Dogwood Allergy Shots: The Bract Biology Behind Spring Misattribution
Dogwood (Cornus florida) is insect-pollinated — its famous 'petals' are actually bracts (modified leaves), not flowers, and the true flowers produce sticky pollen carried by insects rather than wind. Dogwood has no IUIS-named pollen allergen and SCIT is not routinely indicated. Patients reporting 'dogwood allergy' during spring bloom almost always have concurrent sensitization to wind-pollinated co-occurring trees: white oak, pecan, or hickory.
Dogwood Allergy Immunotherapy: How It Works
Allergy immunotherapy is the only long-term treatment that re-trains the immune system to stop overreacting to dogwood — rather than just masking symptoms with antihistamines or steroids. By gradually exposing the body to controlled doses of dogwood allergen, immunotherapy shifts the underlying allergic response and produces relief that often outlasts treatment by 7–10 years.
There are two evidence-based forms of dogwood immunotherapy used today, both built on the same desensitization principle but delivered very differently.
of sustained relief after a complete immunotherapy course — the only allergy treatment with proven long-term effect after stopping.
Allergy Shots (SCIT)
Weekly injections of dogwood extract in a clinic, escalating over 3–6 months until a maintenance dose is reached. Continued monthly for 3–5 years. Longest clinical track record for dogwood allergy.
- Strongest evidence base for severe and polysensitized patients
- Covered by most insurance plans
- Requires 50–100+ in-person clinic visits across the full course
Allergy Drops / Tablets (SLIT)
Daily drops or dissolvable tablets containing dogwood extract, held under the tongue at home. Same desensitization principle, delivered without injections. WHO-recognized as an effective form of allergy immunotherapy since 2001.
- Taken at home — no weekly clinic trips, no needles
- Lower systemic reaction rate than allergy shots
- Curex offers prescription dogwood immunotherapy drops with allergist oversight
The rest of this page goes deep on allergen-specific immunotherapy with shots — protocol, efficacy data, side effects, and cost. If you’d rather skip the clinic and treat dogwood allergy with at-home drops, see how Curex sublingual immunotherapy compares below.
What is Dogwood?
The biology, taxonomy, and clinical fingerprint of Dogwood — the foundation of how SCIT targets it.
Flowering dogwood (Cornus florida) in spring bloom: the white 'petals' are modified leaves called bracts. The true flowers are the tiny clustered structures in the center. Insect-pollinated, not a wind-borne aeroallergen.
- Scientific name
- Cornus florida
- Family
- CornaceaeDogwood family
- Type
- Insect-pollinated ornamental deciduous tree
- Native to
- Eastern United States — Maine to Florida, west to Kansas and Texas
- Allergen proteins
- No IUIS-named Cornus pollen allergen as of May 2026
- Particle size
- Heavy, sticky — not aerosolized in clinical concentrations
- Avoidance difficulty
- Easy
How Dogwood Allergy Presents
Symptoms by body system — useful for distinguishing Dogwood sensitivity from overlapping allergies and infections.
Respiratory (typically co-occurring aeroallergens)
- Rhinitis and sneezing during April–May dogwood bloom season are driven by co-occurring white oak, hickory, or pine — not dogwood pollen
- Dogwood blooms in precise synchrony with peak oak pollen season across the eastern US, creating systematic visual misattribution
- Wind-pollinated tree pollen from oak and hickory are the documented spring respiratory aeroallergens in dogwood bloom territory
Ocular (typically co-occurring aeroallergens)
- Itchy, watery eyes during April–May reflect oak and hickory pollen, not dogwood
- The visual prominence of white dogwood bracts directs patient attention to the non-causative tree
Dermal
- Contact urticaria or dermatitis from dogwood bark and sap is occasionally reported (Lovell, Plants and the Skin)
- Type IV contact sensitization — not IgE-mediated pollen allergy
- No documented OAS food cross-reactivity from dogwood pollen
Systemic
- Systemic IgE-mediated allergy to dogwood pollen is not documented in the clinical literature
- Spring fatigue and systemic effects during dogwood bloom reflect the co-occurring spring pollen burden
- No published case series of anaphylaxis or systemic reactions attributable to Cornus florida pollen
Dogwood blooms when oak pollen peaks across the eastern US, so patients see the white bracts and blame the dogwood — the testing almost always points to the oak. Understanding that the showy display is bracts, not flowers, resolves the botanical confusion immediately.
When & Where Dogwood Peaks
Allergen intensity by month and by state. Useful for timing SCIT start dates and travel planning.
12-Month Intensity
Dogwood bloom: April–May. Pollen is not airborne. Spring symptoms during this period reflect co-occurring oak and pine pollen, not dogwood.· Insect-pollinated — no aeroallergen season. Bloom coincides exactly with peak eastern oak pollen season.
US Exposure Map
0 high-intensity statesWhat Dogwood Cross-Reacts With
Patients sensitized to one allergen often react to others sharing similar proteins. This map shows the documented molecular overlaps.
Is SCIT Right for Your Dogwood Allergy?
If you suspect dogwood is causing your spring allergies, these questions help redirect the workup toward the true likely eastern aeroallergens.
Do your worst symptoms occur on days when you can see yellow pollen dust on outdoor surfaces (cars, decks)?
The Dogwood SCIT Protocol
SCIT is not routinely indicated for dogwood (Cornus florida) — the pollen is insect-carried, not airborne, no IUIS-named allergen exists, and no clinical trial supports dogwood-specific immunotherapy. Curex IgE testing identifies the true eastern spring aeroallergens — white oak, pecan, hickory, sycamore — before any immunotherapy decision is made.
SCIT build-up is not indicated for dogwood specifically. If a comprehensive eastern spring X-tree SCIT mix is warranted based on testing, it would include confirmed wind-pollinated sensitizers — oak, pecan, hickory, sycamore — not dogwood.
SCIT maintenance for dogwood is not clinically supported. Maintenance SCIT would target confirmed wind-pollinated eastern tree aeroallergens.
Not applicable for dogwood-specific SCIT, which is not recommended.
Extract Concentration Ladder
You progress through each vial during build-up. Concentration increases ~10x per step.
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Dogwood SCIT Side Effects
SCIT is not indicated for dogwood. Side effects described here apply to SCIT for co-occurring confirmed eastern spring aeroallergens.
Local reactions
2 documentedSystemic reactions
2 documentedFor confirmed eastern spring aeroallergens, Curex at-home SCIT pairs sterile-compounded serum with a prescribed epinephrine auto-injector confirmed on-hand and a first injection supervised live over Zoom by a board-certified allergist. Dogwood-specific SCIT is not indicated — dogwood pollen is insect-carried, so the real target is the confirmed wind-pollinated aeroallergen.
SCIT vs Alternatives for Dogwood
The most effective alternative to dogwood SCIT is accurate differential diagnosis — confirming the true wind-pollinated aeroallergen and treating that instead.
| Criterion | At-home SCIT (Curex, true aeroallergen)Best | SLIT Drops | Avoidance | Medications |
|---|---|---|---|---|
| Effectiveness | Strong for oak/pecan/hickory | Moderate (extrapolated) | Moderate (avoid peak pollen hours) | Good symptom control |
| 5-yr cost | $3,500–$15,000 | $1,500–$4,000 | $0–$300/yr | $200–$1,200/yr |
| Duration | 3–5 years | 3–5 years | Indefinite | Indefinite |
| Convenience | Weekly then monthly at home | Daily at home | Lifestyle adjustments | Daily pills/sprays |
| Safety | Zoom-supervised first dose | Self-administered | No medical risk | Generally safe |
| Lasting effect | 7–12 yrs post-course | Ongoing use needed | No lasting change | No lasting change |
At-home SCIT (Curex, true aeroallergen)Best
SLIT Drops
Avoidance
Medications
For eastern spring allergy sufferers who blame dogwood, accurate sensitization testing is the key intervention. Curex IgE testing identifies the true eastern aeroallergens — typically oak, pecan, or hickory — and our at-home SCIT kit at $129/month then targets those confirmed sensitizers with sterile-compounded serum, a prescribed epinephrine auto-injector confirmed on-hand, and a Zoom-supervised first dose under a board-certified allergist.
What Dogwood SCIT Actually Costs
Insurance will not cover SCIT targeting an allergen without documented IgE-mediated sensitization with clinical correlation. SCIT for confirmed eastern spring aeroallergens (oak, hickory, pecan) is covered by most major insurers. Comprehensive spring panel testing to identify the true sensitizer is the first appropriate billable step.
Cost range varies by deductible, co-insurance, and clinic.
Verify these codes with your insurer to confirm coverage.
Flat monthly subscription — includes consult, prescription, and at-home dosing for sublingual immunotherapy.
See if you qualifyStop guessing about your dogwood allergy. Get a plan.
Take Curex’s 3-minute allergy quiz. A board-certified allergist will review your symptoms and recommend the right immunotherapy path for you — shots or drops.
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Dogwood SCIT — Frequently Asked
Quick answers to the questions patients ask most before starting treatment.
Flowering dogwood (Cornus florida) produces a floral display that is genuinely unusual in botany: the four large white or pink 'petals' surrounding the bloom are modified leaves called bracts. The true flowers of dogwood are the tiny yellowish-green clustered structures at the center of the bract display. The bracts evolved to attract insect pollinators visually to the inconspicuous true flowers — a highly effective strategy that has also fooled generations of allergy sufferers into blaming the spectacular display for their spring symptoms. Because the actual flowers are insect-pollinated (not wind-dispersed), dogwood pollen does not travel through the air in concentrations sufficient to drive respiratory sensitization.
This content is for informational purposes only and does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about a medical condition. Content reviewed by board-certified allergists at Curex.