Paulownia tomentosa

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Authors: Mandy Tu, Global Invasive Species Team, The Nature Conservancy

Contents


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Taxonomy
Kingdom: Plantae
Phylum: Magnoliophyta
Class: Magnoliopsida
Order: Scrophulariales
Family: Scrophulariaceae
Genus: Paulownia
Species: tomentosa
Scientific Name
Paulownia tomentosa
(Thunb.) Sieb. & Zucc. ex Steud.
Scientific Name Synonym
Paulownia imperialis
(Thunb.) Sieb. & Zucc. ex Steud.
Common Names

princesstree, princess tree, royal paulownia, royal empresstree

Overview

Appearance
Paulownia tomentosa is a medium sized tree (50-60 ft. [15.2-18.3 m] in height and 2 ft. [0.6 m] in diameter) that can commonly be mistaken for the native tree northern catalpa (Catalpa speciosa). Bark is gray-brown and rough, often developing lighter-colored shallow vertical fissures.
Foliage
Leaves are large, broadly oval to heart-shaped (6-12 in. [15.2-30.5 cm] long, 5-9 in. [12.7-22.8 cm] wide) and arranged opposite along the stem, hairy on both surfaces. Petioles are also hairy and can be sticky when young. Leaves growing off root sprouts have been measured up to 2 ft. (0.6 m) in length. Twigs are stout, brown, and speckled with white dots (lenticels). They can be slightly hairy when young. Lateral leaf scars are somewhat round, becoming darker and sunken. The pith is chambered or sometimes hollow.
Flowers
Large flowers (2 in. [5.1 cm] long) are fragrant and light violet-pink, appearing in showy upright clusters (8-12 in. [20.3-30.5 cm] in length) in early spring (April-May) before leaves emerge. They have tubular corollas, ending in 5 unequal lobes. Flower buds are hairy and linear, becoming round.
Fruit
Fruits (1-2 in. [2.5-5.1 cm] long, 1-1.5 in. [2.5-3.8 cm] wide) are egg-shaped capsules, divided into 4 inner compartments that contain the seeds. Fruits are light green in the summer, becoming dark brown in the winter, and persist in clusters on the tree until the following spring. The capsules split in half during late winter to release up to 2000 tiny winged, wind-borne seeds 0.08-0.12 in. (2-3 mm).
Ecological Threat
Paulownia tomentosa is an aggressive tree that invades disturbed natural areas including forests, roadsides, and stream banks. It is native to China and was first introduced into the United States as an ornamental in 1840.

Management/Monitoring

Paulownia tomentosa can be controlled most effectively using an integrated management approach. Cutting or girdling trees with power or manual saws are effective at preventing seed production, but repeated cutting or a herbicide treatment is necessary following cutting since Paulownia readily resprouts.

Hand pulling

Young seedlings of Paulownia can be successfully controlled by manual removal. Pulling is easiest following a rain event, as the soil becomes loose. It is important to remove all root fragments as Paulownia can resprout from root fragments.

Cutting and Girdling

Cutting of Paulownia trees is most effective at the onset of flowering. Cutting at ground-level can prevent seed production for that year, but cutting alone must be repeated for several years to successfully kill the tree. Girdling results in top-kill of that stem, but may also induce increased resprouts. Cutting and girdling followed immediately by a herbicide application (cut-stump, hack-andsquirt) has good rates of efficacy.

Chemical Control

Paulownia can successfully be controlled by herbicides. The most common herbicides used to control Paulownia include glyphosate (tradenames RoundUp®, Rodeo®) and triclopyr (Garlon 3A® or Garlon 4®).

Foliar Spray

Paulownia seedlings can be controlled by using a foliar spray of either glyphosate (2% solution with 0.5% nonionic surfactant) or triclopyr (2% solution with 0.5% nonionic surfactant). These spray herbicides should be applied directly to the leaves and sprayed-to-wet.

Cut-Stump

Following cutting of the trees at ground-level, glyphosate (25% solution) or triclopyr (50% solution) should be directly applied to the stump. The cut-stump method can be used at all times of the year, as long as the ground is not frozen.

Girdling or Hack-and-Squirt

Immediately following girdling (approximately 15 cm above the ground and the cut should be well into or below the cambium layer) or hacking, directly apply glyphosate (25% solution) or triclopyr (50% solution) into the cut area.

Basal Bark

Apply a mixture of 25% triclopyr and 75% horticultural oil to the basal parts of the tree to a height of 30-38 cm (12-15 in) from the ground. Thorough wetting is necessary for good control, and spray until run-off is noticeable at the ground line. Basal bark applications should not be applied when the ground is frozen.

Resources

Information sources

Bibliography

  • Johnson, K. 1996. Invasive Plants: Weeds of the Global Garden: Paulownia tomentosa. Brooklyn Botanic Garden, Brooklyn.
  • Remaley, T. 1998. Plant Conservation Alliance Fact Sheet: Princess Tree.http://www.nps.gov/plants/alien/fact.htm. Accessed November 25, 2002.
  • SE-EPPC. 2001. Weed Fact Sheets: Princess Tree. Southeast Exotic Pest Plant Council. http://www.se-eppc.org/doc.cfm?id=506. Accessed November 25, 2002.

Source Document

Weed Notes: Paulownia tomentosa; Mandy Tu, 2002.


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