Apple
Malus sylvestris · Rosaceae
How it looks
The apple tree (Malus sylvestris) is a deciduous tree distinguished by serrated, oval, dark-green leaves and white-to-pink flowers that bloom in spring. In autumn it bears round red, yellow, and green fruit in clusters. Height 10-33 ft (3-10 m); common in gardens and orchards.
Caution — cyanide in the seeds, leaves, and stems
The stems, leaves, and seeds of the apple tree contain cyanide, and ASPCA notes the plant is particularly toxic while it wilts. If swallowed it can turn the mucous membranes brick red, dilate the pupils, and lead to difficulty breathing or shock.
If ingested
Contact your nearest vet immediately
- Action
- Consult a vet and monitor. Go in immediately if symptoms worsen.
- Symptoms
- Brick red mucous membranes, Dilated pupils, Difficulty breathing, Shock
- Onset (typical course)
- 1–4 hours after ingestion
Guide for parents
The parts ASPCA names are the stems, leaves, and seeds of the apple tree. It says nothing about the flesh, but the core and pips left over after you slice an apple should go straight into a bin your cat can't open.
Wilting is what matters most: ASPCA notes the plant is particularly toxic in the process of wilting, so pruned twigs and leaves left to dry out are worse than fresh ones.
If you suspect your cat has eaten some, check the gums and the inside of the eyelids. If the usual pink has turned brick red, or the pupils are dilated and breathing looks laboured, call your vet right away.
Details
- Scientific name
- Malus sylvestris
- Common name
- Apple
- Family
- Rosaceae
- Toxic parts
- Stems, Leaves, Seeds
- Compounds
- Cyanogenic glycosides
- Source
- ASPCA cats plant list
Related plants
Same plant family· Rosaceae
Related guides

Top 10 Flowers Dangerous to Cats — The Ones You See at Florists
Ten flowers you'll commonly find at florists and grocery stores that are toxic to cats. Check before you receive them, and before you bring them home.

Got a Bouquet? What to Do If You Have a Cat
A bouquet is a lovely surprise — but if you live with a cat, there are a few things to take care of right away. From checking what's in the arrangement to choosing the right vase, here's what actually helps, in order.

Why Cats Chew Plants, and How to Stop It
A cat chewing and tearing at plants isn't just mischief — there's an instinct behind it. Once you understand why, the ways to stop it follow naturally.
