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Leaves on deciduous trees change colour in the Autumn prior to dropping.
leaves change their colour when there is a shortage of water in them and when the quantity of chlorophyll is decreased by shortage of water.
Most broad-leaf trees are deciduous, so they lose their leaves in autumn. As part of that process they will change colour and start to die off and fall from the trees.
Deciduous trees :)
temperature and sunlight
Leave do no actuly change colour they die and rot away
It Will Change the Colour of the leaves
Pine trees leaves do not change colour during autumn, as they are evergreen trees.
The leave of some trees change from green to what is often termed as 'Autumn Tints' especially by artists and photographers. Therefore, the season of colour change is Autumn (know as Fall in America).
Ireland has a wide variety of plants. There are evergreen or coniferous trees, and also deciduous trees, which will lose their leaves. During the course of the year those leaves will change colour.
No they stay green year round, hence the name (ever-green).
Leaves change colour because the green pigment (chlorophyll) is degraded, then other pigments like anthocyanins (red or purple) and carotenoids (yellow) are exposed. So the change is more chemical than physical. Leaves going brown are also caused by chemical changes, but it also means the leaf cells are dead or dying.