Pluchea carolinensis


Michael's Opinion

A widely distributed tropical/subtropical shrub that attracts multiple pollinators, p. carolinensis has several traditional medicinal and cultural uses. It has prolific wind dispersed achenes and is considered invasive outside its natural range. Easy to cultivate and hard to kill, caution should be used when considering this plant for your garden.

Botanical Information

FamilyAsteraceae
GenusPluchea
Speciescarolinensis
CategoryWoody
TypeShrub (deciduous)
OriginNative to: Aruba, Bahamas, Belize, Bermuda, Cayman Is., Colombia, Costa Rica, Cuba, Dominican Republic, Ecuador, El Salvador, Guatemala, Guyana, Haiti, Honduras, Jamaica, Leeward Is., Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Northwest, Mexico Southeast, Mexico Southwest, Netherlands Antilles, Nicaragua, Panamá, Peru, Puerto Rico, Suriname, Trinidad-Tobago, Venezuela, Venezuelan Antilles, Windward Is.
Ethnobotanical Uses
Disclaimer
One of the many common names for Pluchea carolinensis is "Cure-for-all" and rightly so. It is considered to be an antiseptic, anti-inflammatory as well as anticoagulant and is used in an array of treatments from sore throats, and headaches, to high blood pressure, stomach ailments, and flatulence, all over the Caribbean, Southern Florida and beyond.

Details

USDA Hardiness Zone9b - 11
USDA Hardiness Ref.
Canadian Hardiness ZoneGrow under glass
Canada Hardiness Ref.
RHS Hardiness ZoneH3 - H1c
RHS Hardiness Ref.
Temperature (°C)(-4) - 10
Temperature (°F)25 - 50
Height0.1 - 0.5 m
Spread1 m
GrowthFast
Flowering PeriodFebruary, March, April, May, June

Description and Growing Information

General DescriptionA small perennial shrub that is usually found in disturbed places. It’s many branches are tomentos, and it’s leaves are long and velvety. It attracts both bees and butterflies with it’s pinkish-white, flat topped inflorescences.
ID Characteristic“When rubbed, the leaves have an unpleasant, rather turpentine-like odor, and they can make your hands feel a bit sticky. It has pinkish-white to lavender inflorescences with brownish-white pappus and it’s stems are glandular tomentos.
ShapeAn erect shrub. Older plants are held upright by flexible lateral roots and it can be sparsely branched.
Landscape It is a successional nurse crop and can be used for re-vegetation, dune stabilization, and for erosion control. It is considered invasive outside of its natural range, competing with native plants for space and resources.
PropagationP. carolinensis uses wind based dispersal and requires bare, wet soil to germinate. It may be helpful to scarify the ground prior to propagation.
CultivationAs an early successional species it is shade intolerant and commonly thrives in disturbed habitats. Tolerant of salt and compaction, it grows in areas with at least 1000 mm of annual rainfall or where there is sufficient groundwater levels and requires bare, wet soil in which to germinate.
Notable SpecimensPluchea carolinensis is considered a weed in several places including Hawaii and Taiwan. It rears it’s unwanted panicles in many locations across the state of Florida, United States of America, including in Big Pine Key, Miami Beach, West Palm Beach, and Seminole.
HabitatIt is found in subtropical/tropical moist lowlands as well as naturally and human impacted disturbed places such as: landslides, burned areas, construction sights, abandoned fields, dry coastal areas, barren mud/stone slopes, eroded sites, roadsides and hammock borders. It grows from around sea level to an elevation of 1000 m.
Bark/Stem DescriptionThe basal stem can be up to 6 cm in diameter. P. carolinensis stems are glandular tomentos and moderately soft and brittle.
Leaf DescriptionThe leaves are green and almost hairless to finely haired above, paler dull green and velvety below, smooth-edged or very finely toothed, petiolate, and variably elliptic in shape. They are 6-15 cm long, 2-6 cm wide, petioles 1-2.5 cm long.
Flower DescriptionIt has flat topped inflorescences of pinkish-white that age to a rusty brown with it’s individual blooms measuring under 2.54 cm. The individual blooms have tardily falling pappi made up of 10-12 capillary bristles that are a dull brownish-white.
Fruit DescriptionIt has achenes that are brownish-black, measuring 0.8 mm long. They are scarcely grooved and are a sparsely whitish pubescent. The achenes are vestigial as a small, cartilaginous ring.

Photographs