Hard Pruning Tree Wisteria
I need some advice about hard pruning from the knowledgeable folks here.
I have a 20 year old Chinese tree wisteria which has become over-grown, so it needs some serious pruning. It's about 5 feet tall but it's more like 7 - 8 feet across. The trunk is about 5 - 6" in diameter.
I would like to top it down to about 4 feet & reduce the diameter to about 5 feet. In searching the web & this forum, most of the pruning information I've found is based on vines or minor pruning of tree wisterias. In the past, I've pruned this one annually but rarely more than 6 inches off the end of a branch.
How much can one cut off of a branch? What time of the year is best to do this kind of pruning? Normally I prune just after it's done blooming.
Best regards, Richard