Lemon Tree
Also known as Lemon, Meyer Lemon. One plant, one grade per pet — the verdicts below are transcribed from primary sources and human-reviewed.
Lemon trees are an irritant to cats (S2 Irritant): the essential oils and psoralens in the peel, leaves, and stems can cause vomiting, diarrhea, depression, and possible dermatitis — the ASPCA notes the fruit itself is edible.
FULL VERDICT →Lemon trees are an irritant to dogs (S2 Irritant): the essential oils and psoralens in the peel, leaves, and stems can cause vomiting, diarrhea, depression, and possible dermatitis — the ASPCA notes the fruit itself is edible.
FULL VERDICT →Care at a glance
What happens if it's eaten
Signs on record for each animal, transcribed from the cited sources.
- vomiting
- diarrhea
- depression
- dermatitis (potential)
- vomiting
- diarrhea
- depression
- dermatitis (potential)
When to call the vet
Call your vet if vomiting or diarrhea persists or worsens, your cat seems unusually quiet or stops eating, or a skin reaction spreads.
FULL VERDICT →Call your vet if vomiting or diarrhea persists or worsens, your dog seems unusually quiet or stops eating, or a skin reaction spreads.
FULL VERDICT →Safe swaps, graded S0
Non-toxic on record for cats — verified against the index at build time.
FAQ
Is it the lemon fruit or the tree that is the problem?
The tree and the peel, not the flesh. The ASPCA's lemon entry draws the line itself: "Fruit is edible, skins and plant material can cause problems." The toxic principles it lists are "Essential oils and psoralens," and the signs are "Vomiting, diarrhea, depression; potential dermatitis" — a stomach upset plus a possible skin reaction, which is why the plant grades S2 Irritant rather than S1. The ASPCA gives the same record, word for word, for lime. If a cat has chewed leaves, twigs, or peel, move the plant out of reach and watch for vomiting, diarrhea, low energy, or irritated skin; call your vet if signs persist or worsen.
Do lime trees get the same verdict as lemon trees?
Yes — on the ASPCA record they are the same entry twice. The ASPCA's Lime page (Citrus aurantifolia) repeats its Lemon page word for word: toxic principles "Essential oils and psoralens," and signs of "Vomiting, diarrhea, depression; potential dermatitis. Fruit is edible, skins and plant material can cause problems." So a potted lime is the same S2 Irritant as a potted lemon, for the same reason — the peel, leaves, and stems, not the flesh. We have not transcribed the ASPCA's other citrus entries, so this answer stops at lemon and lime. If a pet has chewed leaves or peel, watch for vomiting, diarrhea, low energy, or irritated skin; if signs persist, call your vet.