An apple straight off the tree in September crunches so loudly you almost hear it inside your head. A shop apple can be just as red and even the same variety — and still not taste quite the same. Why do apples taste different? Much of the answer lies in something few people think about: what the apple keeps doing after it is picked.
What happens to an apple after it is picked?
An apple does not stop living when the stem snaps. The cells in its flesh still take in oxygen and give off carbon dioxide. The apple breathes — just far more slowly and quietly than you do.
While it breathes, it keeps ripening. Starch, the same stuff that makes potatoes floury, slowly turns into sugar. The sourness fades, and the flesh softens until the crunch is gone and the apple turns mealy — its skin slightly wrinkled, its flesh giving under your thumb.
The apple in your fruit bowl is not finished. It is alive — and its flavour keeps changing while it sits there.
Many shop apples are picked before they are fully ripe and stored cold for months, often with little oxygen so they breathe slowly. A garden apple hangs on the tree until it is ready. And much of what we call taste is really smell, which a freshly picked apple has plenty of.
Try it at home: the blind apple test
Suitable for: 5–12 years. Take three apples of one variety, bought or picked the same day. Eat one today. Put one in the fridge and one in the fruit bowl for a week. An adult then cuts a slice of each onto plates marked underneath. Everyone writes down a guess — which will be sweeter? — and tastes blindfolded, first holding their nose, then with it open. ⚠️ An adult handles the knife.
Let go of your nose and the flavour rushes back. It is the same nose that tells you rain smells good.
Then try this: what happens if you put a green banana in a paper bag with a ripe apple?
Questions to wonder about
- Why do some apples fall before the others on the same tree?
- When does an apple actually stop living — when it is picked, when it is eaten, or never quite?
- If an apple can breathe without lungs, what is really doing the breathing: the apple, or every tiny cell inside it?
Look at the fruit bowl with new eyes
An apple in a bowl looks like it is waiting, but it breathes, sweetens and softens — and one day fungi and bacteria turn it back into soil, as in a compost heap. Spotting hidden change in ordinary things is the heart of STEAM learning.
Every child is made of good atoms. Next time you take an apple from the bowl, hold it a little longer than usual — and remember that it is still breathing.
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