Sylvester Palm — Sebastian, Florida

A Sylvester palm can grow well in a sunny, well-drained Sebastian yard, but in Indian River County it is a known host of lethal bronzing and lethal yellowing, so planting one is a disease bet rather than a cold or soil bet.

The Sylvester palm planted in Sebastian is Phoenix sylvestris, known by the common names Sylvester, wild date, silver date or sugar date palm. UF/IFAS FR308 describes it as native to India and southern portions of Pakistan, slow growing, and able to reach heights of up to 50 feet, and growing well in areas of the United States where temperatures do not fall below 15°F. The UF/IFAS Central Florida selection table in EP020 gives a more typical landscape size of 40 x 25 ft and a USDA zone of 9a.

Invasiveness is not the concern. The UF/IFAS Assessment of Non-Native Plants rates Phoenix sylvestris a Low Invasion Risk in the Central, North and South zones, based on a 2024 predictive assessment. That leaves Sebastian homeowners weighing three local factors: disease pressure from two phytoplasmas already recorded in Indian River County, moderate tolerance of lagoon salt spray, and the city rule that palms may supply only part of a lot's required trees.

Lethal bronzing kills Sylvester palms, and a palm showing symptoms cannot be saved; UF/IFAS lists the wild date palm as a host and Indian River County, which includes Sebastian, among counties with confirmed cases.

The Sylvester was in the disease story from the start. UF/IFAS PP163 reports that the phytoplasma was isolated in late 2006 in the Tampa area from edible date palm, wild date palm (Phoenix sylvestris), Canary Island date palm and queen palm. The same publication's county table includes Indian River with neighboring Brevard and St. Lucie. A Sebastian Highlands street lined with Phoenix palms therefore sits in a county with confirmed cases.

Female Sylvesters give an early warning that other palms do not. PP163 states that if fruit is present, the first symptom is generally premature fruit drop, and that flower stalks without fruit turn necrotic. Leaf discoloration then climbs from the oldest fronds, and collapse of the spear leaf means the bud has died. The latent period appears to be about four to five months, and symptom development to spear collapse about two to three months. A Sebastian palm that suddenly sheds its orange date clusters is a reason to request a test before the lower leaves discolor.

Removal is the rule once a palm tests positive. PP163 directs that infected palms be removed immediately and that healthy palms nearby be tested and injected with oxytetracycline HCl every three to four months for at least two years. For a Sebastian yard with several Phoenix palms, that is a recurring treatment commitment for every neighbor tree worth saving.

Lethal yellowing is the second risk. UF/IFAS PP146 places Phoenix sylvestris on its table of palms susceptible to lethal yellowing and records that the disease was observed in Indian River County in 2012. FR308 itself advises avoiding wild date palm where lethal yellowing is known to be present.

A Sylvester palm fits an open, sunny spot on a well-drained Sebastian lot with room for leaves up to 10 feet long and spiny stems, set back from walks and away from the lagoon spray line on Indian River Drive.

FR308 describes pinnate blue-green leaves that can grow to 10 feet in length on a 3-foot petiole armed with spines, and a dense, round canopy that gives light shade. Those spines are the reason a Sylvester belongs at the center of a front lawn in the Sebastian Highlands rather than beside a driveway or a pool cage.

Soil suits the species better than many palms. FR308 says the wild date palm shows the best growth in direct sunlight, is drought tolerant and prefers well-drained sandy soils, while growing better when regularly watered. EP020 adds a caution for low ground: avoid sites with very high water tables unless the site can be built up with a sand berm. Swale-side and retention-pond lots in Sebastian that hold water after summer storms are the places where that berm matters.

Salt is the waterfront limit. EP020 rates the wild date palm's salt spray tolerance as moderate, below the high rating it gives coastal species, and notes that near the seashore only a few species tolerate salt spray, with fewer still tolerating brackish water on their roots. A lot facing the Indian River Lagoon east of US 1 is a harder site for a Sylvester than an inland lot off CR 512.

Sex also matters for yard care in Sebastian. FR308 notes that each tree is either male or female, and that the 1 inch oblong fruits hang in orange clusters that turn dark red to purple at maturity, which means fruit drop on patios under female palms.

City of Sebastian rules let a Sylvester palm count toward a lot's required trees only within a 35% cap for palms and only with 6 feet of clear wood, and they never treat it as a specimen tree.

The City of Sebastian tree ordinance brochure ties the number of required trees to lot size: 5 trees for 0 to 9,999 square feet and 7 trees for 10,000 to 15,999 square feet, and it notes that a quarter acre is 10,890 square feet. If palms are used, they shall make up no more than 35% of the total tree requirement and need a minimum of 6 feet of clear wood from grade to the first frond. Palm trees are credited only on a one-for-one basis, while larger existing trees may be credited as more than one tree.

The arithmetic for a quarter-acre Sebastian lot is short: 7 required trees x 35% = 2.45, so at most two of the seven can be palms, whether Sylvester, queen or sabal. A young Sylvester sold with little clear trunk will not count toward that requirement until it reaches 6 feet of clear wood.

Protection status differs from the native sabal. The brochure defines specimen trees as excluding all palm trees except sabal palms with a clear trunk of 6 feet or greater, so a mature Sylvester is never a specimen tree in Sebastian. The city's Natural Resources Board short list of native canopy trees on page 2 of the brochure names the cabbage palm, not any date palm. Where a removal permit applies, the brochure lists the cost as $25, says permits can be obtained online or in person at City Hall, and asks owners to call (772) 589-5537 after the permitted tree is removed to arrange a final inspection so the permit can be closed.

Inside Sebastian city limits, nitrogen and phosphorus fertilizer cannot go on a Sylvester palm from June 1 through September 30, so nitrogen and phosphorus feeding falls in the other eight months under section 50-5 of the city code.

The City of Sebastian fertilizer ordinance defines the prohibited application period as June 1 through September 30, plus any time a flood, tropical storm or hurricane watch or warning covers part of the City of Sebastian. It bars fertilizer within ten feet of any pond, canal or wetland or from the top of a seawall, and it allows phosphorus only when a soil or plant tissue deficiency is verified. Nitrogen applied within the city must be at least 50 percent slow release. The Indian River County fertilizer ordinance is a separate law that applies in the unincorporated areas of the county, outside Sebastian's limits.

UF/IFAS palm research fits that calendar. UF/IFAS EP261 states it is essential that 100% of the nitrogen, potassium and magnesium in a palm fertilizer be in slow release form, and reports that an 8N-0P-12K+4Mg blend was as effective as the traditional 8-2-12 formula. It also reports that palms fed that blend in February, May and November, with an August application of a controlled release palm fertilizer containing no nitrogen or phosphorus, did as well as palms fed the full blend four times. For a Sebastian Sylvester, that schedule respects the city's summer blackout while still feeding the palm through the rainy season.

The Indian River County Master Gardener plant clinic meets in Sebastian at the North Indian River County Library, 1001 Sebastian Blvd. (CR 512), on Wednesdays from 10 a.m. to noon.

The Indian River County Master Gardener Program lists a second clinic at the Extension office, 7961 58th Avenue in Vero Beach, Monday through Friday from 9 a.m. to noon and 1 to 4 p.m., with a phone line at (772) 226-4324. Its volunteers diagnose plant problems, identify common insects and perform soil pH tests. A Sebastian owner bringing photos of dropped fruit, discolored lower leaves or a collapsed spear leaf gives the clinic the lethal bronzing symptoms that PP163 describes.

For Sebastian lots where a native fits better than a Phoenix palm, sabal palms and canopy trees appear under trees and shrubs on Digital Towns Market. Digital Towns Market is our marketplace.

Last verified: October 12, 2026, on the City of Sebastian website.