Aronia x prunifolia

Identity

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Preferred Scientific Name

Aronia x prunifolia (Marshall) Rehder (1938)

Other Scientific Names

Aronia atropurpurea Britton (1901)
Aronia floribunda (Lindl.) Sweet (1826)
Aronia prunifolia Marshall
Crataegus laetifica Sarg. (1910)
Crataegus persimillis Sarg. (1903)
Crataegus prunifolia (Poir.) Pers. (1807)
Mespilus prunifolia Marshall (1785)
Photinia floribunda (Lindl.) K.R. Robertson & J.B. Phipps (1991)
Pyrus floribunda Lindl. (1826)

Local Common Names

Canada: Aronie à feuilles de prunier; Aronie à fruits mauves
China: Zi guo xian lei hua qiu
Estonia: must aroonia
Finland: koristearonia
France: Amélanchier à fruits mauves; Aronie à feuilles de prunier; Aronie à fruits mauves
Korea, Republic of: tannamu
Netherlands: bastardappelbas; zwarte appelbes
Norway: svartsurbær
Sweden: slånaronia
UK: purple chokeberry
USA: hybrid chokeberry; plumleaf hawthorn; purple chokeberry; purple-fruited chokeberry

Summary of Invasiveness

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The hybrid A. x prunifolia is a shrub with attractive white flowers and purple fruits that can spread vegetatively as well as by seed. It originated in North America and is now grown widely as an ornamental in other parts of the world. It has not been widely reported as an invasive species, but Wiegers (1983; 1984) describes how it has spread rapidly in Phragmites australis reed beds in the Netherlands since 1900. Ozinga et al. (2007) record it among the small number of invasive plant species in the Netherlands. It shows invasive tendencies in Latvia (Rutkovska and Jursevska, 2008), is listed as an agricultural weed in Canada (Darbyshire, 2003), as a ‘garden thug’ in the UK (Clement and Foster, 1994) and as a threat to grasslands in Australia (Barker et al., 2006). It is a black-listed species for Norway (Gederaas et al., 2007). It appears in global lists of environmental or invasive weeds (e.g. by Cronk and Fuller, 1995), and clearly has the potential for invasive behaviour. Being widely grown as an ornamental is a further cause for concern.

Taxonomic Tree

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Domain: Eukaryota
Kingdom: Plantae
Phylum: Spermatophyta
Subphylum: Angiospermae
Class: Dicotyledonae
Order: Rosales
Family: Rosaceae
Genus: Aronia
Species: Aronia x prunifolia

Notes on Taxonomy and Nomenclature

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Aronia x prunifolia is a natural hybrid between Aronia melanocarpa and Aronia arbutifolia (Wiegers, 1983; USDA-ARS, 2009). It has been placed in various other genera, including Crataegus, Aronia, Mespilus, Sorbus and Pyrus (IOPI, 2009). USDA-NRCS (2009) and Phipps (1989) refer to it as Crataegus persimilis Sarg.; others, including Weakley (2007), as A. prunifolia. Not all sources equate C. persimilis or Crataegus prunifolia with A. x prunifolia. IOPI (2009) fails to suggest the synonymy and further equates only certain C. prunifolia (with authorities as in the Identity section of this datasheet) with C. persimilis. Weakley (2007) recognises that the taxon is a hybrid, but because of long establishment and ability to reproduce freely, suggests it be treated as a species – A. prunifolia (Marshall) Rehder. A number of horticultural variety names are listed by different horticultural suppliers.

Description

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A. x prunifolia is a rounded shrub or small tree, 2 to 4 m high with erect stems. It can spread vegetatively by suckers from the base. The leaves are alternate, simple, oblanceolate to obovate, 8-10 cm long, bright green above, paler and moderately pubescent below, turning bright red at the end of the season. The inflorescence is a corymb of 10-25 flowers, each about 1 cm across with five sepals and five white petals. Stamens white, numerous. The ripe fruits are dark purple, 7-12 mm in diameter. There are one to five seeds per fruit of the parent species of A. x prunifolia, which are flattened, broadly crescent-shaped, and amount to about 600,000 seeds per kg (about 2-3 mm long) (Gill et al., 2008). Presumably the seeds of A. x prunifolia are similar.

Plant Type

Top of page Perennial
Seed propagated
Shrub
Vegetatively propagated
Woody

Distribution

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USDA-ARS (2009) indicates quite wide distribution for A. x prunifolia in eastern USA and Canada. USDA-NRCS (2009) does not list A. x prunifolia and gives a much more restricted distribution for Crataegus persimilis in northeastern USA and just Ontario in Canada. These are generally regarded as synonymous, but there is perhaps some confusion of identity here.

Its distribution as an ornamental plant is certainly very much wider than is indicated in this datasheet. It is widely grown as an ornamental and almost certainly occurs in most, if not all, European countries and many of the states of USA and Canada not listed here, and in the more temperate countries of Asia (there are local names in Korea and China). However, information on its distribution is not readily confirmed.

Distribution Table

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The distribution in this summary table is based on all the information available. When several references are cited, they may give conflicting information on the status. Further details may be available for individual references in the Distribution Table Details section which can be selected by going to Generate Report.

Last updated: 10 Jan 2020

Continent/Country/Region	Distribution	Origin	Invasive	Reference	Notes
Europe
Belgium	Present	Introduced	Invasive	Wilde Planten (2009)
Czechia	Present, Localized	Introduced	Invasive	Pyšek et al. (2002)	Lednice, district Breclav: escaping from cultivation in the chateau park
Estonia	Present	Introduced		Vulla et al. (2009)	Eaten by brown bears
Finland	Present	Introduced		Enenonen (2009)
Germany	Present, Only in captivity/cultivation	Introduced		CABI (Undated)	Original citation: Dave's Garden (2009)
Latvia	Present, Localized		Invasive	Rutkovska and Jursevska (2008)	In Daugavpils city
Netherlands	Present, Widespread	Introduced	Invasive	Wiegers (1983); Wiegers (1984)
Poland	Present	Introduced		Szkudlarz and Celka (2005)
United Kingdom	Present, Only in captivity/cultivation	Introduced		Stace (1991)
North America
Canada	Present	Native		USDA-ARS (2009)
-New Brunswick	Present	Native		USDA-ARS (2009)
-Newfoundland and Labrador	Present	Native		Kemper Center for Home Gardening (2009)
-Nova Scotia	Present	Native		USDA-ARS (2009)
-Ontario	Present	Native		USDA-NRCS (2009)
-Quebec	Present	Native		USDA-ARS (2009)
United States	Present	Native		USDA-ARS (2009)
-Connecticut	Present	Native		USDA-ARS (2009)
-Illinois	Present	Native		USDA-ARS (2009)
-Indiana	Present	Native		USDA-ARS (2009)
-Kentucky	Present	Native		USDA-ARS (2009)
-Maine	Present	Native		USDA-ARS (2009)
-Maryland	Present	Native		USDA-ARS (2009)
-Massachusetts	Present	Native		USDA-ARS (2009)
-Michigan	Present	Native		USDA-ARS (2009)
-New Hampshire	Present	Native		USDA-ARS (2009)
-New York	Present	Native		USDA-ARS (2009)
-North Carolina	Present	Native		USDA-ARS (2009)
-Ohio	Present	Native		USDA-ARS (2009)
-Pennsylvania	Present	Native		USDA-ARS (2009)
-Rhode Island	Present	Native		USDA-ARS (2009)
-Tennessee	Present	Native		USDA-ARS (2009)
-Vermont	Present	Native		USDA-ARS (2009)
-Virginia	Present	Native		Kemper Center for Home Gardening (2009)
-West Virginia	Present	Native		USDA-ARS (2009)
-Wisconsin	Present	Native		USDA-ARS (2009)
Oceania
Australia	Present	Introduced		Barker et al. (2006)	Listed as a threat to Australia's grassland

History of Introduction and Spread

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It is believed to have been introduced to Europe from North America before 1700. Preston et al. (2002) recorded that it was introduced to the UK by 1791 and first noted in the wild in 1934. The first specimens recorded in the Netherlands are from 1875 (Wiegers, 1983) and it has spread rapidly in reed beds there since 1900. No other records have been located on the history of its spread outside the USA.

Introductions

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Introduced to	Introduced from	Year	Reason	Introduced by	Established in wild through		References	Notes
Introduced to	Introduced from	Year	Reason	Introduced by	Natural reproduction	Continuous restocking	References	Notes
Europe	North America	<1700	Horticulture (pathway cause)		Yes
Netherlands		1875	Horticulture (pathway cause)		Yes		Wiegers (1983)	first herbarium specimen
UK		1791	Horticulture (pathway cause)		Yes		Preston et al. (2002)	first recorded in the wild in 1934

Risk of Introduction

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The risk of introduction is clearly very high considering its widespread availability as an ornamental. However, it has probably already been introduced to most countries with a suitable climate and the main risks are from escape from cultivation and naturalization, as has apparently occurred in the Netherlands.

Habitat

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In the Netherlands, A. x prunifolia forms a dense scrub in Sphagnum bogs, Phragmites reed beds and in species-poor marshy Betula woodland along with Alnus glutinosa (Wiegers, 1984; Sýkora, 2006; W Tamis, Institute of Environmental Sciences, University Leiden (CML), The Netherlands, personal communication, 2009). Apart from growing in bogs, it occurs along forest trails, in heather (often in the vicinity of estates), scrub and woodland edges. In the UK, it is recorded from woodlands, plantations, hedgerows, parks and roadsides (Preston et al., 2002).

Habitat List

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Category	Sub-Category	Habitat	Presence	Status
Terrestrial
	Terrestrial – Managed	Rail / roadsides	Secondary/tolerated habitat	Natural
	Terrestrial – Managed	Urban / peri-urban areas	Principal habitat	Productive/non-natural
	Terrestrial ‑ Natural / Semi-natural	Natural forests	Secondary/tolerated habitat	Natural
		Natural grasslands	Secondary/tolerated habitat	Harmful (pest or invasive)
		Wetlands	Principal habitat	Harmful (pest or invasive)
		Scrub / shrublands	Secondary/tolerated habitat	Harmful (pest or invasive)

Hosts/Species Affected

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Although A. x prunifolia is listed an agricultural weed in Canada, it is not clear what crops are affected.

Biology and Ecology

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Genetics

Chromosome number of both the parents of A. x prunifolia i.e. Aronia melanocarpa and Aronia arbutocarpus, is 2n=34. It is possible that the hybrid is an allotetraploid, but this has not yet been confirmed (W Tamis, Institute of Environmental Sciences, University Leiden (CML), The Netherlands, personal communication, 2009).

Reproductive Biology

It is not clear to what extent this hybrid arises in the wild. It seems likely that most, if not all, of the plants in cultivation originate from North America although new hybrids are known to have been created by horticulturists. The fact that plants can be grown from seed and that it breeds true and appears stable suggests that the original hybridization took place a long time ago (VanDusen Botanical Garden, 2009). In the wild, it spreads both by seed and also from suckers from the roots. In cultivation, it may also be propagated vegetatively from cuttings or grafting. The flowers are fragrant and attract bees and butterflies, and are presumably cross-pollinated, although at least one of the parents (A. melanocarpa) is described as self-pollinated. The seeds need stratification (exposure to low temperature (1-5⁰C for 40-60 days) before they will germinate (Gill et al., 2008). Germination can occur at a range of pH values from 3 to 7 and the pH of ground water at sites in the Netherlands infested by the weed may vary from 3.3 to 6.3 (Wiegers, 1984).

Physiology and Phenology

A. x prunifolia is a typical temperate perennial, losing its leaves in winter, re-foliating and flowering in the early spring and flowering from April to July in the USA, fruiting from August to October. The fruits persist into mid-winter, but not much longer. Studies in the Netherlands showed plants up to at least 13 years old (Wiegers, 1984).

Nutrition

Wiegers (1984) recorded some correlation with high ammonium levels (1-4.5 mg/l).

Associations

In the Netherlands it is associated in the wild with Betula, Alnus, Phragmites and Sphagnum. Wiegers (1984) described a range of associations on infested sites in the Netherlands.

Environmental Requirements

A. x prunifolia is a typical deciduous temperate plant being frost-hardy, and requiring stratification for germination. Although it is recorded from very wet, acid Sphagnum bog situations in the wild, it is curiously also able to survive in quite dry, well-drained situations and is recorded as drought-tolerant and suitable for ‘xeriscaping’ as an ornamental (Dave’s Garden, 2009). It prefers full sun or only partial shade.

It tolerates a wide range of pH from highly acidic (pH 3.3) (Wiegers, 1984) to slightly alkaline (pH 7.8) (Dave’s Garden, 2009).

Wiegers (1984) recorded that it is found over a wide range of conditions from more or less oligotrophic to slightly brackish and moderately eutrophic conditions.

In the USA, it is regarded as hardy in USDA Hardiness Zones 4a (minimum temperature -30⁰C) to 8b (minimum temperature - 9⁰C) (Dave’s Garden, 2009).

Climate

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Climate	Status	Description
Cf - Warm temperate climate, wet all year	Preferred	Warm average temp. > 10°C, Cold average temp. > 0°C, wet all year
Cs - Warm temperate climate with dry summer	Tolerated	Warm average temp. > 10°C, Cold average temp. > 0°C, dry summers
Cw - Warm temperate climate with dry winter	Tolerated	Warm temperate climate with dry winter (Warm average temp. > 10°C, Cold average temp. > 0°C, dry winters)
Ds - Continental climate with dry summer	Tolerated	Continental climate with dry summer (Warm average temp. > 10°C, coldest month < 0°C, dry summers)

Latitude/Altitude Ranges

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Latitude North (°N)	Latitude South (°S)	Altitude Lower (m)	Altitude Upper (m)
65	40	0	0

Air Temperature

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Parameter	Lower limit	Upper limit
Absolute minimum temperature (ºC)	-30	0
Mean annual temperature (ºC)	5	10
Mean maximum temperature of hottest month (ºC)	0	30
Mean minimum temperature of coldest month (ºC)	-15	0

Rainfall

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Parameter	Lower limit	Upper limit	Description
Dry season duration	0	6	number of consecutive months with <40 mm rainfall
Mean annual rainfall	500	1200	mm; lower/upper limits

Rainfall Regime

Top of page Bimodal
Summer
Uniform
Winter

Soil Tolerances

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Soil drainage

free
impeded
seasonally waterlogged

Soil reaction

acid
neutral
very acid

Soil texture

heavy
light
medium

Special soil tolerances

infertile
other

Notes on Natural Enemies

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A. x prunifolia has few serious natural enemies, but there is some susceptibility to leaf spots and twig/fruit blight (Kemper Center for Home Gardening, 2009). It can also be host to mistletoe Viscum album (Barney et al., 1998).

Means of Movement and Dispersal

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Natural Dispersal (Non-Biotic)

It is spread mechanically when discarded from areas of cultivation.

Vector Transmission (Biotic)

Spread to reed beds in the Netherlands is thought to be due to birds (Wiegers, 1983).

Intentional Introduction

It is widely sold as an ornamental shrub and is therefore repeatedly introduced and cultivated in new sites.

Pathway Causes

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Cause	Long Distance	Local
Botanical gardens and zoos	Yes	Yes
Escape from confinement or garden escape		Yes
Garden waste disposal		Yes
Horticulture	Yes	Yes
Internet sales	Yes	Yes
Medicinal use	Yes	Yes
Nursery trade	Yes	Yes
Ornamental purposes	Yes	Yes
Seed trade	Yes	Yes

Pathway Vectors

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Vector	Long Distance	Local
Aircraft	Yes
Debris and waste associated with human activities		Yes
Mail	Yes	Yes

Impact Summary

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Category	Impact
Cultural/amenity	Positive
Economic/livelihood	Positive and negative
Environment (generally)	Negative
Human health	Positive

Economic Impact

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A. x prunifolia is listed as an agricultural weed in Canada, although it is not clear what crops are affected (Darbyshire, 2003). It is also listed as a threat to Australia’s grazing industries (Barker et al., 2006).

Environmental Impact

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Impact on Habitats

In the Netherlands, A. x prunifolia has invaded Sphagnum bog and Phragmites reed beds, modified the habitat and threatened a variety of native species. Occurrence in reed beds interferes with normal mowing management and ‘under its rapidly spreading canopy nearly all other species become suppressed, and the characteristic reed marsh vegetation is in imminent danger of disappearing’ (Wiegers, 1983).

Impact on Biodiversity

In the Netherlands, A. x prunifolia has invaded Sphagnum bog and Phragmites reed beds, modified the habitat and threatened a variety of native species (Wiegers, 1983; W Tamis, Institute of Environmental Sciences, University Leiden (CML), The Netherlands, personal communication, 2009).

Risk and Impact Factors

Top of page Invasiveness

Proved invasive outside its native range
Highly adaptable to different environments
Is a habitat generalist
Benefits from human association (i.e. it is a human commensal)
Long lived
Fast growing
Has high reproductive potential
Has propagules that can remain viable for more than one year
Reproduces asexually
Has high genetic variability

Impact outcomes

Ecosystem change/ habitat alteration
Modification of successional patterns
Reduced native biodiversity
Threat to/ loss of native species

Impact mechanisms

Competition - monopolizing resources
Competition - shading

Likelihood of entry/control

Highly likely to be transported internationally deliberately
Difficult to identify/detect in the field
Difficult/costly to control

Uses

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Economic Value

Apart from its value as an ornamental, the fruit of A. x prunifolia is high in vitamin C and exceptionally high in antioxidant phytochemicals, especially anthocyanins; all members of the flavonoid category of antioxidant phenolics. The berries can also be eaten fresh, but are very astringent and bitter and are mainly used in jams, jellies, wine and juice (Dave’s Garden, 2009; Fruit Bearing Trees, 2009).

The rich antioxidant content of Aronia spp. may be beneficial as a dietary preventative for reducing the risk of diseases caused by oxidative stress. Preliminary results show benefits of Aronia anthocyanins in colorectal cancer, cardiovascular disease, chronic inflammation, gastric mucosal disorders (peptic ulcer), eye inflammation (uveitis) and liver failure (Wikipedia, 2009). These results probably refer to work with the parent Aronia species, but seem likely to apply also to A. x prunifolia.

Uses List

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Environmental

Amenity

Medicinal, pharmaceutical

Source of medicine/pharmaceutical

Ornamental

Seed trade

Similarities to Other Species/Conditions

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Aronia arbutifolia (‘red chokeberry’), one of the parents of the hybrid A. x prunifolia, differs in having leaves densely pubescent beneath, sepals glandular, and red berries. The other parent, Aronia melanocarpa (‘black chokeberry’), is a smaller shrub, rarely exceeding 1 m, with smaller leaves, glabrous beneath, larger flowers that are 1.5 cm across, glabrous sepals, and black fruits.

Weakley (2007) noted that these three Aronia taxa are distinguished from other Crataegus by the dark trichomes on the upper midribs, especially towards the base of the leaves. Unlike Crataegus they do not have spines.

Prevention and Control

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Due to the variable regulations around (de)registration of pesticides, your national list of registered pesticides or relevant authority should be consulted to determine which products are legally allowed for use in your country when considering chemical control. Pesticides should always be used in a lawful manner, consistent with the product's label.

Physical/Mechanical Control

In the Netherlands, mowing, burning and grazing have been used for control, but no detail is available.

Chemical Control

There are no reports of chemical control of this species, but Aronia melanocarpa is noted as susceptible to 2,4-D, dicamba and picloram (Benton District Soil and Water Conservation, 2009).