Scrub Habitat in Sebastian, Florida

Scrub in Sebastian is a low, fire-shaped thicket of evergreen scrub oaks, Florida rosemary and sometimes sand pine growing on deep, dry, nutrient-poor sand, now kept mostly on Indian River County preserves in the Sebastian Highlands and at Wabasso.

The UF/IFAS Florida Land Steward program defines scrub as a community on well-drained sandy soils dominated by a layer of evergreen oaks, Florida rosemary or both, with or without a pine overstory. It lists six kinds: sand pine scrub, oak scrub, scrubby flatwoods, rosemary scrub, coastal scrub and slash pine scrub. Three of those names, oak scrub, sand pine scrub and scrubby flatwoods, appear in Indian River County's descriptions of the preserves around Sebastian.

The ground explains the plants. Land Steward says practically all scrub soils are entisols derived from quartz sand, excessively well drained and nearly free of silt, clay and organic matter, so they hold little water or fertility. A UF/IFAS Extension guide, Common Woody Plants of Florida Scrub, adds that scrub has patches of open, bare sand and plants with traits for drought, such as the curled, waxy leaves of sand live oak. WQCS reported in October 2025 that scrub in the Sebastian Highlands had been threatened by development as the area grew.

The community is rare because people built on the same high, dry ground. Indian River County says each natural community on the Wabasso Scrub Conservation Area has been identified at the local and state level as threatened or significantly impacted by historic development along the Atlantic Coastal Ridge, and that the sand pine scrub there, about 40 percent of the tract, is classified as imperiled both globally and statewide by the Florida Natural Areas Inventory and the Florida Department of Environmental Protection.

The core plants of the scrub around Sebastian are four scrub oaks, Florida rosemary, sand pine, rusty lyonia and two palmettos, the woody species UF/IFAS lists for Florida scrub.

Oaks carry the habitat. The UF/IFAS scrub guide separates the look-alikes by the leaf: myrtle oak's leaf is less than twice as long as it is wide and usually obovate, while scrub oak's leaf is twice as long as wide and is held vertically on the plant because of twisted petioles. Sand live oak leaves have margins rolled so strongly that the leaf resembles a boat. All four oaks spread by underground runners into thickets, the thickets behind the oak scrub that Indian River County describes on the Schumann Drive tract in Sebastian.

Florida rosemary marks the poorest sand. UF/IFAS Extension describes an evergreen shrub up to 6 feet tall with leaves so strongly revolute they appear needle-like, which smell like rosemary when crushed, and with male and female flowers on separate plants. Its fruit feeds wildlife but is not produced until plants are at least 12 years old. Land Steward says the least productive scrub soils carry rosemary scrub, a shrub layer of Florida rosemary under widely scattered sand pine, while more productive scrub sand carries the oak scrub and sand pine scrub that Indian River County lists on the Wabasso and North Sebastian tracts.

Sand pine is the tree that names sand pine scrub. Land Steward calls it the primary diagnostic element of Florida scrub and notes that the peninsular Ocala variety, the form found on the Florida peninsula, is predominantly serotinous, keeping its cones closed. Rare plants ride along: the FWC birding trail page for Wabasso Scrub names Curtiss' milkweed among the scrub-dependent species on that tract.

Sebastian scrub needs fire, or a substitute such as roller chopping, every few decades because burning resets the oaks to low resprouts and reopens bare sand, while long fire exclusion turns scrub into shady xeric hammock.

The UF/IFAS scrub guide gives fire intervals that typically range from 5 to 30 years, depending on soil, drainage and scrub type, the range that applies to the oak scrub of the Sebastian Highlands preserves. Fire top-kills woody shrubs such as lyonias and the scrub oaks, which re-sprout from underground root systems, while sand pine and Florida rosemary are killed outright and come back from seed. Burning also clears litter and opens the bare sand where many rare scrub plants grow. The guide warns that without fire, plant diversity drops as scrub converts to xeric hammock.

The interval sets which kind of scrub grows on a tract such as Wabasso. Land Steward says scrub is maintained by high-intensity fires that come infrequently, perhaps once every 10 to 100 years. More frequent fires support oak scrub and scrubby flatwoods, longer gaps keep sand pine scrub, and an interval of more than 100 years may lead to xeric hardwood hammock. Florida rosemary fits the slow end: UF/IFAS places it in communities with fire return intervals of 20 to 40 years, and notes that fire and storm surge kill the plants but seeds germinate readily afterward. Coastal scrub is the one exception Land Steward names, shaped by storms rather than fire.

Around Sebastian, Indian River County uses both fire and machines on its scrub tracts. WQCS reported in October 2025 that the Sebastian scrub-jay plan, approved in 2000, called for restoring scrub through burning and roller-chopping. On the Sebastian Harbor Preserve off Englar Drive, the county started both treatments in its scrubby and mesic flatwoods in 2007, and on the Schumann Drive tract it has cut firebreaks along the trails.

Scrub around Sebastian survives on four Indian River County tracts, from Schumann Drive and Englar Drive in the Sebastian Highlands north to Main Street and Wabasso, and on the scrub ridges of St. Sebastian River Preserve State Park.

Inside the city, the smallest piece is the most purely scrub. The county page says the Sebastian Scrub Conservation Area is dominated by oak scrub and scrubby flatwoods, and that it links northwest through the Sebastian Stormwater Park to the Sebastian Harbor Preserve, where the county lists scrubby and mesic flatwoods as the dominant communities. Together they form a green strip through the Sebastian Highlands.

The North Sebastian Conservation Area was bought by the county between 1996 and 1999 with the stated purpose of preserving and restoring scrub and wetland habitats, and its plant cover runs from mesic and hydric flatwoods through oak scrub and sand pine scrub to marshes. The Wabasso tract, by county figures, holds 53 acres of sand pine and scrub oak with scrubby flatwoods out of 111. West of town, Florida State Parks counts scrub ridges among the 23 distinct natural communities of St. Sebastian River Preserve State Park, home to over 70 listed species.

More scrub may yet be protected. In a March 2026 WQCS report on the first purchases under Indian River County's $50 million environmental bond, Parks, Recreation and Conservation Director Beth Powell named xeric scrub among the imperiled habitats the program could protect, and said about 87 properties had been nominated.

Besides the Florida scrub-jay, Sebastian scrub shelters the gopher tortoise, gopher frog and Florida scrub lizard, plus rare plants such as Curtiss' milkweed, according to the FWC birding trail and Indian River County.

The Great Florida Birding and Wildlife Trail calls Wabasso Scrub a little-known conservation area that protects scrub-dependent species including the Florida scrub-jay, Florida scrub lizard, gopher tortoise, gopher frog and Curtiss' milkweed. Its 1-mile trail from West Wabasso Park passes through sand pine scrub, oak scrub and a small stand of flatwoods, a public route through the community near Sebastian.

The gopher tortoise is the engineer. Indian River County says a tortoise burrow can give refuge to over 360 other species, and that the Wabasso tract has served as a recipient site for relocated gopher tortoises. The Indian River Land Trust funded a 2007 study in the North Sebastian Conservation Area of tortoise numbers, the preserve's carrying capacity and the potential for taking in tortoises displaced by development. The Sebastian Harbor Preserve also lists the gopher tortoise among its protected species.

Land Steward's wider list for Florida scrub includes the Florida mouse, sand skink, Bachman's sparrow, eastern towhee and black racer. Not every one is documented on the Sebastian tracts, but the list shows why Indian River County treats its scrub preserves as habitat for many species rather than for one bird.