Green peel does not mean unripe fruit
An orange’s peel can stay green even after the fruit inside is ready to eat. The green comes from chlorophyll, the pigment plants use to capture light. As many oranges mature, chlorophyll in the peel breaks down, revealing yellow and orange pigments that were already there. In warm-growing regions, the conditions that prompt this color change may be weak, so chlorophyll can remain and mask the warmer hues.
Ethylene changes the peel’s appearance
Some growers expose harvested oranges to ethylene, a gas that plants naturally produce. It prompts chlorophyll in the peel to break down, making the orange and yellow pigments easier to see. This process is called degreening: it changes the fruit’s outward color, not its readiness to eat. Peel color alone is therefore a poor test of whether an orange is ripe.
A market preference shapes the finish
The extra step reflects a gap between agricultural maturity and shoppers’ expectations. In places where customers associate a bright orange peel with a ripe orange, green fruit may be passed over even when its flavor is fully developed. Degreening helps the fruit look familiar on the shelf—but a green tropical orange can be just as ready to eat.
