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Tree, Shrub & Landscaping News

Pinnacle Assurance Circle of Safety Award

American Arbor Care named a Circle of Safety Winner for 2019!!!

By Heather Vigil - January 22, 2020

American Arbor Care is honored and proud to be one of just 50 of Pinnacol’s customers to receive the 2019 Circle of Safety Award. Our employees are like family, so keeping them safe on the job will always be our top priority.

American Arbor places workplace safety at the top of our priority list.  From providing new equipment to the safety supplies to the vehicles, all are chosen for the safety they offer our employees that service our clientele on a daily basis.  

Through training, maintenance, risk control and claims management we are able to provide all of the pieces to the puzzle to ensure our employees stay healthy and productive.

Our clients can also be proud to know they are hiring a professional company that has a strong set of safety values.

Japanese Beetles Your Tree Service Company in Denver Can Eliminate

April 25, 2018

After spending much time, energy, and valued dollars on your lawn and landscaping, it can be incredibly frustrating when it is ruined by unwanted pests. In Denver, there are a variety of pests that can harm your lawn that you will need to get rid of to maintain its look. By taking a few steps and working with your local tree service company in Denver, you can eliminate these problems. One such pest that causes headaches for homeowners and landscapers alike is the invasive species, the Japanese beetle.

First encountered in the early 20th century in a small New Jersey town, the japanese beetle is a pest to all states East of the Mississippi and even a few to the West. With an almost all encompassing appetite the grubs and the beetle feed on more than 300 agricultural and ornamental plants. Known as one of the most destructive insects to grass and plants alike, the larva and beetle can damage your lawn immensely.

Costly to combat, and extremely destructive, investing into an experienced Denver landscaping company can ease the stress you experience and get rid of the pests reeking havoc on your trees, plants and grass.

Japanese Beetles

Japanese beetles are small beetles that are typically a metallic green and blue color, with a cooper orange back. They can resemble other beetles, but an easy identifier for a Japanese beetle is the presence of two rear white tufts and five white tufts located on its side.  While they might look pretty, they can do a lot of damage to your lawn as they feed on plants in groups.

They especially are attracted to pollinating flowers and plants and because they work in groups, can demolish leaves, as they eat around the veins of the leaves, stripping them down and rendering them useless. You will notice this when your leaves begin to have holes in them, or disappear leaving only their veins. You can help to avoid this issue by working with your tree and landscaping company on properly fertilizing the ground and treating the area with insecticides.

White Grubs

Japanese beetles start off as white grubs in the ground. It is considered that an infestation of seven to fifteen grubs per square feet can cause significant damage to the surrounding plant life. In the grub stage, the pest feeds upon the roots of plants in their feeding area. One way to identify if there might be an infestation of Japanese beetle grubs is by identifying the areas of your lawn that show signs of browning or patches of grass that have died.

Usually the beatles will lay eggs in early summer at which point the larval stage of the beetle will emerge after approximately two weeks. While the larva feed on the finer roots, the emerging grub stage is where they attack the more robust parts of the root system. They hibernate during the winter, and will emerge as adults four to six weeks after the beginning of spring. Most of its life is spent in the larval stage, but the 30-45 days it spends as an adult can cause an extreme amount of damage to your landscape.

After they are born, they usually do a lot of their damage in early fall, so it is important to keep an eye on warning signs such as brown or dying grass. You will want to eliminate this problem before winter, otherwise you will have a larger issue on your hands come next spring.

Care Tips

As we move closer and closer to the summer months, it is important to properly care for your lawn before any pests may have a chance to lay eggs or further damage your property.

If you are using pheromone traps to try to control your Japanese beetle population, you may be causing more damage than you realize. Traps have been researched and the findings conclude that the device attracts more beetles to the surrounding area rather than eradicating the pest. Other ways of reducing the population include natural repellents such as catnip, chives, tansy and garlic, but have been noted to have a limited effect on the beetle population.

If caught early enough, your landscaper could find an adequate means of getting your pest problem under control. One such way is through a biological control. A specific bacteria is known to cause milky spore disease in the larva of Japanese beetles and can be administered in standard, low density across a broad area, treatments. It’s not an immediate way of ridding your lawn of grubs, and may take several years before your landscape is completely free of eggs and larva.


In order to truly fight against one of the most destructive pests known in the area, you need the expertise of dedicated landscapers and arborists. You can get consulted on which plants are not susceptible to the beetle, and can identify an infestation and advise on a strong course of action to rid your landscape of the pest and ensure they don’t come back.

Insecticides applied from April to mid-June can target those recently emerged grubs and get them when they are starting to feed as the days get warmer.  There are granular and liquid optionsf or the treatment of japanese beetle.  While this may seem likely to get rid of your infestation, the larva at these stage are large and difficult to kill, so adult may emerge regardless of insecticide application. Consulting with an experienced landscaper can help you set a game plan for properly combating the Japanese beetle population in your lawn, trees and plants.  While we may never be able to eradicate the insect, a program may be set up as part of an IPM (Integrated Pest Management) plan to maintain the populations below a damaging threshhold. 

When trying to combat Japanese beetles, white grubs, and preparing your landscaping for the summer, American Arbor Care has you covered. Experienced with pest control and creating beautiful landscaping, the team at American Arbor Care can ensure your landscapes health and give you a lawn you’ll be proud of! As you prepare to make your plans, check out our American Arbor Care special offers. To get started, contact us at 303-639-8584. We can assess any damage done by unwanted pests and help ensure your investment lasts for years to come!

Early Spring Grass Cutting and Rose Pruning in Denver Landscaping

March 28, 2018

As the warmth of spring begins to spread across the region new growth begins. Plants, shrubs, and trees that have been dormant all winter are awakening with renewed life for another growing season. Plants and grasses around your home or office can help to brighten the landscape but proper care is needed, especially at such a critical time.

While tree trimming needs are typically accomplished in the fall and winter months as trees enter their dormant state, the spring requires specific attention in an effort to ensure your lawn and garden flourish over the coming months.

These details extend to weed control, proper watering, formulating a plan for what you wish to accomplish and also cover early grass cutting and pruning of particular plants, especially roses. These decorative plants are often the highlight of a landscape and depending on the variety, can help to establish a color scheme for a landscape or set apart one landscape from the next.

Along with roses, ornamental grasses are also an important component in greenery often used to create borders, follow paths, or outline boundaries of a particular landscape. These grasses, like most every other plant, tree, or shrub in the spring will begin to grow as the rains fall and weather warms. Needing to control their growth and monitor your desired effect of them inside a landscape, spring presents a perfect opportunity for cutting to assist in setting a tone for the upcoming season.  Oftentimes the tops of the ornamental grasses are left intact over the winter as it does provide some winter interest for the landscape.  Additionaly, the tops are left on the ornamental grass plants as it aids in the preservation and sustainability of plant's root system over the winter months as protection mechanism.


There are many benefits to pruning rose bushes and also reasons for which it needs to take place. Depending on where your roses are located and how big or small you desire the plant to be can often be controlled with proper pruning.  Over the winter months roses die from the top down.  It is recommended that roses that are leggy at the branch ends, or droopy be minimally cut back to prevent breakage during heavy snow storms.  Additional pruning in the fall is not necessary or recommended.  Typically, in late March to early April the rose buds will begin to plump up is the perfect time to trim the deadwood out of roses.  If a stem is partially alive the dead tissue may be removed back to a healthy, live bud.  If rose bush as become messy and over-grown, this time of year is optimal for cutting the rose bush back to within 4-6" of the ground.  The stored energy in the root system will result in new growth for the current season. 

While it is often touted that little damage can be done to a rose bush by improper pruning, leaving the task to professionals is the best bet to achieve your desired results. While pruning can be used to eliminate dead portions of the plant, which can be easy to spot and remove, cutting healthy areas to maintain size and promote new growth requires specific attention to detail and precision execution to achieve wanted results.

Cuts can limit the amount of blooms which occur each year and specifically if roses are pruned during the wrong growing phase it can hurt how the plant progresses as the weather warms and new growth begins. These cuts should be utilized using appropriate tools that have been recently sharpened in order to ensure no damage to the plants occurs while pruning. A dull pair of tools used for cutting could lead to ragged cuts which are not healthy and will not promote proper growth during the spring of the year. Many roses re-bloom on a six week blooming cycle.  It is important to remember to provide proper fertilization to the roses bushes throughout the season.

Other benefits of pruning include allowing more light to reach the plant in addition to improving the circulation around the rose bush. These results from proper pruning also help to ensure a healthy plant with plenty of blooms to enhance landscape appearances around your home or office.

In order to keep roses from becoming vulnerable to the harsh winters and frost conditions of Colorado, pruning should occur at a specific time. Pruning roses should normally take place two weeks prior the last hard frost for the most success. In Colorado, the final frost typically occurs around May 10 indicating that cutting should take place toward the middle or end of April.  If you would like further information on rose care please click on the link provided for the Denver Rose Society.  


Another component which can benefit your landscape is to also begin cutting all ornamental grasses in an effort to prepare for the growing season and spring of the year. These grasses need to be cut in a similar fashion as rose bushes for many of the same beneficial reasons.

While ornamental grasses serve multiple purposes such as creating borders or being used to add depth and feeling to a landscape, they too must be cared for regularly. These timed cuttings can also inhibit their growth, which helps to maintain a clean and well manicured landscape with multiple benefits to the home or business owner.

Examples of specific plants and shrubs which will benefit from a pre-spring cutting include each of the following adding interest to your lawn with ornamental grasses: desert plains fountain grass, Mexican feather grass, blue oat grass, prairie dropseed, pampas grass, giant reed grass, feath reed grass, and others. These need to be maintained for many of the same reasons associated with pruning roses in the spring of the year.

Ornamental grasses not only add texture to your landscape but can also be of benefit in dealing with surrounding wildlife. Deer often cause harm to many plants and grasses used to make a landscape flourish but many of the ornamental grasses used for textured purposes are resilient and lack the appeal to wildlife. For this reason, these grasses are often used and when properly maintained can create years of continuous enjoyment within a garden or particular landscape.

Final ornamental grass tips to include knowing whether the grasses planted within your landscape are warm or cool season grasses at . While the maintenance of each is important and somewhat similar, the pruning periods differ for both. Typically, a third of the prior seasons growth should be cut back in order to promote new growth and keep the ornamental grasses sufficiently producing their desired component toward the overall look of your landscape.

If you’re landscape is in need of pruning and seasonal cutting then consider contacting an expert with the proven history of satisfied customers and a portfolio of completed projects (available for reference). Let the certified professional arborists at American Arbor Care assist you today. Their highly trained staff can help with any and all of your landscape needs in addition to offering tree trimming and debris removal services. The qualified experts at AAC also offer a variety of irrigation services which can be applied or installed within your lawn as needed. With spring is on the horizon, AAC is also currently offering a price special on all of their pruning services, which runs through the end of March and can help both your wallet and landscape at the same time. The experts at American Arbor Care have been proudly serving the Denver area for over 20 years and can set you up with an appointment or free estimate for pruning or any of their other excellent services. Contact us today online or call 303-639-8584 to get started right away!

Denver Tree Service Offering Winter Pruning Discount

February 28, 2018

There is no better time than the present to have your trees and shrubs pruning needs addressed for the upcoming growing season. When trees are dormant, during the winter months, the pruning is easier and less impactful on the overall health of trees or shrubs. The Denver area landscape does have certain tree species that require pruning work be completed in the winter months, due to the risk of disease. Workers are able to easily access the trees when pruning during the winter months, and defects in a tree are readily detected.  Structure pruning will lend to the promotion of branch integrity for the future of the tree, as well as an important to start for proper development when trees are young.  Pruning during the winter months prior to flowering and leafing is ideal, prior to our spring storms that can result in storm damage, if a tree has not been properly pruned.

As the calendar continues to turn and days pass one after another, the winter weather will eventually dissipate as temperatures begin to increase. Rising soil and ambient temperatures aid trees in breaking dormancy to start the process of leaf emergence and flowering.  If you are interesting in receiving a free estimate for pruning while we are still offering our 10% winter pruning discount please contact our office (discount is valid for residential properties until March 31, 2018).

There are a variety of reasons that make winter when to trim trees and shrubs, including each of the following:

Tree Damage and Wounds

Pruning trees during the winter months has less impact on trees and shrubs than during the spring season. Pruning during flowering and leafing times can be stressful on trees and shrubs, as they are in the process of growing.  Pruning during the winter months also results in the stimulation of growth. Pruning during the winter months promotes wound compartmentalization prior to the spring, when insects and diseases are active. Further, our trained staff can easily identify dead, diseased, or broken branches when compared side-by-side with healthy, growing tissue.  Many trees in the Denver area have very obvious and prominent buds during winter months.  The dead, broken, or diseased branches pose potential fall hazards and should be removed immediately for the safety of those on the ground, as well as the overall health of the tree.  Dead branches in trees that are over 2" in diameter are easily blown out of trees during high wind storms.

Lessen the Risk of Disease or Infestation

American Elms, ornamental, and fruting trees are recommended to have pruning operations completed during the winter (dormant) months. Please find more information below regarding the diseases the afore mentioned trees are susceptible to.  Just as humans can be susceptible to certain disease in different stages of their lives, so too are trees in their particular life cycle. By waiting until the later winter months, both risks are inherently lessened with the cooler temperatures and relative non-existence of any disease and pest infestation.

Less Sap Flowing

As the trees evolve during the seasons, when completing dormant pruning there is  sap flowing freely, because trees have less need for the uptake of water and nutrients since they are not actively growing.  Increased amounts of sap levels will not only attract insects and wildlife, but could also become a mess and difficult to clean for  homeowners dealing with such a tree. While it is not unusual for certain species of trees and shrubs to have an increased flow of sap during the spring months, it also not an optimal time for pruning.

Sight Lines are Dramatically Improved

Pruning during the winter months while the tree does not have a full canopy of leaves is actually preferred by most climbers, as it allows for better, unobstructed views.  It allows better identification of areas in need of attention and easier access for the necessary equipment and the crews.

Fire Blight

One such disease which is prevalent in ornamental and fruit trees attacking the foliage in the spring, is fire blight. This often exceptionally destructive disease can be limited with appropriate levels of pruning and maintaining a tree’s overall health. It is a very active disease for the Denver area during the spring.  Each spring season and the amount of damage varies.  Denver tree specialists best recommendations for the management of fireblight includes winter pruning to remove the diseased tissue and a spring application to aid in the prevention of the disease.

American Elm

These trees are very vulnerable to a pest infestation vectoring a disease the will result in over-all decline and eventually death if pruning is performed during the growing season. The attraction of pests like the elm bark beetle increase after pruning if the work is completed during the growing season.  However, if the pruning is performed during the dormant season, this can be avoided altogether . Any steps which can be taken to limit the possibility of a pests infestation or causing increased and unwarranted damage to the tree is always recommended.

These are just a few of the highlights to why winter a great time to prune trees. Proper pruning and the development of a care plan will provide your Denver Landscape with the most benefits, critical to the over-all health of your landscape, while also protecting the investimate you have. While these tips are only the beginning, they help to set a roadmap of future pruning expectations and can assist your trees to live full, healthy lives. All while providing the beauty, shade, and potentially foods for many years to come.

If you’re trees are in need of pruning or perhaps you wish to have a professional check the property for all the amazing advantages of executing a pruning plan, let the certified professional arborists at American Arbor Care assist you today. They can help with any and all of your tree trimming and debris removal needs, in addition to offering stump grinding and a variety of irrigation services. As the winter months continue, AAC is currently offering a price special on all of their pruning services, which runs through the end of March and can help both your wallet and landscape at the same time. The experts at American Arbor Care have been proudly serving the Denver area for over 20 years and can set you up with an appointment or free estimate for pruning or any of their other excellent services. Contact us today online or call 303-639-8584 to get started right away!

Caring for Your Evergreen Trees and Landscaping in Denver this Winter

January 3, 2018

While the leaves may have fallen off the other trees in your yard, your evergreens will be flourishing. Such a wintertime staple, the evergreen is the perfect tree for the season. They can last all year long, especially during droughts and harsh conditions. By properly caring for them during the winter, your evergreens will keep up their beauty and luster. Now that we’re entering into the winter months, make sure you care for your evergreens and other landscaping in Denver. It’s also important to know when to call in experts too that can help your lawn stay beautiful.

Evergreen Maintenance

During the winter, evergreens can be susceptible to winter burn. This is when the tips of their needles turn red or brown, or just fall off altogether. It occurs for a variety of reasons—one due to the large temperature dips in the evening, leaving the tips to freeze. Another reason is because of photosynthesis. Evergreens will gather energy then release water. If unable to replace that water due to the ground freezing, winter burn can occur. To help avoid this, you can water your evergreens in the winter. It also helps to wrap them. By reviewing the guide “Winter Tree Care in Denver: Trunk Wrapping,” you can learn why this method will help all of your trees and shrubs. It also helps to keep your evergreen trees in areas of the yard with a full range of sunlight.

As the winter months roll by, monitor the health of your evergreen trees. If evergreens are negatively impacted by the drop-in temperatures, you may notice cracks in the bark and other areas of the tree. This is an issue wrapping the tree can fix (if the evergreens are small).  You can discuss with your neighborhood arborist to see if you need to take any additional precautions. Also, while dehydration is not as likely in evergreens during the winter, it can happen. Over the winter, watch the color of the trees. If you have used a synthetic mulch, it can be the root of the problem because it prevents water from penetrating the mulch and into the soil. Make sure to use an organic mulch in the future. Last, you may also notice damage due to critters in your yard. If you find there is damage, invest in repellents to prevent further damage.

Additional Winter Maintenance

Denver is home to cool season grass, which is a type that can handle freezing temperatures, as well as warm ones. To aid in their vitality, you must fertilize your soil before the first freeze of the season. To also help your lawn, keep debris such as leaves or twigs, lawn tools, or other items from sitting atop the grass for too long. This includes parking vehicles in the lawn that can damage the grass. If you have plants outdoors, potted plants should be in larger containers. You also need to continue to give them water. For these and other planted shrubs, bushes, and more, make sure to wrap them just like you have for your evergreen trees. This will serve as an insulator to help retain heat and protect them from the elements. Watering of your lawns on warm days will also reduce the amount of spider mite activity in full-sun, sloped areas. (Don't forget to water your trees/shrubs/perennials too!)

For your evergreens and other trees in your lawn, consider adding an anti-desiccant to them. This is a spray for their leaves that will help them retain water as the temperatures drop.

It is also important to monitor your lawn in the late winter to early spring for snow mold. As the snow melts, this problem can occur, causing you to see a grey or pink mold in your grass. Each are different and have negative effects on your lawn. If you find this in your yard, be sure to work with your local landscaping company to restore it back to life.

Spring Preparation

Throughout the winter months, make sure you have your checklist ready for spring to keep your evergreen trees healthy. In March and early April, examine your trees to see if any of their needles are browning, or if the tree looks distressed in any way. To help bring them back to life, they must receive fertilizer. While organic fertilizers are best for evergreen trees, you can work with your local arborist to find the perfect fertilizer. You can add fertilizer anytime through the summer, but ideally, the sooner the better. Aim to have your evergreens fertilized by the beginning of April. Ask your local arborist if a deep root fertilization is best for your trees. This type of fertilization places the fertilizer deep within the ground, ensuring it gets to the roots of the tree. Trunk injections can also be applied to help with nutrition, as well as combat disease and insects.

You will also need to add pruning to your spring checklist. When you inspect your tree after the winter  look for any dying or diseased areas. Damaged branches will need to be pruned. Prune using a thinning method to remove the dead or injured areas. Make sure you do not prune all the way to the center of the branch as it can hinder future growth. A guide to successful pruning, pruning evergreen trees will help you learn the best technique to encourage growth.

Calling in the Experts

If you are experiencing your first winter in a new house with evergreens, or are looking for ways to ensure your plants make it through the winter, calling on an expert will help. An arborist will look at your current situation and tell you of any warning signs or areas to improve upon. From there, they will provide you with the tasks that need to be done, as well as areas they can work through to keep your trees and plants healthy. This is a great asset for the overall value of your home.

For an expert you can trust to make sure your evergreens and plants survive this winter, contact American Arbor Care. We have been a trusted source for tree care in Denver for over 20 years. From lawn care and landscaping, to trees and shrub pruning, we have you covered. Call us today at 303-639-8584 or email us at to see how we can help.