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Longleaf pine
Habit (mature) · Photo (c)2006 Derek Ramsey (Ram-Man) / Wikimedia Commons · CC BY-SA 2.5
Limited coverage

Longleaf pine

Pinus palustris
A long-lived, fire-dependent pine of the Southern Coastal Plain, once the dominant tree across tens of millions of acres of open, grassy pine savanna from Virginia to east Texas. It is named for its very long (8-18 inch) needles, which grow in bundles of three and give the tree a distinctive open, tufted look, and for its large 6-10 inch cones. Longleaf is famous for its multi-year "grass stage": for several years after germination a seedling looks like a clump of grass, putting energy into a deep taproot and a fire-resistant bud at ground level before it ever shoots upward. That makes it slow to establish but exceptionally storm-, drought-, and fire-tolerant once grown. This is a large restoration and landscape conifer, not a quick ornamental — plant it for the long term.
Review: Source-backed
Climate fit: narrow (27/100)
Structure
Focal point
Light
Full sun
Water
Moderate water
Mature size
720-1440" tall · 540" apart
Hardy in zones
7b-9b
cold to frosty winters
Native in Illinois
No
Grown as a restoration and landscape tree and historically one of the great American timber and naval-stores (turpentine and rosin) species, but it is not a human food crop.

Cold hardiness

Future
These values are location-based: this location's current hardiness is the baseline, and the 2050 value is a projected future climate for this same location.
Now
Zone 6b
USDA
Published baseline for this location from 1991-2020.
Source: USDA Plant Hardiness Zone Map 2023 (1991-2020 climatology) via ArcGIS FeatureServer
Won't grow here
2050
Zone 7a
Plotwright
Projected zone for this same location in 2050 (2041-2070) using SSP3-7.0 (regional rivalry).
Won't grow here
In plain terms: This location is in Zone 6b today. Its hardiness profile is cold winters, and coldest nights are typically around -3°F. By 2050, the projected hardiness zone is Zone 7a based on SSP3-7.0 (regional rivalry). That is a +0.5-zone shift from Zone 6b to Zone 7a by 2050.
Out of range today and still out of range in 2050.

Heat tolerance

Future
Heat tolerance values are location-based too: heat days today are observed at this site, and the 2050 value projects this same location under a future climate.
Loading AHS heat-zone data for this location...

Sources & citations

Cite this page
For lesson plans, articles, or research that uses this page. To cite a single upstream fact instead, use its specific source listed below.
Plotwright. (2026, May 17). Longleaf pine (Pinus palustris). Retrieved 2026, June 13, from https://plotwright.garden/plants/pinus-palustris
Sources for every fact
Every fact on this page traces to a source. 18 fields cited18 source-backed.
NC State Extension Gardener Plant Toolbox
University extension service
Backs 17 fields
Identity
Summary
Plant type
Light
Moisture
Hardiness
Heat zone
Size
Spacing
Habit
Design roles
Seasonal interest
Growth stages
Lifecycle
Regional guidance
Success tips
Designer notes
Wikimedia Commons
Photo · CC BY-SA 2.5
Backs 1 field
Image

Community photos

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