Flowers are often associated with celebrations, romance, and thoughtful gestures, but while they can instantly brighten a room and lift someone’s mood, some varieties may also pose health risks if handled or consumed improperly.
According to Dr. Fatima Johanna T. Santos-Ocampo, a Pediatric Allergology and Immunology specialist at Makati Medical Center (MakatiMed), certain flowers contain natural toxins or produce allergens that can trigger mild to severe health problems.
Some flowers contain natural toxins
Plants produce toxic compounds as a natural defense against insects, animals, and environmental stress. While most ornamental flowers are harmless when admired from a distance, some can be dangerous if ingested or handled carelessly.
Among the highly toxic varieties are angel’s trumpet and azalea, which may cause serious illness or even death when consumed. Meanwhile, poinsettia and daffodil can lead to mild gastrointestinal discomfort, while contact with poison ivy may trigger itchy skin rashes.
Diseased plants may also pose risks
Flowers and plants can also develop fungal infections that affect their health and appearance. Powdery mildew, for instance, appears as a white coating on leaves and petals, while black spot commonly affects roses. Gray mold, meanwhile, forms a fuzzy gray layer as it feeds on plant tissue.
Although these plant diseases generally do not infect humans, Dr. Santos-Ocampo advises caution, particularly for individuals with weakened immune systems.
One example is sporotrichosis, a fungal infection that may be found on the thorns of dead roses. The fungus can enter the body through cuts or scratches and, in severe cases, affect the lungs, eyes, nervous system, bones, and joints.
Another concern is mycotoxins, toxic compounds produced by certain fungi that may cause vomiting, seizures, and other serious health complications when exposure is significant.
Pollen remains a common allergy trigger
For many people, the greatest concern comes from pollen—the fine powder produced by flowering plants as part of their reproductive process.
“When inhaled, our immune system may mistake pollen for harmful invaders such as viruses or bacteria,” Dr. Santos-Ocampo explained. “This triggers the release of histamine, leading to symptoms such as sneezing, itching, runny nose, and watery eyes. Some individuals may also experience wheezing or shortness of breath.”
Flowers commonly associated with pollen allergies include baby’s breath, daisies, dahlias, chamomile, chrysanthemums, and sunflowers.
Choosing safer flowers
To minimize allergy risks, Dr. Santos-Ocampo recommends selecting flowers that produce little airborne pollen or whose pollen is heavy and less likely to spread through the air.
Examples include:
- Roses
- Orchids
- Tulips
- Hydrangeas
- Peonies
- Carnations
- Irises
- Begonias
- Snapdragons
- Cactus flowers
Fresh flowers are also preferable since they typically release less pollen than older blooms.
People with allergies should likewise avoid flowers with overpowering fragrances, as their volatile organic compounds (VOCs) may trigger sneezing, allergic rhinitis, coughing, or asthma attacks in sensitive individuals.
Prevention and treatment
Proper plant care can also help reduce health risks. Diseased leaves should be removed promptly to prevent fungal infections from spreading, while adequate spacing between plants promotes air circulation. Garden oils and fungicides may also help protect plants from disease.
For individuals experiencing pollen allergies, over-the-counter antihistamines, decongestants, and medicated eye drops may provide relief. However, persistent or worsening symptoms should be evaluated by a healthcare professional immediately.
While flowers remain thoughtful gifts and beautiful additions to homes and gardens, experts advise choosing them carefully and being aware of potential allergens and toxins to ensure they bring joy—not unexpected health problems.
