Yes, birkin plants are toxic to cats.
The birkin plant, or Philodendron birkin, is a cultivar of the Philodendron erubescens species. Native to Colombia, the flowering plant belongs to the Araceae family. Other Araceae plants include Chinese evergreen, peace lily, and swiss cheese plants. A gorgeous houseplant, the birkin plant has large deep green leaves accentuated with striking white lines. They start off as totally white leaves, but gradually darken as they age.
Similar to other Araceae plants, birkin plants are toxic to pets and even humans. Insoluble calcium oxalate crystals are present throughout the plant’s flowers, leaves, stems, petioles, and roots. As such, it is advisable to keep birkin plants away from cats, dogs, and young children.
What to do if your cat accidentally comes into contact with, chews, or eats birkin plants: After a cat comes into contact with a birkin plant, expect her to have spasms, seizures, pain, dilated eyes, and swelling. Intense burning, difficulty in swallowing, pawing at the face, and oral irritation (mouth, lip, or tongue) may also occur.
If you suspect your pet ate a birkin plant, talk to your veterinarian immediately. Take it away from your cat. And more importantly, observe her closely in a confined space. If a trip to the emergency animal clinic is needed, bring a sample of the birkin plant to help determine its poisonous substance.
In summary: As a whole, plants that belong to the Philodendron genus can cause mild to moderate poisoning in cats. Therefore, feline pet owners should refrain from growing birkin plants and other philodendron plants.