It is valid to be concerned about the toxicity of house plants. It is only natural to want to ensure a harmonious and healthy coexistence between plants and pets.


Accessing information on plant toxicity is simple, often through lists categorizing plants as toxic or non-toxic for pets. However, it is crucial to understand the source and degree of toxicity, as well as take measures to minimize risks to animals and plants.

Plants, when faced with predators, cannot flee like animals because they are rooted. As a result, plants have developed defense mechanisms to discourage attacks. One strategy is the production and accumulation of toxic substances for predators, which helps overcome their immobility.

These substances impart an indigestible effect and intense flavor (which tends to be unpleasant) to the leaves and organs, deterring attacks from herbivores and omnivores. However, it is not believed to be intended to cause the death of the predator.


Cat near a house plant


Pets are not natural predators of these species in their natural environment. The substances only become a threat if consumed in significant quantities.

Calcium oxalate is a widely produced weapon used by plants. It consists of acicular crystals formed into bundles of tiny needles. Ingesting this substance causes numbness and a burning sensation, and its bitter taste serves as a deterrent to animals. It effectively prevents large amounts of the plant from being ingested.

The ingestion of these irritating substances can still cause symptoms like vomiting and diarrhea. These symptoms are actually the body's way of eliminating the ingested plant material and aiding in its recovery.

Consider that nature's strategy is to discourage animals from attacking plants until they consume a quantity that could pose a significant threat to their health or even be fatal.

Attacks are typically characterized by repeated consumption of small quantities of the plant, which is why the deterrent effect is important. However, it may not always be sufficient to prevent new attacks, although they rarely endanger the life of a healthy animal.


Dog near a house plant


Understanding the source, risk, and symptoms of this toxicity can alleviate concerns about plant toxicity to animals and inform strategies to minimize risks.

Regularly monitor animal behavior when introducing plants at home and controlling plant conditions.

Every case varies. Some animals disregard all forms of plants while others become fixated on every form of plant.

Use suspension systems to elevate plants (e.g. macramé) and utilize furniture like shelves, cupboards, and the top of the refrigerator to keep them out of reach of companion animals. Use furniture as barriers to limit access. Train animals to avoid plants. Apply pet repellents. Use non-toxic plants, especially larger ones for ground placement.


Cat and a plant


Some common and appreciated plants like Monstera deliciosa (Swiss cheese plant), Philodendron scandens (Heartleaf philodendron), and Epipremnum aureum (Devil's ivy) are on the list of toxic plants due to their high content of calcium oxalate.

Among the non-toxic plants, equally popular and commonly found in our homes, discover Dypsis lutescens (Areca palm), Platycerium bifurcatum (Staghorn fern),  Asplenium nidus (Bird's-nest fern), Pachira aquatica (Money tree), Peperomia rotundifolia (round leaf Peperomia), Beaucarnea recurvata (Ponytail palm), and Pilea peperomioides (Chinese Money Plant).

Refer to the comprehensive list of toxic and non-toxic plants for dogs and cats provided by the American Society for the Prevention of Cruelty to Animals (ASPCA).

A harmonious cohabitation between plants and animals in our homes can be achieved. Your presence will enhance well-being and happiness in our daily lives.

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