Why are Healthy looking Trees Dropping Limbs Around Charleston
A large limb can fall from a tree with a full, green canopy. That is unsettling, especially when several failures happen in one season. Around Charleston, this year's dry conditions give us reason to pay closer attention, but the weather alone cannot explain or predict the failure of any particular tree.
Charleston's dry start matters
The National Weather Service reported that Charleston International Airport received below-normal rainfall in every month from September 2025 through March 2026. That seven-month stretch was the second driest September–March period on record there: 49% of normal rainfall, a 13.31-inch deficit. Conditions vary by property, soil, and local rainfall, but those measurements show that area trees entered spring following a prolonged moisture shortage. [1]
What research tells us about coastal oaks
This is not the first time drought has raised concern for South Carolina's coastal trees. In a 1983 study, Clemson researchers described extensive oak decline and mortality along the coast following severe droughts. They identified water oak, laurel oak, willow oak, and southern red oak among the species most affected and linked the injury to reduced soil water availability. That paper studied decline and death; it did not establish that drought directly causes a sound branch to snap. [2]
There is also a documented phenomenon called summer branch drop. In a published arboriculture paper, Richard Harris described apparently sound limbs breaking from mature trees during calm summer weather. University of California Cooperative Extension notes that these failures often involve long, horizontal branches and that the mechanism remains uncertain. Drought may contribute, but it is not a proven explanation for every sudden break. [3, 4]
What should homeowners look for?
Pay particular attention to large limbs over homes, driveways, play areas, and regularly used paths. From the ground, look for dead or hanging branches, fresh cracks, cavities, visible fungi near the base, a new lean, lifted soil, or recent digging and grading near roots. A full green crown is useful information, but it does not rule out a structural problem. Do not stand under a damaged limb or try to test it yourself. If a large limb has already fallen, keep people clear and take photos of the tree, the break, and the surrounding ground from a safe position. Note whether the break occurred at the trunk or farther along the branch, and whether there was wind or a storm. These details help an arborist distinguish among possible causes. If you are concerned about a mature tree on your Charleston-area property, contact Lowcountry Branch for an on-site inspection. We can look at the specific tree, its site, and any targets below it, then discuss sensible next steps. No inspection can promise that a tree will never fail, but a closer look is more useful than guessing from a green canopy or the season's weather.
Research and weather sources
1. National Weather Service Charleston, Drought Information Statement, April 3, 2026.
2. Tainter, F. H., Williams, T. M., and Cody, J. B. (1983). “Drought as a Cause of Oak Decline and Death on the South Carolina Coast,” Plant Disease 67:195–197.
3. Harris, R. W. (1983). “Summer Branch Drop,” Journal of Arboriculture 9(4).
4. University of California Cooperative Extension, “Summer Branch Drop in Oaks” (2022).
