While they are all members of the Arecaceae family, palmettos (Sabal adans.) and palms are not the same plants. Only a few palm trees such as the Everglades palm (Acoelorraphe wrightii), Florida silver palm (Coccothrinax argentata) and desert palm (Washingtonia filifera) are native to the United States. Several palmetto species grow wild in a band from Texas and Oklahoma eastward to the Carolinas, Georgia and Florida. Palms and palmettos generally grow best in tropical and subtropical climates in U.S. Department of Agriculture hardiness zones 9 through 11.
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The main difference between palmettos and palms is size. Palms can top 80 feet tall, while the largest palmetto grows only about 30 feet tall. Both palm trees and palmettos are monocots, which means they do not produce trunks or main stems in layers the way oaks, pines and other woody trees do. Palm trees have no bark. Palm trees grow their stems underground for the first few years and the plant remains quite short. When the tree finally sends its stem upward, the real show begins, because palms can add as much as a foot of height every year. While a pygmy date palm (Phoenix roebelenii) is only about 12 feet tall, the native royal palm (Roystonea spp.) can get up to 80 feet tall. Cabbage palm (Sabal palmetto) is one species of palmetto that grows upright to about 30 feet tall. Palm tree trunks grow vertically, while the main stem of most palmetto species generally stay on or just below the ground and grow horizontally. Dwarf palmetto (Sabal minor) grows about 4 feet tall while saw palmetto (Serenoa repens) is 5 to 10 feet tall. Scrub palmetto (Sabal etonia) is only about 4 feet tall at maturity. Cabbage palm (Sabal palmetto) is a tall species of palmetto that grows upright to about 30 feet.
Palms produce large fronds in an alternate or spiral pattern. The leaves have parallel veins and grow 18 to 36 inches long. Most, but not all, palmettos have thick, flattened leaves in a star shape that may exceed 36 inches in length. The saw palmetto has lancelike, stiff leaves in a star-shaped pattern. The leaves have small serrations, which gives the plant its common name.
Desert, royal and queen palms have showy white flowers. Royal palm's highly aromatic flowers are yellow, while the others can be white, cream or grey. Scrub palmetto produces small, uninteresting white flowers, but saw palmetto proudly displays its fragrant, yellowish white flowers on stalks up to 3 feet long. Dwarf palmetto is more demure, sending its flower stalks out to just beyond the tips of the foliage to display its fragrant white flowers.
Queen palm produces bright orange, ornamental dates. The large, heavy fruit of coconut palms falls from the tree when ripe and can damage property or injure anyone standing under the tree when they fall. Palmettos produce small, berrylike fruit less than an inch long that birds find delicious.
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- Lady Bird Johnson Wildflower Center: Everglades Palm
- Lady Bird Johnson Wildflower Center: Florida Silver Palm
- Lady Bird Johnson Wildflower Center: Desert Palm
- University of Florida; Phoenix Roebelenii: Pygmy Date Palm; Edward F. Gilman, et al.; November 1993
- University of Florida; Roystonea spp.: Royal Palm; Edward F. Gilman, et al.; November 1993
- University of Florida; Sabal Palmetto: Cabbage Palm; Edward F. Gilman, et al.; November 1993
- University of Florida; Sabal Minor Bluestem Palmetto, Dwarf Palmetto; Edward F. Gilman; October 1999
- University of Florida; Serenoa Repens: Saw Palmetto; Edward F. Gilman; October 1999
- University of Florida; Sabal Etonia Scrub Palmetto; Edward F. Gilman; October 1999
- Clemson University; Palms & Cycads; Nancy Doubrava, et al.; May 1999
- The U.S. National Arboretum; USDA Plant Hardiness Zones Map; Henry M. Cathey; January 1990