Ninebark Shrubs
Q.

Ninebark shub

Zone monument, co zone 3 | jgetchey added on July 16, 2017 | Answered

I have 2 winecup ninebark bushes that I am unable to find pruning advice nor mature size info.

A.
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MichiganDot
Answered on July 16, 2017

I can't find any reference to "winecup ninebark" so something in your name is amiss, I fear. Post a picture on any of the web plant ID sites and get a firm ID. We'll go from there. If it is ninebark, Physocarpus, treat it like many flowering shrubs. It blooms in the spring; prune right after bloom is over - definitely before July 4. Pruning after that will be removing next year's blooms. Remove 1/3 of the oldest stems every year to contain the overall size and keep young, more heavily blooming stems. Ninebark is prone to powdery mildew in hot, dry weather so I like to make sure there is good air circulation, especially at the bottom where the arching stems reach the ground.

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