Leaves are important to plants and trees because they convert sunlight energy into food through a process called photosynthesis. Leaves have a chemical called chlorophyll in them, which is what allows them to photosynthesize.
Leaves go through seasonal changes, which include:
Leaves change color in the fall because as temperatures cool, the chlorophyll in the leaves starts to break down, which signals to the tree that it needs to store the converted food in the tree, rather than in the leaves. The leaves change color because of the lack of chlorophyll, which is what makes the leaves green in the spring and summer months. The changing color depends on the presence of carotenoids or anthocyanins. Carotenoids are the chemicals that turn leaves brown, orange and yellow, whereas anthocyanins are the chemicals that cause leaves to turn purple or red.
Deciduous trees lose their leaves in autumn because as temperatures fall, the trees create a seal between the branch and its leaves that protects the branches from the freezing temperatures of winter. Evergreen trees, on the other hand, have needles instead of leaves, which are able to withstand the freezing temperatures because of their waxy coating. Needles remain green all year and do not change color or fall off.
The pin oak, Quercus palustris, is a tree that's native to the eastern part of the United States. It is very popular as a street tree because it tolerates poor soil conditions and pollution. It does best in soil that is a bit acidic. Because the roots of the pin oak are shallow, it can tolerate flooding after it is established, and transplanting the tree is also relatively easy.Full Answer >
Asian pear trees with brown, curling leaves are most likely infected with fire blight bacteria and can be treated with white vinegar, according to SF Gate. Spraying the plant every two weeks with a solution of 6 cups water and 4 cups white vinegar should bring the infection under control. All diseased limbs must be removed, using a shears dipped in chlorine bleach, to prevent the bacteria from spreading.Full Answer >
Mimosas should be pruned in February or March, during the dormant period. When trimmed during this time, new growth will not be affected. However, light pruning can be done any time of year.Full Answer >
Trees benefit the environment by helping to keep it free from toxins, supplying life on Earth with nutrients and combating the negative effects of harmful gases that exist in it. Trees allow consumers to save energy, further helping to reduce the impact of the overuse of resources.Full Answer >