Red autumn maple leaves
Autumn is one of the most beautiful times of year in southeastern Pennsylvania. Trees turn brilliant shades of red, orange, and gold, ornamental grasses catch the afternoon sunlight, and familiar gardens take on an entirely new appearance.
But have you ever wondered why leaves change color in the fall? Or how you can bring more of that seasonal beauty into your own landscape?
The answer lies in a combination of plant biology, changing weather, and thoughtful landscape design. Fall is also a wonderful reminder of everything plants do for us throughout the year, from supporting pollinators and wildlife to improving our outdoor spaces.
At Naturescapes, we believe a beautiful landscape should offer something to appreciate in every season. Here is a closer look at the science behind fall color and how to create an outdoor space that continues to shine as the growing season winds down.
Why Do Leaves Change Color in the Fall?
During spring and summer, most deciduous trees and shrubs produce chlorophyll, the pigment responsible for their green leaves. Chlorophyll allows plants to capture sunlight and use that energy to produce sugars through photosynthesis.
As autumn approaches, days become shorter and nights become longer. These changes signal that the growing season is ending. Trees begin breaking down chlorophyll and recovering nutrients from their leaves before winter dormancy.
As the green pigment fades, other colors become visible. Depending on the plant species, those colors may include brilliant yellows, warm oranges, deep reds, and purples.
Eventually, a separation layer forms at the base of each leaf stem, allowing the leaf to fall. This process helps many deciduous trees conserve resources and prepare for winter.
In other words, the spectacular colors we enjoy each autumn are part of a natural seasonal transition that helps plants prepare for the months ahead.
What Causes Red, Orange, and Yellow Fall Leaves?
Have you ever noticed that one tree turns bright red while another nearby becomes golden yellow? Different plant pigments are responsible for these colors.
Yellow and orange leaves
Carotenoids are pigments that are present in leaves throughout the growing season. During summer, chlorophyll masks their yellow and orange colors. As chlorophyll breaks down in autumn, these warmer tones become visible.
Red and purple leaves
Anthocyanins produce many of the red, crimson, and purple colors associated with fall foliage. Unlike carotenoids, these pigments are often produced in leaves during autumn. Bright sunlight and sugars remaining in the leaves can help encourage their development.
Brown and bronze leaves
Some trees, including many oaks, develop attractive russet, bronze, and brown tones as their leaves age. These colors contribute their own richness to the autumn landscape.
Every tree species has its own characteristic color palette. This natural variety is one reason a landscape with several different kinds of trees and shrubs can be so visually interesting in the fall.
How Weather Affects Fall Foliage
Although shorter days help trigger the seasonal transition, weather plays an important role in determining how vibrant fall foliage becomes.
A healthy growing season with adequate moisture, followed by sunny autumn days and cool nights, often creates favorable conditions for brilliant fall color.
However, every year is different.
- Sunlight: Bright days can encourage the production of red-producing anthocyanins in some plants.
- Cool nights: Cool, but not severely damaging, temperatures can favor the development of vivid red and purple hues.
- Summer rainfall: Adequate moisture helps trees maintain healthy foliage throughout the growing season.
- Drought: Severe water stress can cause leaves to turn brown, change color prematurely, or fall earlier than usual.
- Early frost and strong winds: These conditions can damage foliage and shorten the period when fall colors are visible.
This is why autumn does not look exactly the same every year. Even in a less colorful season, different species can provide a beautiful mix of foliage, berries, ornamental grasses, and interesting plant forms.
Which Trees and Shrubs Have the Best Fall Color in Pennsylvania?
If you want to enjoy more autumn color at home, consider the trees and shrubs already growing in your yard as well as those you might add to your landscape.
Here are several plants worth discussing with a landscape professional when planning a garden in southeastern Pennsylvania.
Red Maple
Red maples are known for their brilliant red and scarlet foliage. Their autumn color can make them a striking focal point in a residential landscape when planted where their mature size and growing requirements can be accommodated.
Sugar Maple
Sugar maples are celebrated for their yellow, orange, and red autumn colors. They can provide a dramatic seasonal display and are particularly attractive in landscapes with room for a substantial shade tree.
Sweetgum
Sweetgum trees can produce a mixture of yellow, orange, red, and purple foliage. Their varied colors make them an interesting option for homeowners seeking a diverse autumn palette.
Serviceberry
Serviceberry offers more than spring flowers and seasonal fruit. Many varieties also develop attractive orange-red fall foliage, making this a versatile choice for residential landscapes.
Oakleaf Hydrangea
For homeowners who want autumn interest without relying exclusively on large trees, oakleaf hydrangea is an excellent shrub to consider. Its foliage can develop red, burgundy, and purple tones, while its distinctive flower heads and branching structure provide additional seasonal interest.
Fothergilla
Fothergilla is a deciduous shrub known for its attractive spring flowers and colorful autumn foliage. Depending on the variety and growing conditions, leaves may display shades of yellow, orange, and red.
When selecting plants, remember that fall color varies with the species, cultivar, sunlight, soil conditions, and weather. A plant that thrives in one location may perform differently in another. Choosing plants suited to your property’s conditions is just as important as choosing them for their color.
How to Design a Landscape for Fall Color
A landscape that looks beautiful in autumn does not happen by accident. The most successful designs consider how trees, shrubs, perennials, and grasses will look throughout the year, not just when they are flowering.
Here are a few ways to incorporate more seasonal color into your property.
- Layer trees and shrubs.
- Mix foliage colors and textures.
- Include ornamental grasses
- Consider berries and seed heads.
- Plan for the entire year.
- Incorporate ornamental grasses.
A thoughtful planting plan can make even a relatively small yard feel more dynamic, with something new to notice as the seasons change.
Beyond Leaves: Plants That Add Autumn Interest
Fall color is not limited to red and gold leaves. Some of the most interesting autumn landscapes combine foliage with flowers, ornamental grasses, berries, bark, and evergreen structure. Our team at Naturescapes would love to help you design the fall landscape of your dreams. Schedule your consult today!
