Join Date: Apr-2004
Location: Clinton Township, MI
Country: USA
Posts: 4,227
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In my experiance I have found that mugo's respond well to top pruning and not well to root pruning. I never remove more than 1/3 of the roots at a time.
I know that you are from russia but I am not sure of your growing zone, so I can not offer you advice on what time of year to do this work.
Persoanlly, I would repot, cleaning up the roots a little while combing them out gradually. I would then remove the unwanted branches at the whrols that are creating bulges, cut back the apex a little and then leave it alone until next spring.
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