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Physocarpus capitatus Tilden Park

Physocarpus capitatus Tilden Park
Pacific Ninebark

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Completely satisfied with my order. Thanks to the individuals responsible for order processing, quality control, and shipping.

Irène, 31/12/2023

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This plant carries a 24 months recovery warranty

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Value-for-money
A different Physocarpus, not widely planted in our gardens despite its robustness. It has a prostrate habit and forms a wide ground cover adorned with silky maple leaves, initially purple and then turning green. Its spring flowering, in large flat corymbs, attracts bees and butterflies, and is followed by small red fruits that remain decorative for a long time. This deciduous bush grows in acidic, neutral or very slightly calcareous soil, even occasionally dry, in partial shade or in full sun.
Flower size
8 cm
Height at maturity
1 m
Spread at maturity
2.50 m
Exposure
Sun, Partial shade
Hardiness
Hardy down to -23°C
Soil moisture
Moist soil
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Best planting time March, October
Recommended planting time February to May, September to November
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Flowering time May to June
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Description

Physocarpus capitatus 'Tilden Park®' is a prostrate form of a robust but little-known Physocarpus, native to the western United States. Still not widely available, this unusual bush has a prostrate habit and forms a wide ground cover adorned with lobed and dentate leaves similar to those of maples, silky and purplish at budbreak, turning green at maturity. Its spring flowering, white and in large flat corymbs, is highly attractive to bees and butterflies, giving way to small red fruits that remain decorative on the branches until late in the season. Other advantages of this sturdy ground cover are its ease of cultivation in any slightly acidic to non-calcareous soil, and its good resistance to summer drought once established.

 


Physocarpus capitatus (synonymous with Opulaster capitatus or Spiraea capitata) belongs to the Rosaceae family, and is native to the western United States, from southern Alaska to eastern Montana and Utah, and south to California. It is mainly found in wet places, forming thickets along rivers and in forests. This very hardy bush shows a good tolerance to summer drought, to the point that it is commonly planted in Californian gardens. This Physocarpus gets its English name of "newbark" from the appearance of its scaly white bark, which peels off in ribbons as it ages, forming flakes. The name Physocarpus comes from the Greek 'phusa' which means air bubble or vesicle, and 'karpos' which refers to the fruit, in reference to the shape of the fruit.

The cultivar 'Tilden Park', discovered in 1963 in California, stands out with its prostrate, ramified and compact habit, supported by several "trunks" and branches that arch gracefully towards the ground. This bush has a medium to slow growth rate and will not exceed 1m (3ft) in height and 2.50m (8ft) in width when fully grown. In our gardens, it will reach a height of about 50cm (20in) and a spread of 1m (3ft) at the age of 10 years.

Its deciduous foliage may partially persist depending on the severity of the winter. It consists of large leaves, 8cm (3in) wide, slightly sticky and coloured purple at budbreak. The mature leaves are dark green, covered in fine hairs, deeply lobed, with serrated edges. Before falling, they turn yellow. The flowering takes place in May-June. The bush is adorned with a beautiful white flowering, in the form of tiny flowers gathered in dense, fluffy and flat corymbs, 8cm (3in) wide. This flowering is followed by curious red and swollen fruits that are appreciated by birds in autumn.

 

Physocarpus 'Tilden Park' is one of those shrubs that can thrive on their own once well established and can tolerate the root competition of large trees on the edge of a grove. Unknown to many gardeners, it is more often offered to professionals for urban landscaping, proof of its robustness and tolerance to pollution, summer drought and even sea spray. It will find its place along the edge of flowerbeds or groves, in sunny, semi-shady or even shady areas where it will keep weeds in check. For example, it can be combined with sturdy shrubs such as the hedge honeysuckle (Lonicera xylosteum), with light, golden foliage (Euonymus japonicus 'Aureovariegata'Leycesteria formosa 'Golden Lanterns'), or with silver foliage (shrubby wormwoods). It also pairs well with Japanese spireas, small viburnums (Viburnum trilobum 'Bailey Compact'), dwarf winged euonymus (Euonymus alatus 'Compactus') or Neillia (Neillia affinis). To accompany it, you can plant Heucheras or Heucherellas at its base. It also looks great planted in a container on a terrace or balcony.


 

Physocarpus capitatus Tilden Park in pictures

Physocarpus capitatus Tilden Park (Foliage) Foliage
Physocarpus capitatus Tilden Park (Plant habit) Plant habit

Plant habit

Height at maturity 1 m
Spread at maturity 2.50 m
Habit Irregular, bushy
Growth rate normal

Flowering

Flower colour white
Flowering time May to June
Inflorescence Corymb
Flower size 8 cm
Bee-friendly Attracts pollinators
Flowering description White corymbs.
Fruit colour red

Foliage

Foliage persistence Deciduous
Foliage colour dark green
Foliage description Deciduous - opening purple but turning green.

Botanical data

Genus

Physocarpus

Species

capitatus

Cultivar

Tilden Park

Family

Rosaceae

Other common names

Pacific Ninebark

Origin

Cultivar or hybrid

Product reference841981

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Planting and care

Plant Physocarpus capitatus 'Tilden Park' in early spring or autumn, in deep, ordinary soil, preferably acidic, neutral or even slightly calcareous and relatively dry in summer. Clay-sandy, peaty, sandy, clayey, loamy or clay-humiferous soil are suitable for this bush, which requires very little maintenance once established. However, it is best to avoid allowing the soil to dry excessively in hot and dry regions during summer. This bush will thrive in partial shade, or even in shade in hot climates or in full sun elsewhere, but it will be more floriferous and denser if planted in a well-sunlit location. Thin out dense plants by severely cutting back some of the stems after flowering. The physocarpus tends to produce many suckers, to the detriment of the main plant; it may be useful to prune it to give it a denser appearance.

Diseases such as fire blight, powdery mildew, and downy mildew can occur. To prevent fungal diseases, treat with Bordeaux mixture in spring. If ulcers appear on the wood, it may be fire blight: remove the infected branches as quickly as possible and destroy them by burning.

Planting period

Best planting time March, October
Recommended planting time February to May, September to November

Intended location

Suitable for Meadow, Woodland edge
Type of use Border, Edge of border, Container, Slope
Hardiness Hardy down to -23°C (USDA zone 6a) Show map
Ease of cultivation Beginner
Planting density 1 per m2
Exposure Sun, Partial shade
Soil pH Neutral, Calcareous
Soil type Clayey (heavy), Clayey-chalky (heavy and alkaline), Silty-loamy (rich and light)
Soil moisture Moist soil, Deep, flexible, well-draining

Care

Pruning instructions Aerate the plants that are too dense by severely cutting back some of the arched stems after flowering. The physocarpus tends to produce many suckers, to the detriment of the mother plant; it may be useful to coppice it to give it a denser appearance.
Pruning Pruning recommended once a year
Pruning time August, November
Soil moisture Moist soil
Disease resistance Average
Overwinter Can be left in the ground
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