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  1. Why Leaves Fall from Trees in Autumn

    • As winter descends, trees in temperate and boreal zones face punishingly cold temperatures and frigid winds, conditions that would damage leaves, so trees have to reduce themselves to their toughest part… See more

    How Pigments Play A Part

    It’s all about chlorophyll—the green pigment that allows plants to absorb sunlight and turn it into food that can be stored for winter dormancy, much as a bear stores fat fo… See more

    The National Wildlife Federation Blog
    Best Weather For Colorful Falls

    The most-dazzling displays of scarlet and crimson occur in autumns marked by warm, bright days and cool, crisp nights with temperatures above freezing. Sun-lit autumn da… See more

    The National Wildlife Federation Blog
    Losing Leaves

    Eventually, autumn leaves must fall. By the end of summer, they may be damaged by insects, disease or general wear and tear and ready for renewal. They are equipped to self-destr… See more

    The National Wildlife Federation Blog
    The Autumn Gardener

    Nature seems to abhor waste, so it is no surprise that though leaves may fall to earth, they still have not outlasted their ecological role. As they decompose, their nutrients tri… See more

    The National Wildlife Federation Blog
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  2. Autumn leaves fall because123:
    • Deciduous species generally have thin leaves that are susceptible to cold temperatures. Autumnal leaf drop is a form of self-protection.
    • In response to the shortening days and declining intensity of sunlight, leaves begin the processes leading up to their fall. The veins that carry fluids into and out of the leaf gradually close off as a layer of cells forms at the base of each leaf.
    • The beginnings of leaf drop, also known as abscission, start when a layer of cells is formed between where the leaf stalk joins the stem. This layer, known as the abscission layer, is formed in the spring during active new growth of the leaf. In autumn, hormones within trees begin to change.
    The peak time for foliage change is typically the second and third week of October4.
    Learn more:
    It turns out autumnal leaf drop is a form of self-protection. While evergreen plants in cold climates have thick waxes and resins to protect their leaves from freezing and fracturing, deciduous species generally have thin leaves that are susceptible to cold temperatures.
    www.britannica.com/story/why-do-leaves-fall-in-aut…
    In early autumn, in response to the shortening days and declining intensity of sunlight, leaves begin the processes leading up to their fall. The veins that carry fluids into and out of the leaf gradually close off as a layer of cells forms at the base of each leaf. These clogged veins trap sugars in the leaf and promote production of anthocyanin.
    www.fs.usda.gov/visit/fall-colors/science-of-fall-colors
    The beginnings of leaf drop, also known as abscission, start when a layer of cells is formed between where the leaf stalk joins the stem. This layer, known as the abscission layer, is formed in the spring during active new growth of the leaf. In autumn, hormones within trees begin to change.
    www.woodlandtrust.org.uk/blog/2020/10/why-autu…
    Typically, the second and third week of October are the peak times, but it shifts depending on where you live and your local weather conditions. Foliage starts to change in the northern-tier states out West and in the Midwest by late September. By October 4, the leaves in some areas will be past their prime.
    www.almanac.com/fall-foliage-color-map-when-pea…
     
  3. Why Do Leaves Fall in Autumn? | Britannica

    In temperate regions of the world, autumn is marked by the brightly colored foliage that slowly drops from trees and shrubs to carpet the ground. But why do some plants shed their leaves before winter? It turns out autumnal leaf drop is …

     
  4. Why Do Leaves Fall in Autumn? | Weather.com - The …

    Apr 2, 2019 · One of the most common visuals of fall is the sight of red, orange and yellow leaves falling from trees and coloring the ground. However, why this happens is not as well known.

  5. Why do leaves change color in the fall? - Smithsonian …

    Why do leaves change color in the fall? Autumnal leaves in vibrant hues are a beautiful part of the season, but those leaves are also a vital part of keeping trees alive. Trees that have leaves that change color in fall are deciduous.

  6. Why do leaves change colour and fall in autumn?

    Discover why leaves reveal their inner chemistry when chlorophyll breaks down – and how to brighten your lessons on colour changes with this context Every autumn, nature swaps its coat of green for an ensemble of red, yellow, orange …

  7. Signs of Autumn: Flying Birds, Falling Leaves, and …

    Sep 12, 2024 · Some leaves are already falling, and the leaves on many of the trees are starting to change color. Observe the reds, oranges, yellows, and browns of falling leaves. Interestingly, leaves do not change because of cooler …

  8. Which factors trigger leaf die-off in autumn? - ScienceDaily

  9. How do trees change in the fall? - U.S. National Park …

    Sep 25, 2019 · Why some leaves fall off... Broadleaf trees are responsible for the colorful annual display that defines autumn. For most of the year, a bright green chemical called chlorophyll supports photosynthesis in leaves.

  10. Why Leaves Fall in the Fall - Science | AAAS

    Feb 20, 2009 · The annual spectacle of leaves turning color and falling to the ground has long inspired poets, entranced children, and tasked homeowners with autumn raking. For their part, scientists have puzzled over the genetic …

  11. Why do leaves change color and why do leaves fall off …

    Oct 12, 2018 · The cool fall temperatures cause the closing of leaf veins and prevent sugars from moving out which prolongs fall color. Thus a succession of warm sunny days and cool crisp nights can create quite a display.

  12. How do leaves change color and why do they fall?

    Sep 27, 2024 · Want to know how and why leaves change color in the fall? We've got you covered, unlike the trees dropping leaves after creating lovely fall foliage.

  13. Autumn Leaves and Fall Colors - Why do autumn leaves change …

  14. Why autumn leaves change colour and fall off - Woodland Trust

  15. Autumn Leaves Falling/Blowing From Trees on a Windy Fall Day

  16. Autumn Leaves Are Falling Down - Nursery Rhymes

  17. Autumn Leaves Are A-Falling Lyrics - Child Song Lyrics - Lyrics …

  18. Autumn Leaves Are Falling Song Lyrics - Songs for Teaching

  19. 10 Classic Autumn Poems Everyone Should Read

  20. Autumn Song by W H Auden - Famous poems, famous poets

  21. 26 Top Places to See Fall Foliage in the U.S. in 2024 - U.S.

  22. 6,572 Autumn Leaves Falling - Getty Images

  23. Autumn landscape background. Fall park with a lake and benches.