Saltmarsh, Longleaf Ironwood, Swamp Oak

Casuarina glauca

Family: Casuarinaceae
Genus: Casuarina (kazh-yoo-ar-EYE-nuh) (Info)
Species: glauca (GLAW-kuh) (Info)



Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Unknown - Tell us

Water Requirements:

Unknown - Tell us

Where to Grow:

Unknown - Tell us


over 40 ft. (12 m)


Unknown - Tell us


USDA Zone 9a: to -6.6 C (20 F)

USDA Zone 9b: to -3.8 C (25 F)

USDA Zone 10a: to -1.1 C (30 F)

USDA Zone 10b: to 1.7 C (35 F)

USDA Zone 11: above 4.5 C (40 F)

Sun Exposure:

Full Sun

Sun to Partial Shade


Unknown - Tell us

Bloom Color:

Unknown - Tell us

Bloom Time:

Unknown - Tell us


This plant is fire-retardant

Other details:

May be a noxious weed or invasive

Soil pH requirements:

Unknown - Tell us

Patent Information:

Unknown - Tell us

Propagation Methods:

Unknown - Tell us

Seed Collecting:

Unknown - Tell us


This plant has been said to grow in the following regions:

Boca Raton, Florida

Brownsville, Texas

Gardeners' Notes:


On Mar 18, 2016, coriaceous from ROSLINDALE, MA wrote:

This is a Florida state noxious weed.

The Florida Exotic Pest Plant Council has listed this as a Category l invasive species.

Naturalized in Alabama and Florida (BONAP).


On Jan 28, 2005, melody from Benton, KY (Zone 7a) wrote:

Also known as the Brazilian Beefwood. It has been introduced into tropical Florida, where, as stated above, it is becoming a dangerous pest.

It is distinguished by having 12 to 17 scale leaves per jointed whorl.


On Jan 19, 2005, NativePlantFan9 from Boca Raton, FL (Zone 10a) wrote:

Suckering Australian Pine, Longleaf Ironwood, Saltmarsh Ironwood, Grey Sheoak or Swamp Sheoak (Casuarina glauca) is highly invasive in many or all habitats throughout much of central and southern Florida and the Keys, from zone 9a south through zone 11. It is found in many counties. It is just as invasive as C. equestifolia (Australian Pine, Beefwood, or Horsetail Tree), which is also extremely invasive in central and southern Florida and the Keys (also zones 9a through 11). This spp. is a suckering, spreading spp. with longer needles than C. equestifolia, but this spp. often may hybridize with C. equestfolia, blending characteristics of both spp. This spp. is highly invasive in disturbed sites, coastal sites, open sunny sites, areas with high salt, beaches, mangrove swamps, saline or alk... read more


On Jan 18, 2005, BROforest from Brownsville, TX (Zone 9b) wrote:

THIS DESCRIPTION refers to my Photo which is a Casuarina glauca-this and equisetifolia ( Australian Pine) are EQUALLY INVASIVE and to be avoided. Glauca has longer needles(branch scales). Since moving to the 'tropical tip of Texas' I've had these weeds growing at my house in Laguna Vista. I cannot find many plants that will tolerate growing beneath them and am constantly chopping them out of my lawn. They also seem to send out very fine hair-like dark brown rootlets that extend out at least 25' and seem to strangle any plant that these rootlets grow around. The plant actually seems to die of thirst and extreme watering seems to make the rootlets even thicker. Bougainvillea, Hibiscus, Ixora, Pinus Spp., Boxwood, various Ivys... don't grow but some Aloes, Agaves and an old sour orange ... read more


On Jul 8, 2004, punaheledp from Kailua, HI (Zone 11) wrote:

in Hawaii it is on the pest plant list. very similar to c.equisefolia