The Science That Fuels Our Work

Plants strengthen, calm, restore, and engage.

Plants engage us and support our well-being in multiple ways. The colors, shapes, and textures of plants can catch our attention and evoke our emotions. The scents of certain plants can promote relaxation and soothe us, while other fragrances from plants restore our alertness and focus. Herb, fruit, and vegetable plants also engage our sense of taste, contributing to improved physical health. The mere sight of plants can offer a respite from modern distractions and pressures, allowing the mind and body to rest, recharge, and strengthen. 

Why does the human body respond exceptionally well to plants and natural settings?

Humans have an innate connection to plants, grounded in evolutionary history and genetics. 

Early humans depended on plants for food, shelter, and medicine. Over time, the mere sight of plants signaled safety and resources to humans, evoking feelings of calmness and relief. As humans evolved in natural environments, the human brain became hardwired to need plants for the calming and restorative effects that followed. That need has transferred genetically to future generations through human DNA. 

Hands touching plants in the garden
Zen garden sand marks graphic
Zen garden marks graphic

How Do Plants Power Wellness?

When we interact with plants, our immune systems are strengthened through a combination of physiological and psychological effects:

  • Contact with plants exposes humans to beneficial microbes that help maintain a healthy human microbiome

  • Exposure to phytoncides in plants can enhance the activity of NK cells in the human body, strengthening immune system response

  • Interaction with plants naturally reduces stress, promoting relaxation and enhancing mental well-being 

  • The tactile experience of touching plants, combined with the sights and smells they provide, offers sensory stimulation that enhances mood and brain function

Zen garden marks graphic

What Happens When We Touch, Smell, and Observe the Soil?

When humans work the soil by mixing it with their hands, beneficial bacteria in the soil — Mycobacterium vaccae — stimulate the human immune system. Engaging with the soil has been scientifically proven to:   

  • Enhance mood 

  • Reduce anxiety

  • Sharpen focus

Zen garden sand marks graphic
Zen garden marks graphic

Must One Be Outdoors to Benefit? 

No. Indoor plants also play a vital role in supporting human health. Studies, including those by the National Aeronautics and Space Administration, have proven the role of indoor plants in removing harmful toxins from the air. Other studies have demonstrated the power of indoor plants to support physical, cognitive, and emotional well-being. Various indoor plants have been shown to:  

  • Boost concentration and attention

  • Increase memory retention by 20%

  • Speed recovery from illness

  • Increase immune system efficiency and response

Zen garden sand marks graphic
Trees and nature plays a role in wellness
Zen garden marks graphic

What Role Do Trees Play in Wellness?

Trees not only tower over us; they hold great power. Immersion in a setting full of trees has been shown to: 

  • Improve cardiovascular health

  • Increase brain acuity and learning

  • Improve children’s attention and test scores

  • Boost immune system 

  • Reduce stress

  • “My kids and I absolutely loved participating in the Horticulture 4 Health activities! It was a meaningful and enriching experience for all of us. The hands-on interaction with nature not only helped my children learn more about plants, but it also encouraged them to develop a deeper appreciation for the environment. They were excited and eager to learn, and the activities truly sparked their curiosity and creativity. The sessions fostered a sense of responsibility and accomplishment, which was wonderful to see. As a parent, I loved watching them gain confidence and connect more deeply with nature. It was truly a rewarding experience for our whole family!”

    Alina, Parent of Program Participants

  • "Kelly Warnick’s skillful use and knowledge of plants, combined with her intuitive empathy, make her a valuable, results-oriented Horticultural Therapy professional. She is capable, organized, and truly dedicated to helping people achieve holistic well-being. Kelly deeply understands the healing role plants play in our lives, and is eager to help others attain the health and satisfaction that comes from experiencing the joy of connecting with plants and nature. Kelly deserves the highest commendations as an educator, advocate, and therapist in the field of Horticultural Therapy."

    Liz H., Nelson & Holmberg, Inc.

  • “Kelly is a recognized leader across the US in her leadership role with AHTA. She travels across the country engaging members, supporting their leadership development and advancing the profession. Her exemplary writing skills support the work of any agency’s PR goals and mission. Her work in Horticultural Therapy and Therapeutic Horticulture program development contribute high-quality activity and clinical programming to meet resident needs, interests and abilities. I have worked with Kelly for several years and always experience professional leadership for whatever our project may be. Your agency team will benefit from working with Kelly Warnick to develop your horticulture and garden programs year-round to serve your program and mission.”

    Teresia Hazen, MEd, HTR, QMHP (Portland, Oregon)

  • “Kelly was an outstanding professional registration intern with the Chicago Botanic Garden in 2023. Her contributions were invaluable to our team. She played a key role in delivering our Therapeutic Horticulture programs to communities on the south and west sides of Chicago, bringing warmth and professionalism to every interaction. Kelly also made a significant impact through her work at Hines Veterans Affairs Hospital, where she led engaging meditation workshops and assisted with horticultural projects. The participants loved her sessions, and we consistently received excellent feedback on her ability to connect and inspire. Kelly's dedication and creativity truly elevated our programs.”

    Dominique Stevens, Senior Manager for Health and Wellness, Chicago Botanic Garden/Windy City Harvest

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