Four trial sites evaluated this accession through the 5-year period; two sites evaluated through the 10-year period. The Grand Rapids, MN and North Platte, NE sites reported all plants died from winter injuries by the tenth year. One tree survived through the 10-year evaluation period in Absaraka (Fargo), ND, but suffered from winter injuries and drought stress. The source of this tree, an isolated population from western Oklahoma, likely explains the lack of cold hardiness for the more northerly evaluation sites. The accession was recommended at the Urbana, IL site where the plants performance was rated as excellent with good form and leaf quality.
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Alnus rubra Ames 5909
No plants of this accession survived for five years at any trial site. Drought and cold stress were primarily cited for the loss of plants of this accession.
Ampelopsis cordata PI 495598
Four sites evaluated this accession through the 5-year period; two sites evaluated the accession through the 10-year period. Winter injuries killed all plants by the tenth year at the Absaraka (Fargo), ND and Chanhassen, MN sites. Both of these sites noted that other A. cordata accessions, including PI 495597, were cold hardy and more suitable than this accession. The Urbana, IL sites noted the accession had showy fruit displays and overall performance was excellent, but did not recommend it citing excessive growth. The Ft. Collins, CO site did recommend the accession but noted it was less vigorous than other vines and not as showy.
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Cercocarpus ledifolius Ames 8368
Three sites reported on living plants through the 5-year evaluation period. No sites reported on plants through the 10-year evaluation period. Heavy soils and general decline were cited as problems with this accession.
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Cotoneaster integerrimus 'Centennial' Ames 10333
Seven sites reported on this accession through the 5 and 10-year evaluation
periods. Four sites (Urbana, IL, Ames, IA, Chanhassen, MN, and Carrington,
ND) reported slight foliar damage during the growing season. The
Carrington site also reported that stems had severe fireblight problems.
The North Platte, NE, and Ames sites reported reddish fall color; the Carrington
site reported yellow shades of fall leaf color. The Ft. Collins,
CO site noted the foliage was fair with yellow, orange, and red fall colors.
The Urbana site reported the foliage was spare and dull. Of the five
sites reporting on flower production, all reported many flowers.
Three of those sites evaluated the flowers as average (Ft. Collins, Ames,
and Chanhassen), one as excellent (Grand Rapids, MN), and one as dull (Carrington).
The latter four sites and the North Platte site also reported the fruit
display as showy with many fruit. The North Platte site reported
the fruit display as only average in quantity and dull in show. Two
sites (Chanhassen and Grand Rapids) reported overall performance to be
excellent. The Ft. Collins and Ames sites rated overall performance
as medium; the Carrington site rated overall performance as poor.
The two Minnesota sites reporting each gave a qualified recommendation
to this accession citing nice foliage and colorful fruit, but also noting
irregular habit (Chanhassen) and some winter dieback (Grand Rapids).
The Ft. Collins site also gave a qualified recommendation noting the accession
was problem free but not overly showy. The Ames and Carrington sites
did not recommend the accession citing its open, sparse habit (Ames) and
fireblight problems (Carrington).
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Diospyros virginiana Ames 7990
Three sites reported on this accession through the 5 and 10-year periods. Slight foliar damage was reported at the Manhattan, KS site. No fall color was reported. The Urbana, IL and Manhattan sites reported that more time was needed prior to making any recommendation. The Ames, IA site did recommend the accession citing excellent foliage quality and the aesthetically pleasing tree form.
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Larix occidentalis Ames 8369
Five sites evaluated this accession through the 5 and 10-year periods. All sites reported that plants that lived through the 10-year period had clean foliage all season and no injuries. All sites reporting on leaf color (four sites) reported good yellow to yellow-gold fall color. All five sites reported the overall performance of this accession was excellent, and all five sites recommended it as well. The Ames, IA site noted the accession's dense growth and tolerance of wet conditions. The Grand Rapids, MN site noted the accession's nice form and foliage. The Waseca, MN site noted the tamarack-like form. The Absaraka (Fargo), ND site reported that the accession made a great tree with pyramidal form, rapid growth (8.2 meters by year 10), delicate bright green needles, and recommended its use as a specimen plant. The Madison, WI site noted its good performance but evaluated it as less attractive aesthetically than L. decidua.
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Lonicera involucrata PI 495898
Six sites reported on this accession through the 5-year evaluation period; four sites reported through the 10-year evaluation period. All plants at the Ames, IA site died of unknown causes prior to the end of the 10-year evaluation period. The Waseca, MN plants showed a general decline over the 10-year period. The Absaraka (Fargo), ND and Carrington, ND sites noted questionable hardiness. At Absaraka wetness many have caused decline. Both of these North Dakota sites noted severe leafspot problems. These two sites also reported only a few flowers and fruit per plant and of average quality. No site recommended this accession citing poor vigor, leafspot, and coarse foliage. The Grand Rapids site reported that more time was needed to better evaluate the accession.
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Physocarpus opulifolius 'Nugget' Ames 8402
Nine sites evaluated this accession through the 5-year period; seven sites reported on plants through the 10-year period. The Ames site noted yellowish fall color; the Madison site reported orange fall color. The Absaraka, Carrington, and Madison sites reported showy flower displays. The Ft. Collins and Ames sites reported average flower displays; the Orono and Chanhassen sites reported the flower display to be dull. The Madison site reported showy fruit display; all other sites reported average to dull fruit displays. Five sites reported some foliar damage including powdery mildew (Absaraka-Fargo, ND in wet years), leaf scorch (Ames, IA), late summer chlorosis (Absaraka), bleaching in full sun (Carrington, ND), and late summer leaf scab (Chanhassen and Waseca, MN). The Ft. Collins, CO, Orono, ME, and Madison, WI sites reported clean foliage all season. Four sites (Ft. Collins, Ames, Absaraka, and Carrington) reported overall performance to be medium. Three sites reported overall performance to be excellent (Grand Rapids, MN, Waseca, MN, and Madison). All eight sites that evaluated this accession through the 10-year period recommended it. Winter hardiness, growth, clean yellow-green foliage, and form were all cited as good ornamental features. The Ft. Collins site did note that the flowers were less showy against the yellow-green foliage in comparison to green-leaved ninebarks. The Chanhassen site noted declining foliage quality as the season progressed. The Ames site noted some leaf scorch as a qualifier to its recommendation, and the Absaraka site noted that pruning upkeep was required. The Madison, WI site reported the accession had superior leaf color to other similar cultivars. The Grand Rapids site noted that, for those who like shrubs with yellow-green foliage, this accession was a good plant to consider.
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Prunus fruticosa 'Scarlet' PI 478003
Ten sites reported on this accession through the 5-year period; six sites reported on the accession through the 10-year evaluation period. Winter injury was reported in Fairbanks, AK, and Urbana, IL noted some crown dieback, possibly from drought. The Manhattan, KS site reported severe disease problems, and some powdery mildew was reported at Carrington, ND. Four sites reported glossy, clean foliage throughout the summer. Yellowish fall color was noted in Absaraka (Fargo), ND and Carrington. Chanhassen, MN, and Urbana reported no fall color or ineffective fall color. Only the Chanhassen site reported the flowers to be showy. The Chanhassen, Absaraka, and Carrington sites reported fruit display to be showy. The Chanhassen site did note that the flower and fruit displays were variable from plant to plant. Excluding Fairbanks, AK, where winter dieback effectively pruned these plants, this reportedly compact accession stayed relatively true to form by averaging 1.5 meters in height and 1.6 meters in spread at the 10-year evaluation period. At 0.8 meters, the shortest plants on average were located at Grand Rapids, MN and Lincoln, NE; at 2.41 meters, the tallest plants on average were found at Carrington. Five sites recommended this accession citing attractive glossy foliage, and average-to-good flower and fruit displays. Four sites did not recommend the accession citing short life spans, disease problems, and suckering.
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Rubus parvifolius Ames 10167
Five sites evaluated this accession through the 5-year period; three sites evaluated through the 10-year period. The Fairbanks, AK site reported moderate winter injury. Four sites reporting on foliage quality reported leaves were clean all season, although the Carrington, ND site noted scattered leafspots. The Absaraka (Fargo), ND and Carrington sites reported the flower display to be showy; the Urbana, IL and Fairbanks sites reported it to be dull. Fruit display was also reported to be showy at the two reporting North Dakota sites; the Urbana site reported fruit display as dull and too small to be effective. The Fairbanks site noted that the fruit appeared very late. The accession was never reported to be over one meter in height and was as wide as 3.7 meters at the Absaraka site. Three sites, Absaraka, Carrington, and Urbana, recommended this accession citing its groundcover qualities, low weed penetration, cascading potential, and foliage and flower qualities. The Fairbanks site gave the accession a qualified recommendation noting that, although it was hardy and had good groundcover potential, it may be invasive and was quite thorny. The Glencoe, IL site did not recommend the accession citing alarming growth potential and aggressiveness. This accession has been found to be aggressive at the USDA-ARS Plant Introduction Station as well and can be spread by birds eating and depositing seeds. It is recommended only for very controlled settings.
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Weigela florida 'Samba' Ames 5883
Two North Dakota sites, Absaraka (Fargo) and Carrington, evaluated this accession through the 5 and 10-year evaluation periods. Freezeback was a common problem at both sites and wet soils at Absaraka caused poor vigor as well. The foliage was reported clean all season with bronzy-purple tones. Pink flowers, while few, were showy. Fruit display was unremarkable. The Carrington site did not recommend the accession citing questionable hardiness and the Absaraka site questioned whether or not to recommend the accession noting it was a good accent plant but in protected areas only.
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Wisteria frutescens ssp. macrostachya Ames 2774
Five sites evaluated this accession through the 5-year period, four
sites evaluated the accession through the 10-year period.
The three sites that reported on foliage noted it was clean all season.
The Chanhassen, MN site noted slight yellow fall color. The plants
failed to bloom in Absaraka (Fargo), ND. The Madison, WI, Glencoe,
IL, and Chanhassen sites reported showy flower displays. The Chanhassen
and Madison sites noted overall performance to be excellent. The
Waseca, MN, Absaraka, and Glencoe sites reported medium performance
for the accession. Three sites (Glencoe, Chanhassen, and Madison)
recommend the accession. The Glencoe site noted that the accession
was not as ornamental as Asian species but that the repeat flowering was
a plus. The Chanhassen site reported the species the accession belonged
to appeared to be the hardiest of the wisterias although it still suffered
some dieback in severe winters. The Madison site reported excellent
flower display and that the species appeared to be the hardiest of the
Wisterias. The Waseca and Absaraka sites questioned the accessions
performance and did not recommend it one way or the other. The Waseca
site's plants were as yet too small to assess due to mower damage.
The Absaraka site needed more evaluation time as the accession had yet
to bloom and was of questionable hardiness. For more information
on this accession, please refer to the article by Robert Schutzki and Mark
Widrlechner, "New Plants on Trial," American Nurseryman, May 1, 1996, 38-46.
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