suggest pruning in Winter so the tree doesn't 'waste energy' developing new buds only to have them cut off.
One of the best bonsai resources in the US is in Rochester! Check it out.
http://www.internationalbonsai.com

COOL!!! Thanks for that link John.

When you prune a J. Maple in Spring, or just after leaf fall in autumn, when the sap ciculation is still active, the cuts will often "bleed". This doesn't put the life of the tree at risk.

When you prune both the branches and the roots, it doesn't bleed.

You can also prune it in early-mid-summer, though it is less practical unless you defoliate it at least partially. When done at this time of the year, it heals faster.

Thanks AlainK!