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Purpleleaf Sandcherry a Color of RHS 187A Or 187B

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Purpleleaf Sandcherry a Color of RHS 187A Or 187B HORTSCIENCE 56(7):849–850. 2021. https://doi.org/10.21273/HORTSCI15866-21 wide with broadly acute apices and bases. The leaf margins are evenly serrulate. The VR ‘ ’ upper and lower blade surfaces are slightly UCONNPC001 (Darkstar ) embossed with pinnate veins, but are other- wise glabrous. Petioles are 10 mm long with Purpleleaf Sandcherry a color of RHS 187A or 187B. Leaf color is dependent on light levels, with greater light Mark H. Brand and Bryan A. Connolly producing deeper and brighter purple/red Department of Plant Science and Landscape Architecture, University of hues. The following leaf colors are all for Connecticut, 1376 Storrs Road, Storrs, CT 06269-4067 plants growing under high light conditions. The upper and lower surfaces of young devel- Additional index words. compact form, landscape adaptability, low-maintenance plant, oping leaves are close to RHS 60A, 60B, pollinator plant, purple foliage, Rosaceae 46A, and 185A. Fully expanded young leaves (early July) have upper surfaces that are close The purpleleaf sandcherry, Prunus Âcis- upright growth habit, does not produce basal to RHS 187A, and lower surfaces that are tena,wasfirst released in 1910 by N.E. Han- branches, and plants become open at the base close to RHS 59A and 187C (Fig. 3). Fully sen at the South Dakota Agricultural and develop a “leggy” form. Furthermore, expanded old leaves (early September) have Research Station (Jacobson, 1992). This hy- without regular pruning back of branches, the upper surfaces that are close to RHS 139A brid was the result of a cross between Prunus usual form of P. Âcistena tends to develop and 187A, and lower surfaces that are close pumila var. besseyi (syn. Prunus besseyi), a branches that flop over with age. Too often, to RHS 189A and 147A. cold hardy shrub of North America, and Pru- P. Âcistena is purchased and installed in ‘UCONNPC001’ produces numerous small nus cerasifera var. atropurpurea (cherry landscapes at a small size, but then grows too flowers that occur along the length of the pre- plum or myrobalan plum), a native of western large for its intended use and space. vious season’s annual growth (Fig. 4). There Asia and the Caucasus (Dirr, 2009; Jacobson, ‘UCONNPC001’ purpleleaf sandcherry is aretypically30to40flowers per 15-cm length 1992). P. pumila var. besseyi is variable, with a new cultivar of P. Âcistena that is superior of stem. Flowers occur at each node, generally a plant height ranging from 60 cm for P. to the original P. Âcistena primarily by being numbering four per node, but can vary between V pumila var. besseyi ‘P011S’ Pawnee Buttes R more compact both in height and width. In one and eight flowers. Flowers have five petals, to 150 cm for ‘Hansens’ (aka ‘Hansen’sBush addition, ‘UCONNPC001’ has a mounded are about 20 to 25 mm in diameter, last about Cherry’). Judging from the height of P. form, with a dense habit and many basal 10 to 14 d, and are lightly fragrant. Blooming Âcistena, it is likely that one of the taller branches, resulting in plants that are full at occurs in late April to early May in Connecti- forms of var. besseyi was used as a parent in the bottom, unlike P. Âcistena, which can de- cut. Prunus Âcistena are typically mostly ster- Hansen’s cross that first created P. Âcistena. velop a “leggy” base. ile as a result of their interspecific origin, but Most of the P. Âcistena in the horticultural fruit development has been observed occasion- trade is probably the original clone intro- Origin ally on ‘UCONNPC001’. When present, fruit duced by Hansen in 1910, although cultivars are usually solitary, 1 to 2 cm in diameter, and exist, such as Big Cis and Minnesota Red. ‘UCONNPC001’ originated from cross- shiny black (closest to RHS 202A and 187A). Prunus Âcistena reaches 2 to 3 m tall, pro- pollinations conducted during Spring 2012 duces single pink flowers in April to May, and between Prunus pumila ‘UCONNPP002’ Culture and Landscape Use has bright-red foliage that emerges in the (Jade ParadeVR ) sandcherry, as the female par- spring and stays fairly red through the summer ent, and Prunus cerasifera var. atropurpurea Plants of ‘UCONNPC001’ have excellent (Dirr, 2009). This hybrid appears to be mostly purpleleaf cherry plum, as the male parent. garden performance under a range of condi- sterile, but can produce occasional small, The new sandcherry plant was discovered tions but will perform optimally in well- dark-purple to black fruit. P. Âcistena is hardy and selected during Spring 2016 from within drained soils and with light shade to full sun to the warmer parts of U.S. Department of Ag- a group of 20 progeny grown in a controlled exposure. Cold hardiness has not been fully riculture zone 3 and can be grown to zone 7 environment at the University of Connecticut evaluated for ‘UCONNPC001’, but purple- (U.S. Department of Agriculture, Agricultural in Storrs, Conn. ‘UCONNPC001’ was select- leaf sandcherries tolerate winter minimum Research Service, 2012). Purpleleaf sand- ed for its compact growth form, full basal temperatures as low as about –35 C and are cherry is propagated easily from softwood cut- branching, heavy spring flowering, red sum- best adapted to locations receiving fewer than tings and has several landscaping uses that mer foliage, and vigorous growth. 50 summer days with temperatures exceeding include small groupings, as a patio plant, as a 30 C. ‘UCONNPC001’ has exhibited good focal-point shrub, for flowering effect, for pur- Description resistance to leaf spot diseases that are prob- ple-red foliage, or as a foundation plant. lematic on other P. Âcistena genotypes (J. Prunus Âcistena is typically sold as a 2- ‘UCONNPC001’ has a mounded and Pedersen, personal communication). Like P. to 3-gal container plant, but it grows to a ma- dense plant form that reaches a mature height Âcistena, ‘UCONNPC001’ responds well to ture size that is too large for many landscapes of 140 cm and a spread of 180 cm (Fig. 1). pruning if necessary. into which it has been installed. It has an Branching and foliage occurs all the way to ‘UCONNPC001’ is a smaller plant that the bottom of the crown, so the canopy is full only grows up to 140 cm tall and 180 cm from the ground to the top of the plant (Fig. Received for publication 16 Mar. 2021. Accepted wide. It has a mounded form, with a dense for publication 14 Apr. 2021. 2). The lateral branches of this cultivar are habit and many basal branches, so it remains Published online 14 June 2021. between 10 and 50 cm long, 2 to 3 mm in di- fully branched to the ground even as a mature We thank Cordelia Connolly for assisting with ameter, with 1- to 2-cm internodes. Branches plant. Profuse flowering on ‘UCONNPC001’ the cross-pollinations that created this cultivar. are held at a 45 to 60 angle from the stem, in April creates a strong display and makes M.H.B. is a Professor. are firm but flexible in strength, and have a the plant useful for supporting pollinators. B.A.C. is an Assistant Professor. smooth bark texture. The branch color is Like P. Âcistena, ‘UCONNPC001’ has Current address for B.A.C.: Department of Bio- close to Royal Horticultural Society (RHS) vibrant red summer foliage that provides logy, Eastern Connecticut State University, 83 200A, 200B, 200C and 200D. All colors in visual interest throughout the growing sea- Windham Street, Willimantic, CT 06226. ‘ ’ M.H.B. is the corresponding author. E-mail: the description were designated using the son. UCONNPC001 is highly adaptable [email protected]. RHS color charts (Royal Horticultural Socie- to a wide range of landscape conditions, ex- This is an open access article distributed under the ty, Flower Council of Holland, 1995). hibits resistance to leaf spot, and is easy to CC BY-NC-ND license (https://creativecommons. Leaves of ‘UCONNPC001’ are alternate, cultivate. We believe these traits make org/licenses/by-nc-nd/4.0/). elliptical, and about 7 cm long by 3.5 cm ‘UCONNPC001’ superior to P. Âcistena. HORTSCIENCE VOL. 56(7) JULY 2021 849 market-ready plants can be produced in 2 to 3years. Micropropagation can also be used to propagate ‘UCONNPC001’ clonally. Shoot multiplication in vitro can be achieved using Murashige and Skoog medium and vitamins (Murashige and Skoog, 1962), 0.5 mg/L ben- zyladenine, 3% sucrose, and 0.8% agar, with a pH of 5.7. Cultures should be maintained at around 25 C with a 16-h photoperiod of 40 mmol/m2/s provided by cool-white fluores- cent lights with a subculture cycle of between 28 and 35 d. An 8Â shoot multiplication rate Fig. 3. Brightly colored purple-red summer fo- Fig. 1. A 3-year-old container-grown plant of can be expected. Microshoots are easily root- ‘ ’ liage of ‘UCONNPC001’ sandcherry as seen UCONNPC001 sandcherry showing its com- ed (100% rooting) under nonsterile condi- pact, densely branched, and mounded habit. in early July in Connecticut. tions in clear plastic salad trays containing a 1:1 (v:v) peatmoss:vermiculite mix under fluorescent lighting. Microcuttings treated with 1000 ppm IBA in talc root in 3 weeks and can then be acclimated to drier air over a period of 10 to 14 d before being moved to a greenhouse. Greenhouse acclimation to avoid leaf desiccation can be challenging and is aided by the use of clear plastic humidity dome covers and 50% shadecloth. Availability ‘UCONNPC001’ was patented (US PP29575 P2) by the University of Connecti- Fig. 2. ‘UCONNPC001’ sandcherry produces lat- cut on 7 Aug.
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