In the Shadow of the Pines: A Conversation with Dr. Timothy Martin

When people think of Florida, pine trees are rarely the first thing that comes to mind. Beaches, wetlands, palms—yes. Pine savannas, not so much. And yet, for much of Florida’s history, pine‑dominated landscapes defined the uplands of this state.

In this month’s episode of Roots in the Sunshine, I sat down with Dr. Timothy Martin, professor of tree physiology at UF/IFAS, to explore why pine trees matter ecologically, historically, and in the landscapes where many of us live today.

What Makes a Pine a Pine?

We began with the fundamentals. Pines belong to an ancient group of plants known as gymnosperms, meaning they produce “naked seeds” not enclosed in fruit.

Their cones predate flowering plants by millions of years, making pines some of the oldest tree lineages still shaping modern forests.

That evolutionary history shows up in their physiology. Pines transport water through narrow, reinforced cells that provide both structural support and water movement. While less efficient than the wide vessels found in many broadleaf trees, this system is durable and well suited to stress‑prone environments. For a deeper dive into Florida species and pine biology, UF/IFAS provides an excellent overview in Common Pines of Florida.

Needles, Resin, and Life on Tough Sites

Pine needles are more than a visual identifier. Their narrow shape helps dissipate heat, while thick waxy coatings and sunken pores (stomata) reduce water loss. Resin serves as a defense against herbivores and needles live longer than most broad leaves.

This long leaf lifespan contributes to evergreen growth and nutrient efficiency. Pines often thrive in sandy, nutrient‑poor soils where other trees struggle, frequently relying on mycorrhizal fungi to extend their ability to access water and nutrients. These adaptations explain why pines are common in places unsuitable for agriculture and vital to Florida’s upland ecosystems.

Pine Savannas and a Fire‑Shaped Landscape

Much of the conversation focused on longleaf pine savannas, once the dominant ecosystem across the southeastern Coastal Plain. Early explorers like William Bartram described open forests with widely spaced pines and frequent, low‑intensity fires.

Fire was not a disturbance in these systems; it was a defining force. Indigenous peoples regularly used fire to manage landscapes, and lightning fires were common. Longleaf pine evolved alongside this reality.

Its famous grass stage, where seedlings resemble clumps of wiregrass for years, allows young trees to survive repeated fires while building deep root systems. When conditions are right, they grow rapidly upward, lifting their vulnerable growing point above the flame zone. This strategy keeps longleaf pine competitive while preventing other pines and hardwoods from establishing in frequently burned systems.

The result is an ecosystem where diversity is concentrated not in the canopy but on the ground. Hundreds of grasses, wildflowers, and shrubs support species such as gopher tortoises and indigo snakes.

From Legacy Forests to Pine Stands

Most of Florida’s original longleaf pine ecosystems were cleared by the early 1900s for agriculture, timber, and development. As abandoned fields regenerated, species like loblolly pine filled the gap, shaping the rise of silviculture in the Southeast.

Dr. Martin explained how decades of selective breeding, not genetic engineering, have produced plantation pines that grow faster and resist disease. These advances transformed timber production but have had limited influence on the urban nursery market, where pines are often an afterthought.

Pines in Urban Landscapes

Despite their ecological pedigree, pines are underused in residential and urban settings. They are frequently relegated to buffer areas or dismissed as problematic. Yet many concerns stem from mismatches between tree biology and site conditions.

Pines tend to cause fewer hardscape conflicts than surface‑rooting hardwoods, but they are less tolerant of heavily fertilized or irrigated landscapes. Excess nutrients can increase susceptibility to diseases such as pitch canker and fusiform rust. This mirrors themes explored in my earlier post, Whispering of the Pines, which examines how stress, storms, and secondary pests interact in urban pine decline.

As with all trees, placement matters. Pines can be highly appropriate in the right locations, particularly where soils are lean, inputs are minimal, and space allows for their mature size and wind behavior. See this publication by Duryea and Kampf on wind resistance and trees for Florida landscapes.

Learning from What Survives

As hurricanes become more intense, it is easy to focus on the trees we lose. Dr. Martin encouraged a broader view. Many trees survive extreme events, and those survivors tell us something about species selection, structure, and site compatibility.

Pines have persisted through fire, drought, storms, and centuries of land‑use change. They remain one of Florida’s strongest ecological legacies.

If you are willing to look past the shoreline and step into a pine savanna, you may find one of the most resilient and biologically rich landscapes in the state, quietly shaping Florida’s past and future.