UACES Facebook 2001 Plants

University of Arkansas Plant Evaluation Program
2001 Plants

2001 Final Report
January 2006

Plants initiated in Spring 2001:

This completes the seventh year of the statewide plant evaluation program. The current team of cooperators includes Dr. Jim Robbins, Dr. Jon Lindstrom, and Manjula Carter.

The three test sites are the Hope Research Center (USDA cold hardiness zone 8), the Little Rock/Cooperative Extension Service property (zone 7a), and the Fayetteville Horticulture Research farm (zone 6b). As much as possible the three test sites were prepared in a similar manner. Full sun plants were grown in row-type beds 3' wide with a 7' grass alley. Plants groups are planted together (i.e. trees are planted together). Trees are spaced 10' apart, shrubs 6' apart, and herbaceous perennials 4' apart. The Little Rock site was planted on March 23, 2001; Fayetteville was planted on March 23, 2001; Hope planted on March 22, 2001. Irrigation at all three sites is by a drip system. Plants were fertilized and mulched after planting. Post-emergent herbicides were used at all three test sites. No disease or insect control was implemented during the first year. To maintain a tree-like habit, trees are pruned following final growth measurements. Pruning consists of removing the bottom 1/3 of limbs. SHRUBS are NOT pruned. Final growth measurements were taken at Little Rock on October 10; Fayetteville on October 13; and Hope on October 19.

Weather for 2005 at all three test sites is summarized

2005 Average Monthly High and Low Temperatures

Bar chart showing 2005 Average Monthly High and Low Temperatures.  Link to larger picture. Select back button to return.

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Ratings

   

Width

Height

Caliper (6")

   Rating

(growth after 5 years)

Itea ilicifolia 

5

-

-

 
Itea oldhamii

5

-

-

 
Agarista populifolia LeprechaunTM

4

40

41

 
Crataegus species

1

 

131

4.4

Quercus x Crimson SpireTM

1

 

150

 
Gelsemium sempervirens Lemon DropTM [NO PHOTO]

5

-

-

 
Deutzia setchuenensis var. corymbiflora

CJ

-

-

 
Viburnum utile

1

42

74

 
Fontanesia fortunei 'Titan'

5

133

127

 
Cotinus obovatus [NO PHOTO]

CJ

-

-

 
Acer negundo 'Sensation'

5

 

151

3.9

Pyrus fauriei Korean SunTM

5

 

86

2

Thuja x 'Green Giant'

1

118

67

 
Agapanthus 'Headbourne Hybrids'

CJ

-

-

 

Rating Key

CJ = cannot judge due to insufficient information or other reasons
1 = Plant has performed well statewide
2 = Plant has performed well in zones 7a and 8.
3 = Plant performed fair statewide
4 = Plant performed fair zones 7a & 8
5 = Plant not recommended
6 = Plant performed well in 6b, poor in 7a & 8
7 = Plant performed fair in 6b, poor in 7a & 8
 

Average Plant Size

Bar chart showing Average Plant Size for Fayetteville, Little Rock, and Hope. Link to larger picture. Select back button to return.

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Aqarista populifolia  LeprechaunTM

Picture of Agarista populifolia Leprechaun™ form. Link to larger picture. Select back button to return.

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Flowerwood Nursery donated 3-gal plants. Performance appears to be good at Hope. All three plants died at Little Rock by the fall of 2004. The plants are declining in Fayetteville. Flowers were first noted in early May and continued for about 1 week at Hope. Average plant size statewide is 30" tall by 33" wide with a growth index of 0..567 m3. Average plant height at Hope, which is probably more typical, is 40" with a width of 41". Based on our statewide results it would appear that this plant is a fair landscape plant for zone 8.

 

Bar chart showing Shoot Size in width and height of Agarista Populifolia Leprechaun for Hope, Little Rock, and Fayetteville. Link to larger picture. Select back button to return.

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Gelsemium sempervirens  Lemon DropTM

Flowerwood Nursery donated 1-gal plants. All plants are dead statewide. Little Rock lost two of the three plants in 2002. Hope lost all plants that summer also. Based on our results, this plant would not be recommended for Arkansas landscapes.

[No photo available]

 

Bar chart showing Shoot Size in width and height of Gelsemium sempervirens Lemon Drop for Hope, Little Rock, and Fayetteville. Link to larger picture. Select back button to return.

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Pyrus fauriei  Korean SunTM

Picture of Pyrus fauriei Korean Sun™ flower and form. Link to larger picture. Select back button to return.

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J. Frank Schmidt Nursery donated 4' BR plants. So far, the plant is performing poorly at all three locations. Habit is more like a crabapple and foliage is thin. In Fayetteville, the trees flowers in late March and then set a significant amount of fruit. Foliage that remains healthy at the end of the season has a nice deep maroon fall color. Average tree height statewide is 86" tall with a trunk caliper (@ 6") of 2.0". This small tree would not be recommended for Arkansas.

 

 Bar chart showing Shoot Size in width and height of Pyrus fauriei Korean Sun for Hope, Little Rock, and Fayetteville. Link to larger picture. Select back button to return.

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Bar chart showing Shoot Size in width and height of Pyrus fauriei Korean Sun for Hope, Little Rock, and Fayetteville. Link to larger picture. Select back button to return.

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Itea ilicifolia

Picture of Itea ilicifolia form. Link to larger picture. Select back button to return.

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University of Arkansas propagated plants and they were planted from a 1-quart container. All of the nine original plants were dead as of fall 2004. The oak-like foliage is very attractive. Emerging foliage is a beautiful copper color. Based on these field results this broadleaf evergreen plant would not be recommended for general use in Arkansas landscapes.

Bar chart showing Shoot Size in width and height of Itea ilicifolia for Hope, Little Rock, and Fayetteville. Link to larger picture. Select back button to return.

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Itea oldhamii

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University of Arkansas propagated plants and they were planted from a 1-quart container. All plants at Hope and Fayetteville were dead as of the fall of 2004. Plants in Little Rock continue to decline. The plants in LR flower with a peak around mid-March. Flowers are actually quite impressive. The white spikes are shorter than Itea virginica but still showy. Average size in LR is 31" tall x 9" wide. Based on these field results this broadleaf evergreen plant would not be recommended for general use in Arkansas landscapes. 

Bar chart showing Shoot Size in width and height of Itea oldhamii for Hope, Little Rock, and Fayetteville. Link to larger picture. Select back button to return.

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Crataegus species

University of Arkansas seed-propagated plants from a stock plant at Blossomberry Nursery in Clarksville, AR. This plant is from a 1970's distribution from the U.S. National Arboretum. At this time we have no further information on its identity. Trees were planted as a 1-gal container plant.

The plant continues to grow very well at all three sites. Not a single plant has died statewide. Plants began to flower in 2003. Flowering occurs in mid-April and lasts about 2 weeks. The fruits are very attractive, 1/3", yellow color. In September a significant number of leaves are affected by some type of leaf spot disease. The leaf disease does not seem to detract from the overall aesthetic quality. Statewide tree height is 131" with an average trunk caliper (@ 6") of 4.4". This hawthorn has performed well statewide and would be a nice recommendation for a small ornamental tree similar to a crabapple.

 

 


Quercus x Crimson SpireTM (Q. x bimundorum 'Crimschmidt')

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J. Frank Schmidt Nursery donated 3' BR whips. Trees are growing well at all three test sites. Fall color was almost non-existent at all three sites in 2001 to 2004. We suspect that color in northern states with cooler temperatures would be better. Significant red fall color developed in Fayetteville in fall 2005. Some large acorns were noted at Fayetteville. In size they resemble the fastigiated English oak parent. Acorns were viable based on testing at Fayetteville. Although powdery mildew appeared in Fayetteville, it was 95% less than fastigiate English oak. Statewide tree height is 150". In fall 2005 we stopped measuring the trunk caliper as this was difficult at 6" due to multiple branches emerging at that level. This tree would be highly recommended for all parts of Arkansas and would be useful in situations where a narrow, columnar tree is required.

Bar chart showing Shoot Size in width and height of Crimson Spire Oak for Hope, Little Rock, and Fayetteville. Link to larger picture. Select back button to return.

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Bar chart showing Shoot Size in width and height of Crimson Spire Oak for Hope, Little Rock, and Fayetteville. Link to larger picture. Select back button to return.

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Deutzia setchuenensis var.  corymbiflora

Picture of Deutzia setchuenensis var. corymbiflora flower and form. Link to larger picture. Select back button to return.

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University of Arkansas propagated plants and they were planted from a 1-quart container. Sadly, all three test plants were stolen from the Little Rock site when this plant was in full flower.

We are still very impressed with the length of flowering on this shrub. Plants at Hope starting flowering in late April and until early November. Plants in Fayetteville begin to flower in late July and continue to frost. We don't expect that this extended bloom time will continue on mature plants. The source plant on the University of Arkansas campus (now mature) flowers once in late May and no repeat bloom occurs. Due to the fact the three plants were stolen in Little Rock and some over-ambitious Roundup spraying in Fayetteville, we will be re-evaluating this plant in 2003.

Average plant size statewide is 38" tall by 30" wide. 

Bar chart showing Shoot Size in width and height of Deutzia setchuenensis var. corymbiflora for Hope, Little Rock, and Fayetteville. Link to larger picture. Select back button to return.

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Viburnum utile

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University of Arkansas propagated plants and they were planted from a 1-quart container. Performance of this broadleaf evergreen is good at all three sites. Two of the three plants growing at Little Rock were stolen in 2001. Plants began to flower at Hope and Little Rock in 2003. Flowering is in mid-April and lasts for about 2 weeks. Average plant size statewide is 42" tall by 74" wide. This broadleaf evergreen shrub, while slow to start, is highly recommended for the entire state. 

Bar chart showing Shoot Size in width and height of Viburnum utile for Hope, Little Rock, and Fayetteville. Link to larger picture. Select back button to return.

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Fontanesia fortunei ' Titan'

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University of Arkansas 
propagated plants and they were planted from a 1-quart container. Growth rate is unbelievable at all three sites. Flowering is typically in early to mid-April. Flowers are slightly showy. Average plant size statewide is 133" tall by 127" wide. Interestingly, the smallest plants (107" tall x 102" wide) was at Hope, which is zone 8. This plant might make a good screen but the amount of seed produced is of some concern. There is no fall color. This plant is a very aggressive grower with minimal landscape value (e.g. showy flowers and fruits, showy fall color). Plants at Fayetteville began to decline in year 5 with a significant amount of large branch die-back noted. 

Bar chart showing Shoot Size in width and height of Fontanesia fortunei 'Titan' for Hope, Little Rock, and Fayetteville. Link to larger picture. Select back button to return.

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Thuja x 'Green Giant'

Picture of Thuja x 'Green Giant' form. Link to larger picture. Select back button to return.

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The Botany Shop, Joplin, MO, donated 1-gal plants. Performance was outstanding at Hope, however, one plant died at Little Rock from what was identified as Pythium/Phytophthora following a wet spring. Bagworms were observed on plants at all three locations. Average plant size statewide is 118" tall by 67" wide. This needle evergreen is highly recommended as a hedge or screen plant for all parts of Arkansas. 

Bar chart showing Shoot Size in width and height of Thuja x 'Green Giant' for Hope, Little Rock, and Fayetteville. Link to larger picture. Select back button to return.

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Acer negundo ' Sensation'

Picture of Acer negundo 'Sensation' form. Link to larger picture. Select back button to return.

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J. Frank Schmidt Nursery donated 7' BR whips. Growth was fair at all three sites. Foliage at all three sites was less than attractive. Leaves are just severely distorted in June by leafhoppers. Foliage that developed later in the season displayed less of this leaf distortion. Plants exhibited no fall color. Average tree height is 151" with an average trunk caliper (@ 6") of 3.9". This deciduous shade tree should not be recommended in Arkansas.  

Bar chart showing Shoot Size in width and height of Acer negundo 'Sensation' for Hope, Little Rock, and Fayetteville. Link to larger picture. Select back button to return.

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 Bar chart showing Shoot Size in width and height of Acer negundo 'Sensation' for Hope, Little Rock, and Fayetteville. Link to larger picture. Select back button to return.

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Cotinus obovatus

J.Frank Schmidt Nursery donated 1-gal plants. All but one of the American smoketrees are dead. It would appear that our intense summer heat is too hard on this outstanding plant when grown in full sun.

[No photo available]

 

Bar chart showing Shoot Size in width and height of Cotinus obovatus for Hope, Little Rock, and Fayetteville. Link to larger picture. Select back button to return.

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Bar chart showing Shoot Size in width and height of Cotinus obovatus for Hope, Little Rock, and Fayetteville. Link to larger picture. Select back button to return.

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Agapanthus ' Headbourne Hybrids'

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One quart plants were purchased from Colvos Creek Nursery, WA. Plants are performing fair at Little Rock and Hope. Plants in Fayetteville are multiplying nicely and began flowering in late June. Plants at Hope and LR begin flowering the second week of June and flower for at least one month. Agapanthus might be suitable in zone 8. 

 


The Ornamentals team would like to express their sincere appreciation to the cooperating nurseries (Flowerwood Nurseries, J. Frank Schmidt Nursery, and The Botany Shop) for donating the plants for this season's trial and to the Arkansas Green Industry Association for financial support.