Flowering dogwood (Cornus florida) is South Carolina's official state tree — the dominant understory native in Upstate SC forests and one of the most planted ornamentals in residential yards. It has specific site requirements (woodland edge conditions, morning sun, well-drained soil) and is susceptible to Discula anthracnose, the fungal disease that has significantly changed how arborists manage it across the Southeast.
How to Identify Flowering Dogwood
- White or pink flower bracts in April before leaves emerge — the "flowers" are actually modified leaves surrounding the true small flower cluster
- Opposite, elliptical leaves with veins that curve parallel to the leaf edge; red-purple fall color
- Distinctive blocky, checkered bark pattern on mature trees
- Red drupes (berry clusters) in fall, eaten by birds and wildlife
- Typically small — 15–30 feet at maturity; multi-stemmed or low-branching habit in understory settings
Dogwood Anthracnose — The Main Disease Threat
Dogwood anthracnose (Discula destructiva) is a fungal disease that emerged in the eastern US in the 1970s and has since become the primary health concern for Cornus florida throughout the Southeast. It causes tan spots with purple margins on leaves, blighted shoots, epicormic sprouts from the trunk and major branches, and — in severe cases — trunk cankers that kill the entire tree. It is most severe on trees in dense shade or with poor air circulation, and most active in cool, wet spring weather. Upstate SC dogwoods in forest understories are more susceptible than those in open, well-drained settings with morning sun and good air movement. There is no curative treatment; management involves fungicide applications (propiconazole or thiophanate-methyl) in early spring to protect healthy tissue, removing dead and infected wood, and improving air circulation around the canopy.
Pruning Timing and Technique for Dogwood
The correct pruning window for flowering dogwood is immediately after bloom — late April through May. Pruning before bloom removes the flower buds. Pruning in summer or fall during active growth periods opens wounds that are susceptible to Discula infection during the moist fall period. Late winter pruning is the second-best option when post-bloom pruning was missed. The exception is dead wood removal, which can and should be done at any time — dead wood in a dogwood' crown is an entry point for Discula. Do not apply wound sealants to pruning cuts on dogwood — they do not prevent infection and can trap moisture against the wound.
Sun vs. Shade — Siting Considerations
Flowering dogwood is a native understory tree that evolved in dappled shade. It tolerates full shade but blooms best with 3–4 hours of direct morning sun. In full sun with no afternoon shade, it often shows leaf scorch and drought stress in Upstate SC summers, particularly during dry years. The ideal planting position: morning sun, afternoon shade, well-drained soil with organic matter, mulched root zone. Many homeowners plant dogwood in full sun because that is where it is most visible — this often produces a stressed tree with reduced bloom and higher anthracnose susceptibility. For new plantings, choose a position that mimics the woodland edge conditions where dogwood naturally thrives.