riverman - I just pruned my 'Limelight' a couple of weeks ago. It's a standard form - one trunk. Since they bloom on new wood, you can prune them in winter or spring. I wouldn't prune in fall because of pruning encouraging new growth that might not harden off in time for winter. Some of the plant energy would go into growing new stuff instead of reserving for winter. Without seeing a photo, it's hard to tell how far you can safely prune.
