How to Prune the Ninebark Diablo Shrub

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Ninebark is a genus of flowering deciduous shrubs known botanically as Physocarpus that belong to the Rose family of plants. "Diablo" and also "Diabolo" are trademarked and specially marketed named cultivars of Physocarpus opulifolius "Monlo." It is a desirable in the garden for its deep purple leaves that emerge in spring and persist through the fall. "Diablo" ninebark can tolerate and rebound from extensive pruning, when required or desired.

Things You'll Need

  • Secateurs
  • Loppers
  • Prune your "Diablo" ninebark shrub in the early to mid-spring after the last hard frost has passed but before new shoots are visible.

  • Remove any damaged, dead, diseased, cracked or abrading branches throughout the shrub with secateurs or loppers. Sever each individual branch in question down to the crown of the plant, leaving only live, healthy wood. Collect all of the cuttings from the shrub and soil surface, and discard them.

  • Reduce the length of outsize branch tips as needed to keep the desired, roughly symmetrical form of the shrub. Follow the natural form of the shrub, and place cuts 1/4-inch above a leaf node to encourage regrowth and branching.

  • Rejuvenate an older shrub by selectively removing up to 1/3 of the oldest branches distributed throughout the shrub. Take each branch down to the crown of the plant, being sure to collect and discard the cuttings.

References

  • Photo Credit George Doyle/Stockbyte/Getty Images
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