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Summary
Duration	Perennial
Growth Habit	Tree, Shrub
U.S. Nativity	Native to U.S.
Federal T/E Status
National Wetland Indicator	FAC, FACW
Morphology/Physiology
Active Growth Period	Spring, Summer, Fall
After Harvest Regrowth Rate
Bloat	None
C:N Ratio	High
Coppice Potential	No
Fall Conspicuous	Yes
Fire Resistant	No
Flower Color	White
Flower Conspicuous	Yes
Foliage Color	Dark Green
Foliage Porosity Summer	Dense
Foliage Porosity Winter	Moderate
Foliage Texture	Coarse
Fruit/Seed Color	White
Fruit/Seed Conspicuous	No
Growth Form	Multiple Stem
Growth Rate	Moderate
Height at 20 Years, Maximum (feet)	10
Height, Mature (feet)	10
Known Allelopath	No
Leaf Retention	No
Lifespan	Moderate
Low Growing Grass	No
Nitrogen Fixation
Resprout Ability	Yes
Shape and Orientation	Erect
Toxicity	None
Growth Requirements
Adapted to Coarse Textured Soils	Yes
Adapted to Fine Textured Soils	Yes
Adapted to Medium Textured Soils	Yes
Anaerobic Tolerance	High
CaCO3 Tolerance	Low
Cold Stratification Required	No
Drought Tolerance	Low
Fertility Requirement	Low
Fire Tolerance	Medium
Frost Free Days, Minimum	180
Hedge Tolerance	Low
Moisture Use	High
pH, Minimum	5.5
pH, Maximum	7.8
Planting Density per Acre, Minimum	700
Planting Density per Acre, Maximum	2700
Precipitation, Minimum	36
Precipitation, Maximum	60
Root Depth, Minimum (inches)	20
Salinity Tolerance	Medium
Shade Tolerance	Intermediate
Temperature, Minimum (°F)	-3
Reproduction
Bloom Period	Late Summer
Commercial Availability	Routinely Available
Fruit/Seed Abundance	High
Fruit/Seed Period Begin	Fall
Fruit/Seed Period End	Fall
Fruit/Seed Persistence	Yes
Propagated by Bare Root	Yes
Propagated by Bulb	No
Propagated by Container	Yes
Propagated by Corm	No
Propagated by Cuttings	No
Propagated by Seed	Yes
Propagated by Sod	No
Propagated by Sprigs	No
Propagated by Tubers	No
Seed per Pound	85000
Seed Spread Rate	Slow
Seedling Vigor	Low
Small Grain	No
Vegetative Spread Rate	None
Suitability/Use
Berry/Nut/Seed Product	No
Christmas Tree Product	No
Fodder Product	No
Fuelwood Product	None
Lumber Product	No
Naval Store Product	No
Nursery Stock Product	No
Palatable Browse Animal
Palatable Graze Animal
Palatable Human	No
Post Product	No
Protein Potential
Pulpwood Product	No
Veneer Product	No

 

Kingdom  Plantae -- Plants

Subkingdom  Tracheobionta -- Vascular plants

Superdivision  Spermatophyta -- Seed plants

Division  Magnoliophyta -- Flowering plants

Class  Magnoliopsida -- Dicotyledons

Subclass  Asteridae

Order  Asterales

Family  Asteraceae -- Aster family

Genus  Baccharis L. -- baccharis P

Species  Baccharis halimifolia L. -- eastern baccharis P

 

Alternate common names

Eastern baccharis, silverling, sea myrtle, manglier, consumption weed, saltbush

 

Uses

The native groundsel tree is recommended as a garden shrub or hedge in Florida because of its hardiness, freedom from disease, fall flowering, and resistance to salt spray.  The female plants, in particular, with their densely silver-green aspect, are beautiful when few other plants are flowering.  Plants can be trained to a single trunk – tree-like and up to 10 feet tall.  It is a useful shrub for reclaiming moist or wet sites, including retention areas and drainage ponds.  

 

Although it apparently has little or no value as a good food source for game animals (“wildlife”), groundsel tree provides cover and nesting habitat for various species of birds.  Bees and small butterflies use the abundant nectar from the male flowers, which in turn attract songbirds to forage on the insects. 

 

Status

Please consult the PLANTS Web site and your State Department of Natural Resources for this plant’s current status, such as, state noxious status and wetland indicator values.

 

Description

General: Sunflower Family (Asteraceae).  Deciduous shrubs 1-2(-6) m tall, sometimes single-stemmed from the base and tree-like.  Leaves: deciduous, obovate to elliptic or narrowly elliptic-oblanceolate, 3-nerved, 2-6 cm long, smooth-margined or with 1 tooth or 1-3 pairs of coarse teeth on the upper margins, the surfaces slightly resinous, usually with small dots.  Florets closely clustered in heads surrounded by involucral bracts, the heads borne in tight aggregations; heads of two sexes, each produced on a separate plant (the species dioecious) –– the staminate heads (pollen-producing, with sterile ovaries) with only tubular, 5-lobed corollas; the pistillate heads (with fertile ovaries) with only thread-like corollas.  Fruits (“cypselae” or achenes) are 1-seeded, nearly cylindric, 1.3-1.8 mm long, topped by a ring of numerous, slender, flexible, silvery-white bristles (the “pappus”), which elongates at achene maturity to 10-12 mm long, much longer than the involucre.  The small fruits are shed with the pappus, a wind-catcher that enables fruit dispersal over a wide area.  In a steady wind of about 17 km/hour, drift of seeds from a shrub two meters in height has been recorded up to 140 meters.  The common name “silverling” alludes to the silvery aspect of pistillate plants in the fall, when the pappus of each maturing fruit elongates and protrudes from the head. 

 

Variation within the species: Plants of this species from the West Indies have been called Baccharis halimifolia var. angustior DC., but there appears to be little justification for their formal recognition.  Baccharis halimifolia closely resembles the Mexican species Baccharis heterophylla Kunth.  Where both occur in Veracruz, Mexico, B. halimifolia can be recognized by its habitats along the coast or coastal plain, its more gradate, blunt-tipped involucral bracts, and its longer pappus.  Plants from central Nuevo León, Mexico, have narrower leaves than typical for B. halimifolia, but in most respects they are more similar to it than to B. heterophylla.  Baccharis halimifolia hybridizes with B. neglecta Britt. where the two meet in east Texas. 

 

Groundsel tree is a member of the sunflower family, but the sunflower-like nature of the heads is not evident without close inspection.  Baccharis halimifolia is the species upon which the concept of the genus Baccharis is based (the type species). 

 

Distribution

For current distribution, please consult the Plant Profile page for this species on the PLANTS Web site.  Groundsel tree occurs in all states bordering the Atlantic Ocean and Gulf of Mexico, plus the Caribbean and into northeastern Mexico as far south as Veracruz and San Luis Potosí. 

 

Establishment

Adaptation: Groundsel tree grows on beaches, marshes and hammocks near the shore, and various more inland sites, including ditches, old fields, and roadsides.  Flowering in the United States occurs mainly in August-December. 

General: Plants of groundsel tree as young as 3 years may produce viable seed.  Because it is dioecious, male and female plants are necessary for seed production.  There is no dormancy requirement for germination.  Other reasons for its colonizing success are prolific seed production and high seed germination percentage, long-range seed dispersal, shade tolerant seed production, wide adaptability to soil nutrients and salinity, survival in extreme wet soil conditions, and ability to resprout after fire.  

 

Groundsel tree can be cultivated in a sunny location.  It does not tolerate heavy clay soils but can be successfully grown in nutrient-poor soil.  Most native coastal plain habitats are sandy.  In its resistance to salt spray, it is useful in coastal situations.  It is a fast-growing plant and will quickly regrow, even if cut back to the base. 

 

Management

Probably from initial introductions of groundsel tree as an ornamental into western Europe (France, Spain, and Italy) and Queensland, Australia, it has become an invasive weed, rapidly occupying open sites and encroaching into grassland and parkland.  Because animals apparently find it unpalatable (the leaves and flowers contain a cardioactive glycoside), it is common to see the species growing in abundance in pastureland.  Groundsel tree is toxic to livestock, causing staggering, trembling, convulsions, diarrhea, and other gastrointestinal symptoms, but this feature is less significant than the displacement of other vegetation through its rapid colonization.  This native species has been regarded as an “infestation” on overgrazed rangeland in the southern United States. 

 

Various native species of beetles and moths are known to feed on leaves and buds of Baccharis.  Larvae and adults of several of these are capable of defoliating plants of groundsel tree.  North American gall-forming midges, seed-feeding bugs, and stem borers also cause damage and some have been introduced into Australia as agents of biological control for Baccharis halimifolia. 

 

Cultivars, Improved and Selected Materials (and area of origin)

These plant materials are somewhat available from commercial sources.  Contact your local Natural Resources Conservation Service (formerly Soil Conservation Service) office for more information.  Look in the phone book under ”United States Government”.  The Natural Resources Conservation Service will be listed under the subheading “Department of Agriculture.”

 

References

Boldt, P.E. 1989.  Baccharis, (Asteraceae), a review of its taxonomy, phytochemistry, ecology, economic status, natural enemies and the potential for its biological control in the United States.  MP 1674, Texas Agric. Expt. Station, Texas A&M Univ., College Station, Texas.

 

Cronquist, A. 1980.  Vascular Flora of the Southeastern United States.  Vol. 1.  Asteraceae.  Univ. of North Carolina Press, Chapel Hill, North Carolina.

 

Nesom, G.L. 1990.  Infrageneric taxonomy of North and Central American Baccharis (Asteraceae: Astereae).  Phytologia 69:40–46.

 

Zanowiak, D.J. 1991.  An analysis of systematic and phyletic relationships within the Baccharidinae (Asteraceae: Astereae).  Ph.D. Dissertation, Texas A&M University, College Station, Texas.

 

Prepared By

Guy Nesom

Formerly BONAP, North Carolina Botanical Garden, University of North Carolina, Chapel Hill, North Carolina

 

Species Coordinator

Lincoln Moore

USDA, NRCS, National Plant Data Center, Baton Rouge, Louisiana

 

Edited: 17jan01 jsp;10feb03ahv; 31may06 jsp

 

For more information about this and other plants, please contact your local NRCS field office or Conservation District, and visit the PLANTS Web site<https://plants.usda.gov> or the Plant Materials Program Web site <https://Plant-Materials.nrcs.usda.gov>

 

 

 

Attribution:  U.S. Department of Agriculture