A new and distinct selection of Ninebark, Physocarpus opulifolius, which shall be referred to hereinafter as cultivar `Monlo`. Cultivar `Monlo` differs distinctively from other Physocarpus opulifolius plants by possessing a unique combination of an outstanding cold hardy shrub with intense foliage color throughout the seasons peaking in summer to a maroon red and contrasting to the creamy-white flowers.