Sabal Palmetto - Cultivation and Uses

Cultivation and Uses

Sabal palmetto is a popular landscape plant known for its tolerance of salt spray and cold. Because of their relatively long establishment period and prevalence on ranchlands, few, if any are grown from seed in nurseries. Instead, established plants are dug in the wild with small rootballs since virtually all the severed roots die and must be replaced by new roots in the new location. Most leaves are removed at this time to reduce transpiration. It is the state tree of South Carolina and Florida. Most references rate the species as hardy to USDA hardiness zone 8a without protection, although with protection, proper siting, and care it can be grown in zone 7. Cabbage palms have good hurricane resistance, but are frequently overpruned for a variety of reasons.

The growing heart of the new fronds, also known as the terminal bud, gives the tree its "cabbage" name, since this is extracted as a food and tastes like other undifferentiated plant meristem tissue, such as the heart of a cabbage or artichoke. It is one of several palm species that is sometimes used to make heart of palm salad. Heart of palm was commonly eaten by Aboriginal Americans. However, extracting the heart will kill this species of palm, because the terminal bud is the only point from which the palm can grow and without this bud the palm will not be able to replace old leaves and will eventually die.

The cabbage palm is remarkably resistant to fire, floods, coastal conditions, cold, high winds and drought. Despite this, alarming causes of recent mortality include rising sea level (most noticed on the Big Bend Coast of Florida), and Texas phoenix palm decline (TPPD) a phytoplasma currently found on the west coast of Florida.

Sabal palmetto trunks appear in two different conditions, which can be confusing (see photo). When leaves die, the leaf bases typically persist for a while, creating a spiky, "basketweave" effect. These remnant leaf bases are called "bootjacks" or "boots", for short. The name stems from the "Y" shape that was reminiscent of devices used to aid individuals in removing boots. Transplanted palms are sometimes deliberately shorn of these bootjacks. Taller specimens are more likely to have lost their bootjacks and appear relatively smooth and columnar. The loss of bootjacks is a natural, if poorly understood, phenomenon as the palm does not create a leaf abscission zone so the loss of the leaf bases results from some other physical or biological process.