Lemon or Sweet orange: how to tell them apart?
Lemon and Sweet orange look alike and are often mixed up. Here is how to tell them apart, feature by feature, with their photos and the details to look for.
⚡ The quick answer
Lemon
Citrus limon
Sweet orange
Citrus sinensis
Both share very similar glossy, aromatic evergreen foliage, but the leaves of the sweet orange are clearly smaller than those of the lemon. Lemon flower buds are tinged with purple before opening (pure white flowers in the sweet orange), and its oval, thin-skinned yellow fruit contrasts with the round, thicker-skinned orange.
🍃 Leaves
Evergreen, ovate, leathery, glossy, aromatic when crushed
Evergreen, ovate, glossy, aromatic when crushed, petiole slightly winged
🌸 Flowers
White, purple-tinged in bud, strongly scented, often clustered
White, very fragrant (orange blossom), clustered or solitary
🍎 Fruits
Citrus-type berry (hesperidium), generally yellow when ripe, with a rind rich in essential oils and a very sour pulp.
Large round citrus fruit, orange when ripe, sweet pulp divided into segments
🪵 Bark
Grey, smooth; twigs sometimes slightly spiny
Greyish, smooth on young specimens
📏 Size
3 to 6 m tall
6 to 10 m tall
🗺️ Habitat
Grown in pots or in the ground in mild climates, notably around the Mediterranean
Planted in orchards and gardens, mild Mediterranean climate
⚠️ Toxicity
Fruit widely eaten by humans. However, the essential oils and certain parts of the citrus can be irritant, and citrus fruits pose toxicity problems for pets (cats, dogs).
Fruit edible for humans; the leaves, bark and zest contain essential oils and psoralens that are toxic to dogs and cats (digestive upset, dermatitis)
🔎 And from the Sweet orange side
Both share very similar glossy, aromatic evergreen foliage, but the leaves of the sweet orange are clearly smaller than those of the lemon. The lemon's flower buds are tinged with purple before opening (pure white flowers on the orange), and its oval, thin-skinned yellow fruit contrasts with the round, thicker-skinned orange.
🌿 Go further
Want to practise spotting these details on real photos? Floraneo offers profiles and quizzes for dozens of look-alike species.
ℹ️ Educational profile — do not use it to judge whether a plant is edible or safe.