The plant has fairly assurgent growth. Its young branches are reddish, with leaves up to 20 cm long.
The flowers grow in clusters and are very fragrant. The petals of the buds are reddish, but turn white when the flower opens.
The pale yellow fruit may reach a length of 20–30 cm and is a characteristic elongated shape, sometimes pointed with a slight protuberance at the pedicel. The rind is very rough and exceptionally thick. Indeed, 70% of the fruit is constituted by pith, which is juicy and consequently eaten along with the flesh.
The Piretto citron is sour, but sweeter than a lemon, allowing it to be used in salads and side dishes.