Phlox (amplifolia)
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Shelby J. French Propagation Manager Mt. Cuba Center 3120 Barley Mill Road Hockessin, Delaware 19707 302 239 8819 302 239 5366 (fax) sfrench@mtcubacenter.org http://www.mtcubacenter.org/ |
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| Family Scientific Name: | Polemoniaceae | ||
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| Family Common Name: | Phlox | ||
| Scientific Name: | Phlox amplifolia | ||
| Common Name: | largeleaf phlox | ||
| General Distribution: |
Native to North America, is found in the U.S. ranging from Indiana south to Alabama, from Missouri and Arkansas east to Virginia. |
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| Propagation Goal: | Plants | ||
| Propagation Method: | Vegetative | ||
| ProductType: | Container (plug) | ||
| Stock Type: | field grown | ||
| Time To Grow: | 3 months | ||
| Target Specifications: | Well-rooted 1 quart containers | ||
| Propagule Collection: |
Divisions collected in mid-October; Zone 7A/6B |
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| Propagule Processing: |
Large clumps of mature, 4 year old plants dug from field. Plants were approaching dormancy and had little foliage. |
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| Pre-Planting Treatments: |
"Plant has a rhizomatous habit which produces underground runners that slowly spread to form a large mass, though not aggressive, is easily separated. Divisions approximately 7.5 cm (3 in) in diameter. Potted into a 1 quart pot using basic potting media with added synthetic fertilizer. Any stems without foliage cut back to 5 cm (2 in). Stems with foliage, but less than 12.5 cm (5 in), were left intact." |
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| Growing Area Preparation/ Annual Practices for Perennial Crops: |
Divisions placed into a warm greenhouse with additional shade covering. Heat set at 15-21˚C (60-70˚F). Under 16 hour long-day length, high pressure sodium lights. |
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| Establishment Phase: |
Roots reached the sides of pots after 5-7 weeks of potting. |
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| Length of Establishment Phase: | 5 weeks | ||
| Active Growth Phase: |
New growth observed at 5 weeks from the base, continued to emerge until 10 weeks. Any old growth that had been left during initial division was removed at the base once new growth emerged. |
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| Length of Active Growth Phase: | 3 months | ||
| Hardening Phase: | Plants were grown in a warm greenhouse at 15-21˚C (60-70˚F) until exhibiting dormant characteristics. March 1 moved to a cool greenhouse for remaining winter stratification, 4˚C (40˚F). | ||
| Outplanting performance on typical sites: | Plants ready to be outplanted in May, 7 months from dividing and 2 months from winter dormancy. 10 of 58 plants failed to break dormancy and were discarded. | ||
| Other Comments: |
"Cuttings were taken from actively growing divisions in January and February at a 5 week interval. The key to identification from Phlox paniculata is the long corolla tubes, and presence of pubescence on its wide leaves, and stems. Species appears resistant to powdery mildew. " |
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| References: |
Lady Bird Johnson Wildflower Center. (2017-11-16). Retrieved from https://www.wildflower.org/plants/result.php?id_plant=PHAM7 Missouri plants. (2018). Retrieved from http://www.missouriplants.com/blueopp/Phlox_amplifolia_page.html Mt. Cuba Center research report. (2017). Retrieved from https://1x848d9mftq5g9wx3epiqa1d-wpengine.netdna-ssl.com/wp-content/uploads/2017/12/MtCuba-Phlox-Report.pdf Nature Serve Explorer. (2018) Retrieved from http://explorer.natureserve.org/servlet/NatureServe?searchName=Phlox+amplifolia U.S.D.A. Natural Resources Conservation Service. (n.d.) Phlox amplifolia. Retrieved from https://plants.usda.gov/core/profile?symbol=PHAM7 "Weakley, A. S. (2015, May 21). Flora of the Southern and Mid-Atlantic States. Retrieved from http://www.herbarium.unc.edu/FloraArchives/WeakleyFlora_2015-05-29.pdf" |
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Citation:
French, Shelby J.; Kniola, Ryan. 2020. Propagation protocol for production of Container (plug) Phlox amplifolia Plants field grown; Mt. Cuba Center Hockessin, Delaware. In: Native Plant Network. URL: https://NativePlantNetwork.org (accessed 2025/05/14). US Department of Agriculture, Forest Service, National Center for Reforestation, Nurseries, and Genetic Resources.
