Ninebark Physocarpus opulifolius Midnight = 'Jonight' (PBR)

Water

Ninebark (Physocarpus opulifolius 'Midnight') should be watered deeply to ensure the roots receive moisture, generally once a week for established plants. During the initial growth after planting or during periods of extreme heat or drought, water should be more frequent, possibly twice a week. Use a soaker hose or drip irrigation to provide a slow, steady supply of water, aiming for about 1 to 1.5 inches of water per week, whether from rainfall or irrigation. In winter, reduce watering since the plant is dormant and requires less moisture. Always check the soil moisture before watering to avoid overwatering, as Ninebark prefers a well-drained soil and does not tolerate being waterlogged.

Light

Ninebark thrives best in full sun to partial shade, requiring at least 6 hours of direct sunlight each day for optimal growth and foliage development. The perfect spot for this shrub would be an area that receives morning sun and some afternoon shade, especially in regions with hot summers. However, it can also adapt to shadier conditions, though with a reduced flowering display and possibly looser growth. Avoid deep shade, as this can lead to poor leaf color and reduced vigor.

Temperature

Ninebark is well-suited to a variety of climates and can handle a temperature range from approximately -30 to 100 degrees Fahrenheit. This hardy shrub prefers cooler climates and can suffer in areas with high summer heat if not provided some afternoon shade. The ideal temperature for vigorous growth and bloom production ranges from 60 to 70 degrees Fahrenheit. Adequate mulching can help regulate soil temperature and protect the roots in both extreme heat and cold conditions.

Pruning

Pruning Ninebark should be done to maintain its shape, encourage bushier growth, and remove any dead or diseased branches. The best time to prune is late winter or early spring before new growth starts. Thinning out older stems every few years helps to rejuvenate the plant. After blooming, light pruning can be done to shape the plant or to reduce size if necessary. Always use clean, sharp tools to make clean cuts.

Cleaning

As needed

Soil

Ninebark 'Jonight' thrives in well-drained loamy soil that has some organic matter mixed in. A pH ranging from neutral to slightly acidic (pH 5.5 to 7.0) is ideal. Amend poor soils with compost to improve fertility and structure.

Repotting

Ninebark 'Jonight' is typically grown in the landscape rather than in containers, so repotting is not generally necessary. If grown in containers, repotting every 2-3 years or when rootbound is recommended.

Humidity & Misting

Ninebark 'Jonight' is adaptable to a wide range of humidity conditions and does not require any specific humidity level. It will do fine in the varying humidity levels commonly found outdoors.

Suitable locations

• Indoor

  Not ideal inside; needs full to part sun, well-draining soil.

• Outdoor

  Plant in sun/part shade, in well-draining soil, water regularly.

• Hardiness zone

  3-7 USDA

Life cycle

Physocarpus opulifolius Midnight, commonly known as Ninebark 'Midnight', begins its life cycle as a seed, which germinates in the spring under suitable temperature and soil moisture conditions. The seedling then grows into a young plant, establishing a root system and producing its first leaves. As it matures, Ninebark 'Midnight' develops woody stems and a rounded, bushy growth habit, reaching up to 5 to 6 feet tall and wide. The plant blooms in late spring to early summer, producing clusters of white or pink flowers that attract pollinators and subsequently, if pollinated, develop into small red fruits (follicles) that may persist into winter. Throughout its lifetime, Ninebark 'Midnight' will undergo seasonal cycles of growth, flowering, and dormancy, typically with vibrant foliage that can include shades of purple, red, and green. This deciduous shrub has a relatively long lifespan and can continue its cycle for several years, with proper care and favorable conditions.

Propogation

• Propogation time

  Spring to Summer

• Propogation: The Ninebark 'Jonight', commonly known as Physocarpus opulifolius Midnight, is typically propagated by softwood cuttings. This method is considered the most popular due to its effectiveness and simplicity. To begin, healthy, new-growth stems are selected in late spring or early summer when they are still green and flexible. Cuttings should be about 4 to 6 inches long, with a clean cut just below a leaf node. Leaves on the lower half of the cutting are removed, and the cut end is often dipped in a rooting hormone to encourage root development. The cuttings are then placed in a well-draining soil mix, ensuring that at least two sets of leaf nodes are buried. A high humidity environment is maintained for the cuttings to root, which usually occurs within a few weeks.