Physocarpus plant named ‘SMNPMS’

#Botanical designation: Physocarpus opulifolius.

#Cultivar denomination: ‘SMNPMS’.

#The present invention relates to a new and distinct Physocarpus plant, botanically known as Physocarpus opulifolius and hereinafter referred to by the name ‘SMNPMS’.

#The accompanying colored photographs illustrate the overall appearance of the new Physocarpus showing the colors as true as it is reasonably possible to obtain in colored reproductions of this type. Colors in the photographs may differ slightly from the color values cited in the detailed botanical description which accurately describe the colors of the new Physocarpus.

#The photograph on the first sheet is a side perspective view of a typical plant of ‘SMNPMS’ grown in an outdoor nursery.

#The photograph on the second sheet is a side perspective view of a typical plant of ‘SMNPMS’ grown in a container.

#The aforementioned photographs and following observations, measurements and values describe plants grown during the spring and summer in ground beds in an outdoor nursery and in three-gallon containers in a polyethylene-covered greenhouse in Grand Haven, Mich. and under cultural practices typical of commercial Physocarpus production. During the production of the plants, day temperatures ranged from 18° C. to 25° C. and night temperatures ranged from ranged from 5° C. to 10° C. Plants were two years old when the photographs and the description were taken. In the description, color references are made to The Royal Horticultural Society Colour Chart, 2015 Edition, except where general terms of ordinary dictionary significance are used. Botanical classification: Physocarpus opulifolius ‘SMNPMS’. Parentage: Female, or seed, parent.—Physocarpus opulifolius ‘Seward’, disclosed in U.S. Plant Pat. No. 14,821. Male, or pollen, parent.—Unknown selection of Physocarpus opulifolius, not patented. Propagation: Type.—By softwood stem cuttings. Time to initiate roots, summer.—About 25 days at temperatures about 24° C. Time to produce a rooted young plant, summer.—About two months at temperatures about 24° C. Root description.—Medium in thickness; fibrous and fleshy; typically white and brown in color, actual color of the roots is dependent on substrate composition, water quality, fertilizer, substrate temperature and physiological age of roots. Rooting habit.—Freely branching; medium density to dense. Plant description: Plant and growth habit.—Perennial shrub; relatively compact, upright and uniform plant habit; vigorous growth habit. Branching habit.—Freely branching habit with about 15 lateral branches developing per plant; pinching enhances lateral branch development. Plant height.—About 48 cm. Plant diameter (area of spread).—About 65 cm. Lateral branch description: Length.—About 30 cm to 60 cm. Diameter.—About 4 mm. Internode length.—About 2 cm. Texture.—Smooth, glabrous. Aspect.—Erect to outwardly. Color.—Close to 59B. Leaf description: Arrangement.—Alternate, simple. Length.—About 5 cm. Width.—About 4 cm. Shape.—Roughly rhomboid, tri-lobed. Apex.—Acute. Base.—Cordate. Margin.—Doubly serrate. Texture, upper and lower surfaces.—Rugose, glabrous. Venation pattern.—Palmate. Color.—Developing leaves, upper surface: Close to N92A. Developing leaves, lower surface: Close to 188A. Fully expanded leaves, upper surface: Close to N186A; venation, close to 156A. Fully expanded leaves, lower surface: Close to 191A; venation, close to 156A. Petioles.—Length: About 1.7 cm. Diameter: About 2 mm. Texture, upper and lower surfaces: Smooth, glabrous. Color, upper surface: Close to 183B. Color, lower surface: Close to 182B. Flower description: Flower initiation and development has not been observed on plants of the new Physocarpus to date. Garden performance: Plants of the new Physocarpus have been observed to have good garden performance and to tolerate rain, wind and temperatures ranging from about −32° C. to about 36° C. Pathogen & pest resistance: Plants of the new Physocarpus have not been shown to be resistant to pathogens and pests common to Physocarpus plants.