Why you shouldn’t grow Callery/Bradford Pear Trees

invasive Callery Bradford Pear Tree

Every April on my drive home from work, most trees still haven’t budded out.  But at the same time I do see many other trees that are covered in white flowers.  I see them in the edge of forests and wild areas.  I see them in ditches and drainage areas, along fence lines.

And I see them in nearly every subdivision.

Callery pear tree in suburbs 1
Every single neighborhood or development has these horrible invasive trees….

These white flowered weeds are commonly known as the “Bradford Pear” (Pyrus calleryana).  They were introduced by landscape designers in the 1960’s, and often used in urban landscaping.  Planting them along streets, and residential landscapers also sold them to new home buyers as a flowering tree.

Why the Callery / Bradford Flowering Pear Tree is harmful for the environment and potentially damaging to your property

The Callery Pear Tree is very harmful in the following ways

  • It displaces native trees and plants in the wild, and can form dense colonies
  • The growth rate is faster than native trees, thereby slowing or preventing their growth
  • It leafs out before woodland wildflowers emerge from dormancy, robbing them of critical sunlight and preventing their growth. This can also harm certain pollinators that use these plants as their larval host
  • The structure of the tree and brittleness of the wood make it prone to falling limbs that can damage people or property

Now I will go into more detail to each of these bullet points to expand upon them, and provide you the detailed reasoning as to why you should not use this tree in your landscaping.

invasive bradford pear trees escaped
More naturalized Callery Pear Trees. This location is approximately 300 yards from the nearest subdivision.

Why has Callery Pear Trees become so prolific?

Well, they are a flowering tree.  Beautiful flowers.  A Bradford Pear tree in full bloom looks gorgeous.  It also looks a bit strange though, as pretty much all other trees have no leave or even buds while the Bradford Pear Tree is a tall bastion of white blooms.

bradford pear tree bloom
Close up of the flowers

These trees can tolerate almost any environmental conditions and grow very fast, reaching 15′ (5m) in just 5 years or so.  With a max height of roughly 30′ (10m).  Also, they have a nice round or egg-like shape to them, which can be attractive for residential yards and landscaping.

Callery pear tree in suburbs 3
There was a second tree about 20 yards behind this one, happily growing in the woods.

An invasive tree

The first Callery Pears were imported into California in the early 1900’s.  Seeds were brought in to determine if a suitable cultivar could be developed that would be resistant to Fire Blight, that was decimating the pear crop of California.  These seeds came from a variety of trees in China, giving it a large amount of genetic diversity.

invasive callery pear trees
Some ‘escaped’ Callery or Bradford Pear Trees. These trees will grow faster than most native specimens.

In the 1960’s, a cultivar known as the Bradford was developed (in Maryland).  The Bradford Pear trees were initially planted/sold with the promise of them being ‘sterile’.  So people planted these trees thinking they would not reproduce.  But nurseries have been making their own cultivars for some time, cross pollination regularly occurs.  However, it has been shown (and I observe it each Spring) that the trees can cross-pollinate with other species.  Meaning these small little pears that are produced in the fall, are actually viable seeds.  Well, the birds will eventually eat them and spread the seeds in a natural way, leading to many new saplings in the Spring.

Grafted varieties can revert to the mother species

Trees that are grafted with ‘hybridized’, sterile varieties may produce the ‘sterile’ fruits.  Those fruits will become viable seeds through cross pollination.  Since these are hybrids, these seeds will produce one of two things – the original Callery Pear tree from China, or what ever it cross pollinated with.  The true Callery Pear from China is even worse than these ‘Bradford’ varieties.  The Chinese Native version produces thorns that can get up to 4″ long, similar to a Honey Locust.  These thorns can injure people, animals, and puncture tires.  Additionally they can form dense thickets, and make land less desirable for people AND wildlife.

An invader from another land

The main reason this tree blooms before Oaks and Maples have full buds is because it isn’t from North America.  The Bradford Pear tree is native to China, and has evolved in a completely different ecosystem.  So it doesn’t take many warm days after winter before the tree ‘wakes’ up from its Winter slumber and thinks it is time to put leaves out.

escaped callery pear tree
Note that the Callery Pear Tree in this picture is in full bloom. While the native trees next to it have barely formed any buds.

Hardy and Robust

These trees are extremely adaptable.  They can grow just fine in moist conditions, drought, sandy soil, clay – and a large range of ph levels.

Why is leafing out early a problem?

The Bradford Pear tree going into full foliage so early in Spring causes problems for other native species.  The shade created from the flowers, and then soon followed by the leaves takes the sunlight away from the other plants on the forest floor, and other trees that are smaller.  This is a large issue for our native trees.  Now, it doesn’t effect native trees that are taller than the fast growing Bradford Pears, but it does reduce the growth rate of native saplings.

bradford pear trees in wild
More escaped Callery/Bradford Pear Trees. This location is about 200 yards from a relatively new subdivision.

The longer that Oak, Maple, and other native trees are small saplings, the more prone they are to being browsed/eaten by deer.  So, it becomes difficult for a piece of land to grow the normal species that have evolved within our ecosystem.  Sure, the deer must get some nutrition from eating a young oak sapling.  But they would get more food in the long run if that Oak sapling was able to grow to maturity and produce acorns!  Too bad we can’t make the deer understand that fact.

Not just a problem for other native trees

The sunlight ‘stolen’ by the earlier-than-native foliage of the Bradford Pear tree effects our woodland wildflower population.  Virginia Bluebells, Spring Beauty, Trout Lily, Blood Root – all early Spring woodland wildflowers.  These flowers are a valuable source of nectar to bees and other native pollinators.

Early Spring woodland flowers emerge from dormancy and are generally blooming before trees have put out leaves.  They have evolved to grow in this manner because they need to get the sunlight before the Oaks, Hickory, Maples and other trees put out leaves and shade the forest floor.  Bradford Pear trees rob these plants of their necessary sunlight by putting out foliage before some of these plants even emerge.  Dense colonies of the Callery Pear trees form on woodland edges, preventing native trees, and thus other woodland or native partial shade plants.  So, it is a detriment to our native bees and butterflies that don’t have many nectar options in the early Spring.

Falling Limbs

steep callery bradford pear tree branch structure
Callery / Bradford pear tree branch structure. Note the steep angle the limbs make, relative to the wide shape of the tree.

Bradford Pear trees have a very steep branch structure.  The wood is also noted for being quite brittle.  This combination makes the limbs inherently weak and at risk for falling during high winds or storms.  This can pose a serious threat to people and property.  Some municipalities have banned or are removing it from city landscaping just to avoid any liability.

Once the tree is full grown, the crotch of the branch/trunk has trouble supporting the weight of the limbs.

Some states have listed it as an invasive species (Alabama, Georgia, New Jersey, Maryland, North Carolina, and Pennsylvania).  This is due to is prolific nature, as it has the ability to form thick stands of trees on the edge of natural forests – and thus preventing our normal, native plants from growing.

But the falling limbs from mature trees can be a real issue.  Imagine if a limb fell onto your car, or worse yet, a person!  That is too steep of a price to pay just to have a flowering tree in your yard.

Storm damage to a Bradford Pear Tree. The brittle nature of the wood of this tree, coupled with the branch structure make it prone to dropping limbs in high winds. Credit: Famartin [CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0)]

Native Alternatives to Callery Pear Trees

There are many different native trees that are perfect for landscaping that produce lovely Spring Flowers.

  • Eastern Redbud is a gorgeous pink flowering tree that gets 20-30′ tall, with a 25′ spread.  This tree produces nectar for pollinators, just as the Bradford Pear does.  But it will flower and leaf out a bit later, so not impacting woodland wildflowers.

    eastern red bud tree in yard
    The Eastern Redbud Tree flowers about 1-2 weeks after the Pear Trees. Gorgeous pink/purple blooms are edible, and help pollinators.
  • Service Berry is a white-flowering tree/shrub that can get about 20′ tall.  This tree flowers early in the Spring, and produces service berries!  They are edible to both human and wildlife.  So, it achieves the same goals of the Callery Pear, but without the negative environmental implications.

 

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