How Do I Know When My Lemons Are Ready to Pick?

Knowing when to harvest lemons and other citrus fruits is less straightforward than with many other fruits because citrus can remain on the tree for weeks or months after reaching full size without obvious external signs of overripeness. Unlike apples or pears, lemons do not fall readily when ripe, and colour change — the most obvious sign of ripeness in many fruits — can be misleading in citrus.

Colour as a guide

Most people assume lemons are ripe only when they are fully yellow, but in fact lemons in warm climates often remain partly green even when fully ripe and juicy. In cooler temperate climates, lemons grown in greenhouses or containers are more likely to turn fully yellow. Yellow skin is a good indicator of ripeness in cool climates, but a lemon that is pale green or greenish-yellow can be just as ripe and juicy as a fully yellow one. Colour alone is not a reliable indicator for all growing conditions.

Size and feel

A ripe lemon has reached full size for the variety and feels slightly soft and giving when gently pressed, rather than completely hard and unyielding. The skin should feel smooth and slightly oily. A lemon that has been on the tree too long (overripe) will feel quite soft and may look dull or slightly wrinkled. Picking when the fruit just begins to give slightly produces the best juice content and flavour.

The twist-and-snap test

When a lemon is ripe, it separates relatively easily from the branch with a gentle twist. Unripe fruit holds on firmly and resists removal. Do not yank — give a gentle twist combined with slight upward pressure. If the fruit does not come away easily, leave it another week and check again. Picking with a small pair of scissors or secateurs and leaving a short stub of stalk prevents damage to the branch.

Leaving fruit on the tree

Unlike some soft fruits, lemons can remain on the tree for an extended period after reaching maturity without serious deterioration — often weeks to months. This makes them very useful as a living larder. However, very long storage on the tree eventually causes the skin to thicken and the juice content to decline. Pick once fully ripe and use within a reasonable time for the best flavour and juice yield.

Harvesting other citrus

Oranges, mandarins, and grapefruits follow similar principles — colour, size, and gentle squeeze to feel for give. Limes are unusual in that they are often picked while still green (before they turn yellow), as the flavour peaks before full colour change. Kumquats can be left on the tree until fully orange and slightly soft.