When is the time to prune snowball hydrangeas? In the northeast USA...

In the northeast USA...
Are my tomatoes in position to be picked...
I also live within Michigan and I LIGHTLY prune mine if at all contained by the late summer rash fall but at smallest 3 weeks before the first frost and I enjoy always have beautiful flowers!
Hope this help!

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According to Huntree Nursery in Michigan:

http://www.huntree.com/hydrangeacare

"They MUST NOT BE TRIMMED unless definitely necessary. Purchase a hydrangea to fit the spot. If you find that it get too big, move it or prune very insubstantially. Those sticks you have to bear up all winter are going to produce the flowers. If you remove these sticks, you remove the flowers. If you own a great need for a tidy look, don't plant Bigleaf Hydrangeas!"

And this site confirmed it along near giving pruning help for if pruning would be prerequisite:

http://www.hydrangeashydrangeas.com/prun...

*~ Good luck 'n happy gardening ~*
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Answers:    If you must prune do it right after they finish blooming. I do mine for the cuttings mainly and afterwards replant. I noe have a HUGE display and adjectives for free !