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Coniferous trees, other than those that are deciduous such as the baldcypress tree [Taxodium distichum] look green all year long because they drop and regrow their foliage in the course of more than a year instead of the less than a year that's the hallmark of deciduous trees.

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14y ago
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11y ago

because your mom keeps putting leaves on them

They do lose their leaves as the leaves age but not all at once.

The leaf loss is spread thoughout the year so the loss is not noticed.

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6y ago

Because in the winter or the dry season it becomes difficult for the tree to maintain its water balance as there is less free water available in the soil. The lack of water damages the leaves cells. Instead of remaining actively growing during this time of the year the tree enters a dormant period. win
If the leaves on deciduous trees did not fall, the water in the leaves would freeze causing the cells in the leaf to eat themselves from the inside using the lysosomes.

In addition: Its to protect the tree. It makes the tree less heavy when coated with ice because of less surface area. It makes the tree more wind resistant during winter storms. Deciduous trees don't have tap roots like pine trees and the roots travel far from the trunk, just not deep. If they did not lose their trees every fall, the winter could damage the tree badly or kill it. In addition:The days begin to get shorter after the summer solstice, but are still longer than the nights. By the time after the autumnal equinox arrives, days still get shorter and the nights are longer than the days (the days last fewer than 12 hours). If a day does not last as long as or longer than a night during a period of 24 hours, there is not enough daylight for leaves to hold their chlorophyll, so the leaves dry up and become different colors and then fall off the trees.
If the leaves on deciduous trees did not fall, the water in the leaves would freeze causing the cells in the leaf to eat themselves from the inside using the lysosomes. In addition: Its to protect the tree. It makes the tree less heavy when coated with ice because of less surface area. It makes the tree more wind resistant during winter storms. Deciduous trees don't have tap roots like pine trees and the roots travel far from the trunk, just not deep. If they did not lose their trees every fall, the winter could damage the tree badly or kill it. In addition:The days begin to get shorter after the summer solstice, but are still longer than the nights. By the time after the autumnal equinox arrives, days still get shorter and the nights are longer than the days (the days last fewer than 12 hours). If a day does not last as long as or longer than a night during a period of 24 hours, there is not enough daylight for leaves to hold their chlorophyll, so the leaves dry up and become different colors and then fall off the trees.
Trees lose their leaves because the leaves have fully matured and are no longer needed. The leaves falling is part of a tree maturing. When leaves fall, it allows for pollination to occur and new leaves to grow.
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11y ago

Plants which loose their leaves in the fall/ autumn are called deciduous.

Leaf fall is triggered by a number of factors:

  • Decrease in average daylight hours
  • Decrease in average temperature
  • and in some instances decrease in the level of available moisture.

At this point enzymes are released into the plant and stop the production of chlorophyll (the green photosynthetic pigment in leaves and stems). Some species of plants absorb what nutrients are left in the leaves back into the trunk or stem of the plant, in most cases other pigments such Beta-Carotene and Xanthophyll are left behind in the leaves (enhancing the colour effect)

An abscission layer forms between the petiole and the stem, this is basically a layer of callus cells so that the leaf does not leave an open wound when if falls, the abscission layer also facilitates the breaking away of the leaf from the stem.

Leaves fall when the abscission layer breaks - disturbed by the wind or under their own weight.

There are a number of reasons why deciduous plants drop their leaves:

  • Fall is normally the onset of cold winters, in most cases if the foliage remained behind on the tree it would simply be damaged by snow, frost or wind. Ice crystals can begin to form in the cells at a temperature of about 4 degrees C, these grow and puncture/ rupture the cells killing them; this is the reason for the cold related phenomon known as "black frost"
  • Some winter climates have snow, this means that there is in actual fact very little usable water available to the plant (ground water is frozen and snow does not melt readily and provide sufficient water for the plant to survive).
  • Trees with large surface areas in storm frequented areas are regularly damaged by high winds, shedding leaves increase the aerodynamics of the plant and is a survival mechanism.
  • The leaves which are shed collect around the base of the plants and are normally covered by snow, this assists in creating a bit of a buffer zone and possibly preventing root damage (like a blanket).
  • After winter the fallen leaves decompose and release what nutrients and minerals they have stored inside them back into the soil - which the plant then reabsorbs.
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13y ago

Coniferous trees don't lose their leaves in the fall because it's as a adaptation to low nutrient levels.

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13y ago

Evergreens are covered in a wax like coating and the cells contain a fluid that resists freezing .

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14y ago

No, except for a couple of exceptions the Ginko and the Larch which do drop their leaves in Autumn.

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9y ago

The deciduous trees of temperate forests lose their leaves in the fall. This is a survival tactic for dealing with the long, cold winters often experienced in temperate forests.

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12y ago

They have needles instead of leaves because they can support the heavy weight of the snow better than leaves

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Q: Why don't evergreen trees lose their leaves in winter?
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Related questions

What are some tree that dont lose their leaves in winter?

Evergreens do not lose their leaves in the winter. Deciduous trees are the name given to those trees that lose their leaves in the winter. There is also a such thing as evergreen deciduous trees which have characteristics of evergreens besides the fact that they DO lose their leaves in the winter.


What is the opposite of a evergreen tree?

Evergreen trees keep their leaves/needles over the winter months. Deciduous trees lose their leaves during the winter months.


Do broad-leaved trees lose their leaves in winter?

Yes. They lose their leaves every year, all around the fall. Coniferous trees such as pines, on the other hand, lose their leaves continuously all year long, so they are never completely bare.


Why do evergreen trees have needles all year round?

Evergreen trees do lose their leaves but not all at once like deciduous trees.Evergreens drop leaves as they age rather than all at once in the autumn.


What tree leaves don't fall off the tree?

Trees that do not loose their leaves are called Evergreens as opposed to Deciduous or those that do loose their leaves in the autumn/winter. Examples of Evergreens are Conifers- blue spruce, cedar- holly, oak.


Do pine trees lose their leaves in winter?

No, pine trees do not have leaves. They have pine needles that have a waxy coat on them. People refer to them as pine leaves sometimes, but that isn't what they are.


What part of Alaska has evergreen trees?

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Is a banana evergreen or deciduous?

Bananas dont grow on trees


What is the definition of evergreen?

evergreen trees r those which do not shed their at the particular time of the year.eg-i dont know?


Leaves falling in winter?

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Is a banana tree deciduous or evergreen?

Bananas dont grow on trees


Why do evergreen trees change color in the fall?

They dont, you must be mistaken.