The archive · Marketing & Growth · Marketing decision · 2023–2024
Claritin's DiversiTree plants 200,000 female trees and cuts pollen 25% in one year
To fight America's top allergy trigger, Claritin plants female trees that trap pollen instead of shedding it — 200K+ in year one, 25% less pollen.
Bayer Consumer Health (Claritin)
What it had to solve
Tree pollen is the leading cause of seasonal allergies in the US, affecting more than 30% of Americans. Claritin's award entry points to a 1949 USDA recommendation that pushed cities toward male-only trees to avoid fruit cleanup, leaving a botanical imbalance that raised pollen levels — so the allergy-relief brand decided to help prevent allergies rather than only relieve them.
How it works
In the US, tree pollen is the leading cause of seasonal allergies, affecting more than 30% of people. Claritin's DiversiTree Project identified a cause that few experts talked about: the urban forest itself. A 1949 USDA recommendation had led cities to plant male-only trees to avoid the cleanup of fruit-bearing females — and male trees are the ones that release allergenic pollen, while female trees absorb it.
Claritin and Energy BBDO turned that botanical imbalance into a public project. The brand sponsored female-tree plantings in parks and streets across America, gave trees away so individuals could join in, and aimed the campaign's evidence at policymakers and city planners. The ambition was not just fewer symptoms but a pollen-free future: green spaces redesigned so that allergy sufferers could live without them.
The first-year results, as reported on the One Show 2024 award entry, were 200,000+ female trees planted, a 25% reduction in pollen levels, and more than 6.5 million square feet of allergy-fighting green space — alongside a +255% lift in branded searches for Claritin and "Fighting Pollen." The work won Best of Experiential & Immersive at the 2024 One Show and Best in Show at the 2024 ANA In-House Excellence Awards.
Why it lands
- The campaign changed the physical environment rather than only making claims: each tree is a functional fix an allergy sufferer can see and visit.
- The root cause was a story no competitor was telling — a 1949 USDA recommendation that accidentally built pollen-heavy cities.
- Anyone could request or plant a female tree, so the idea scaled through participation and earned attention instead of media weight alone.
- Outcomes were tied to prevention — fewer trees shedding pollen, more green space — not just impressions, which gave the brand credible proof.
- Recognition from One Show and ANA showed the industry read it as creative work, not corporate social responsibility boilerplate.
What it did
The award entry reports 200,000+ female trees planted in the first year, a 25% drop in measured pollen levels and over 6.5 million square feet of allergy-fighting green space created, plus a +255% lift in branded searches for Claritin and "Fighting Pollen." The work won Best of Experiential & Immersive at the 2024 One Show, was named Best in Show at the 2024 ANA In-House Excellence Awards, and later took a Clio Health Grand Award.
What you can take
A brand that cannot be the news can still change the environment the problem comes from: the fix itself, not the ad about the fix, becomes the message.
Since then
Claritin kept the program running with a stated goal of one million female trees planted by 2040, according to the ANA's 2024 announcement of its In-House Excellence Best in Show award. The campaign's results and plantings continued to be cited as it collected further honors, including a Clio Health Grand Award. Its bigger shift was conceptual: it repositioned an allergy pill brand as a participant in urban planning, and made 'female trees' part of the public vocabulary of allergy prevention.
Sources
- The One Show 2024 — Bayer Consumer Health / Claritin: The DiversiTree Project (award entry)
- ANA Announces 2024 In-House Excellence Award Winners
- 2024 The One Show 全场大奖合集 (2024 One Show Best-of collection)
- Bayer Consumer Health – Claritin: The DiversiTree Project
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