Green Stay
Green Stay
I have two orange trees in the back yard . Why do the oranges always stay green?
I moved here in June and the oranges have been on the tree ever since. When are they good to eat?
Thanks for all of the great info. I am in Florida. Some of the oranges are falling off of the tree and the skin is soft, so I wasn't sure.
Oranges are not always orange. In some countries where the temperatures never cool off, oranges remain green, even when mature. It is the cool temperatures which promote the release of the orange pigments (carotenes). If the temperature fluctuates, the fruits may alternate from one colour to the other. To overcome this problem, oranges are often treated with ethylene, which promotes the development of a uniformly "orange" appearance. Depending on the variety, oranges can also be yellow or mottled with red. Their size also varies from being as large as a football to as small as a cherry. The flavours range from sweet to intensely sour.
Oranges look the most appealing when they are a deep, vibrant orange colour; but, on the tree, a mature orange is usually green-skinned. It will turn orange only if the cold temperature destroys the green chlorophyll pigments, allowing the yellow carotenoids underneath to show through. In warmer climates, oranges are always green; but, in the US, oranges are green only if they are picked in the fall before the first cold snap or if they are picked early in the spring when the tree is flooded with chlorophyll to nourish the coming new growth. Green oranges will also change colour if they are exposed to ethylene gas which, like the cold, breaks down the chlorophyll in the skin. Oranges are often dyed to attain the orange colour that consumers demand.
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