What are Color Changing Evergreen Trees?
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Color changing evergreen trees are those that exhibit a shift in their foliage color, typically during the colder months, despite retaining their leaves or needles year-round. Unlike deciduous trees that lose their leaves completely, these evergreens undergo a transformation where their typical green hues give way to shades of purple, red, bronze, or even orange. This change is a natural response to environmental factors, primarily temperature fluctuations and decreased sunlight, and is not usually a sign of disease or distress. It’s a fascinating adaptation that allows these trees to survive and thrive through harsh winters. While many people associate evergreens with static green foliage, certain species display these beautiful seasonal variations, adding another dimension to the winter landscape. The change in color is a result of altered pigments within the leaves or needles, often triggered by cooler temperatures. This phenomenon primarily involves the breakdown of chlorophyll, the green pigment, which reveals other pigments that were previously masked.
Why Do Some Evergreens Change Color?
The key to understanding color changes in evergreens lies in the pigments within their foliage. While chlorophyll gives the characteristic green color, other pigments like anthocyanins (red and purple) and carotenoids (orange and yellow) are also present. These other pigments become visible as chlorophyll breaks down during colder temperatures. Additionally, some color changes are due to an increased concentration of certain protective pigments as a response to cold weather. This acts as a kind of antifreeze for the tree, preventing damage and allowing it to continue photosynthesis, albeit at a reduced rate, even in the winter.
Examples of Color-Changing Evergreens
Several types of evergreens display notable color changes during winter. Here are a few prominent examples:
- Andorra Juniper: This conifer is known to develop a purplish or bronze tint during the colder months.
- Pieris: This broadleaf evergreen often displays purplish winter hues.
- Rhododendron P.J.M.: Certain Rhododendron varieties, like P.J.M., are known for their purplish foliage in the winter.
- Hinodegiri Azalea: This broadleaf evergreen azalea displays a purplish color during winter.
- Arborvitae (Thuja) and Boxwood (Buxus): These common evergreens may also exhibit color changes as temperatures drop.
- Eastern Red Cedars: Often show purplish-brown color changes in winter.
- Scotch Pines: While their needles may not change dramatically, their bark takes on a distinctive cinnamon orange color, and their needles can have a bluish-green appearance.
Winter Color Changes vs. Distress
It’s important to distinguish between normal winter color changes and those caused by stress or disease. Healthy color changes are uniform across the plant and appear as a natural shift in color, typically during the cooler months. On the other hand, distress-related discoloration is often patchy or uneven, accompanied by signs like wilting, browning of needles or leaves, or pest infestation. Conditions like winter desiccation or “winterburn”, cause the needles to appear orange, brown, or purple and can occur due to inadequate water. It is crucial to ensure your trees receive adequate watering, especially before the ground freezes.
Frequently Asked Questions (FAQs) About Color Changing Evergreens
1. Do all evergreen trees change color in winter?
No, not all evergreen trees change color. Many remain green year-round. However, some species have evolved to alter their foliage color as a natural response to winter temperatures.
2. Are color changes in evergreens a sign of the tree dying?
Not usually. Most color changes are a natural response to cold weather and are not indicative of a health problem, such as a pathogen or disease. However, excessive browning or patchy discoloration might indicate a different problem.
3. What pigments cause color change in evergreen leaves?
The breakdown of chlorophyll reveals other pigments such as anthocyanins (red, purple) and carotenoids (orange, yellow) that were present in the leaf all along.
4. How do evergreen needles survive winter?
Evergreens have needle-like leaves with a waxy coating that helps them conserve water and prevent freezing. They also reduce the water content in their leaves or needles.
5. Do evergreen trees need sunlight in winter?
Yes, most evergreens require full sun even in winter, so they should still receive at least six to eight hours of direct sun for photosynthesis.
6. Why do some evergreens turn yellow?
Yellowing in evergreens can be due to several factors such as normal shedding of older leaves, nutrient deficiency, or sometimes environmental stress.
7. Do evergreen trees photosynthesize in the winter?
Yes, unlike deciduous trees that shut down photosynthesis, evergreen trees can continue this process, albeit at a reduced rate during winter. They do not have to rebuild their chlorophyll like deciduous trees do in spring.
8. What is “winterburn” in evergreen trees?
“Winterburn” or winter desiccation is the discoloration and damage of needles due to cold, drying winds, often turning the needles orange, brown, or purple.
9. What is the difference between deciduous and evergreen trees?
Deciduous trees lose all their leaves annually, while evergreen trees retain their leaves or needles throughout the year.
10. Can evergreen trees get “too cold?”
While they are adapted to colder temperatures, extremely cold temperatures or significant temperature fluctuations can cause damage.
11. Should you water evergreen trees in winter?
Yes, especially newly planted evergreens. Ensure ample water in the root systems as they enter winter.
12. Do all evergreens have needles?
No, most conifers (like pines and firs) have needles, but some broad-leafed evergreens also exist (like holly) that also maintain foliage year-round.
13. Are all conifers evergreens?
Most conifers are evergreens, but there are exceptions, like the tamarack or larch which is a deciduous conifer that changes to yellow.
14. How long do evergreen needles last?
Evergreen needles typically last for two to three years before falling off and being replaced.
15. What is the significance of the color green in evergreens?
The green color in evergreens is due to chlorophyll, which is crucial for photosynthesis, allowing the tree to convert light energy into sugars for growth and survival.