Mark Selivan, Licensed Arborist

Territory and Services:

Mark operates out of SavATree’s Rockville branch in Maryland, providing comprehensive tree, shrub, lawn, tick and deer services to Bethesda, Cabin John, Chevy Chase, Glen Echo and Potomac, MD. Mark and the team not only provide excellent and professional tree, shrub and lawn care services to clients, but also provide the best customer service available in the Maryland suburbs of Washington DC. Some popular services offered to clients in the Chevy Chase area include tree pruning and trimming, tree removal and take downs, shrub trimming, tree and lawn fertilization, lawn and tree disease prevention, diagnosis and treatment, organic lawn care and other organic care options, weed control, lawn seeding, lawn aeration, pest management such as organic mosquito and tick treatments and deer repellents including our DeerTech program. Need an arborist? Look no further than the experts at SavATree. Reach out to the Rockville branch today to schedule a consultation with Mark! 

Email: [email protected]
Phone:(301) 545-1712


Mark has been in the field of Horticulture for over 22 years. Before joining SavATree he was the Director of Grounds and Landscape for Johns Hopkins University.


Mark earned his degree in Philosophy and History with a minor in Botany from Manhattanville College.

Industry Involvement, Awards and Certifications:

  • CT Licensed Arborist
  • MD Licensed Arborist
  • MD Licensed Tree Expert


Mark loves spending time outdoors, learning about history, cooking and spending time with his daughters.

Why He Became An Arborist:

“I became an arborist long ago because I strictly believe it is my duty to protect and enhance the natural heritage around us. ”

Customer Service Philosophy:

“Listen and take the time to put yourself in the customer’s horticultural mission statement.”

What are Mark’s Clients Saying?

“I was very pleased with the timeliness of the response to my first inquiry, the professionalism and care of the estimate and the response to my request to have the work performed very quickly. I am very pleased. Thanks so much.”
L. Harkavy, Bethesda, MD
“Mark is phenomenal and a tremendous asset to your company. We have complete faith in him and don’t hesitate to contact him with our tree and outdoor lawn care needs. We have recommended him to friends and neighbors. The crew is fabulous as well. You guys are the best and we thank you for everything!”
Yvette R., Bethesda, MD
“Mark and the entire crew were knowledgeable, professional and highly skilled. Mark in particular was a subject matter expert and I would definitely hire him again in a heartbeat. I strongly recommend SavATree to anyone looking to hire a professional arborist!”
Aleza P., Bethesda, MD
“This is the tree that shaded my husband’s office upstairs in hot summer months after he became disabled. The cherry tree was his delight. Upon his death, I vowed to keep the tree as long as possible. [The] crew performed a superlative service to my household today. Please extend my deep appreciation to them, to you, and to your company. Best wishes in your service to others and to the plants that keep us healthy and happy.”
Charlotte H.
“I was delighted to have the opportunity to speak to Zach when we was here treating the lawn last week. He is conscientious and passionate about his work. It is a relief to know we are in such good hands!”
Janet A., Derwood, MN

Observations in the Field:

Dangerous Storms Go Hand-in-Hand with the Changing Seasons 


February 20, 2020 – Our environmental experts at SavATree know the climate calamity like the back of their hands. Having a skilled licensed and safety certified arborist in your tool chest is often handy when mother nature decides to act up and deliver a serious present that could ruin your day. Pictured is a 40 in. diameter Red Oak which fell from the adjoining property across the rear side of the home, smashing into a house on the other side. We had the pleasure of rectifying the situation including removing a very large tree which was speared through the sidewall of the ground pool. Safety, planning and professionalism is what you must insist upon dealing with in these extremely hazardous and dangerous situations.

Pine Borer in Potomac, MD

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July 3, 2019 – If you are experiencing ongoing problems with your pine trees, it may be as a result of damage caused by the Pine Borer. This small, but hungry pest can creep up on you and have a devastating effect on your landscape. It is vital to have your landscape evaluated regularly by a certified arborist from SavATree. Our Arbor Patrol program is a great way to make sure your trees, shrubs and lawn thrive all year round. Contact us today to schedule a free consultation!

Beautiful Potomac Lawn

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June 26, 2019 – This is one of our clients’ properties in Potomac, MD. Their lawn is green and beautiful thanks to SavATree’s lawn care program. Not only are our products effective at preventing diseases and keeping lawns healthy, lush and green, but they are also environmentally conscious. Contact us today to schedule a free consultation with a certified arborist. 

Going Jurassic in Bethesda, MD

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May 9, 2019 – Here at SavATree, I take Arbor Patrol very seriously. I do all I can to try to keep your trees and lawn happy and healthy. Sometimes, I have to get creative with problem solving. This is Stan. Stan is a dinosaur that is great for physical and moral support in the garden. Stan, much like me, is focused on rooting out all of the contributing factors that cause issues on your property. Contact SavATree today and maybe I’ll bring Stan along!

What Happens When the Wisteria Blooms?

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May 6, 2019 – These beautiful purple wisteria were spotted on a client’s property in Chevy Chase, MD. When the wisteria blooms in the Bay State, one knows that the aphids are here and feeding. Work against your insect enemies with the private knowledge of an Arbor Patrol Specialist on your property. Do your trees a favor and contact SavATree today!

Trust the Work to the Pros

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May 3, 2019 – I bet you’ve heard and even used this phrase a couple times…”he’s a jack-of-all-trades”. Well, people always forget the end of that famous quote “but he’s a master of none.” You wouldn’t hire a dentist to change the oil in your car, why wouldn’t you call an arborist to professionally prune your landscape investment? This poor pruning job was spotted in Bethesda, MD. Hire a professional. SavATree performs the best tree and shrub pruning in the Washington DC area. Contact us today to schedule your free consultation with a certified arborist!

Past Ambrosia Activity

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April 8, 2019 – Can you find the perpetrator of this destruction in these photos? Look for the two very small holes. The scoundrel, who has destroyed this 60 foot Magnolia Grandiflora in under 5 months, is the Ambrosia Beetle. Every year about this time, all suspect trees should be checked for past ambrosia beetle activity. Results of hidden damage from last season, which may have been missed earlier, could be obvious now. Don’t let this devastation happen on your property. Be sure to ask your SavATree Arborist about invasive species and how they can impact your landscape investment.


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March 8, 2019 – Did you know moss is usually an indicator of several biological conditions in your soil structure? No matter how hard you try to seed and grow grass, if you don’t approach the process correctly, you’ll be forever struggling to get the results you desire. Last year, especially in the Bethesda, Maryland area, I encountered an overabundance of moss growth. This growth was due to the prolonged period of inclement weather, given both higher than above average rainfall and a decreased amount of ambient daylight. Low-lying drainage issues and deep shade areas were also a significant contributor to moss growth. I recommend a program of balanced nutrition achieved though soil testing and the use of gypsum, lime, or both to de-compact soils and adjust pH. In addition, I would consider strategically removing branches from trees to let more sunlight shine on the lawn if shade is an issue. Another alternative could be to begin an aeration program to de-compact the soil and pick a species of grass that will work well in the different areas of the lawn. It takes more than purchasing seed from your local home improvement store to make a perfect lawn. Contact your local SavATree Arborist to learn more about strategies like those above to remove moss and enjoy the lawn of your dreams.

Cold Snaps

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February 7, 2019 – Winter snow loads can weigh down your tree branches and shrubs and can cause breakage.  When winter breakage happens, a trained eye can assess the damage and make repairs with corrective pruning. This can be prevented from happening with a property assessment during the warm seasons. Together we can create a pruning program that will help your trees avoid breakage in the winter and save you the headache! As part of this assessment we can come up with a multi-year or phased approach that fits all needs and budgets because caring for a landscape is an approach not a one-time fix. So enjoy the winter, hunker down, stay warm and know that SavATree is on your side guarding your property throughout all the seasons.

Tree Care and Safety

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December 18, 2018 – One item that should be at the top of the list when hiring a tree company is safety. There are many safety practices that are vital when working on trees. A large marked perimeter and signage set in the work zone is created for both tree team member safety and everyone in the surrounding area. The use of personal protective equipment (PPE): job site hard hats, brightly colored clothing and fully functional, inspected gear is critical, not to mention an established, pre-job briefing protocol. As seen in the photo, we are performing a hazard reduction, canopy inspection, and maintenance pruning on these magnificent, large oaks help to ensure these trees will thrive in the years to come.

American Ash and the Emerald Ash Borer

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December 13, 2018 – This American Ash was a beautiful tree that had shown no signs of infection in June, but in just a few short months, by October, the tree was fully compromised and lifeless all because of a little insect: the Emerald Ash Borer. As a reminder to those who have healthy Ash trees on their property, please have your trees inspected and protected so that we may help this arboricultural American wonder survive. Schedule your complimentary consultation and find out how you can protect your ash trees and other wonderful members of our canopy.


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October 19, 2018 – Sometimes our best intentions to improve our landscape cause unexpected issues. When mulching shrubs and trees, never cover the crown of the plant or bury it in mulch. Doing this creates an anaerobic environment and vectors in pests and pathogens. This photo shows a Boxwood that has fallen prey to Boxwood Blight simply because the perfect conditions for the culturing of the bacteria are present from over mulching.

Ambrosia Beetle Damage

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August 22, 2018 – This season’s unusual rainfall and temperature have interfered with this pesky character’s life cycle and he hasn’t shown up on time, but he is here and he is waiting for an opportunity. There are several species of Ambrosia Beetle with some measuring only 2 to 3 millimeters in length. The female tunnels into trees and excavates chambers where eggs are laid. An Ambrosia Beetle can completely devastate over 100 species of deciduous trees, as shown in this photo of a Dogwood, by burrowing into tree trunks, stems and branches. Speak to your arborist if you have sensitive species on your property.

Lady Bugs

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August 16, 2018 – Work with nature, not against her. If you take a look around and pay attention to the environment, friendly creatures are always lurking and helping you improve your surroundings. Take these beautiful creatures. Did you know that ladybugs help control pests that would otherwise destroy your plants? They have a natural instinct to protect the plants around them and eat many insects that would destroy plants and crops. These ladybugs are often used as biological pest management; providing protection to your garden from parasitic insects and helping reduce the use of harmful pesticides. This is referred to as Integrated Pest Management (IPM) programs. To find out more about what friendly creatures can help protect your landscape, ask your ISA Certified SavATree Arborist!

Chinch Bugs

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August 16, 2018 – This summer season is bringing in more than heat; it is also helping Chinch bugs wreak havoc in many people’s lawns. Chinch bugs are often associated with open, sunny areas and, often times, are in groups of 150 to 200 insects per square foot. Chinch bug infestations occur in turf grass that is exposed hot temperatures, causing patches of irregular sizes to appear. If you start noticing patches appear on your lawn, contact your local SavATree Arborist!

Hydrangea and Coloration

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July 13, 2018 – Stop. Look at the beauty that is nature. Have you ever wondered how these hydrangeas, similar in a molecular scale, showcase varying vibrant colors? Hydrangeas are inflorescence and bloom in variety of colors ranging from blue to pink, purple, and white. This coloration is affected by the use of soil amendments; the more acidic the closer to blue the bloom becomes, and the less acidic the closer they become to pink or even red. So, how acidic is your soil? Have you ever had your soil tested? To learn more, contact your certified SavATree Arborist and find out all the cool things that happen below ground and how it affects your plants and trees!

Tree Braces

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June 27, 2018 – One of the first things I look at when I walk a new property is to scan the intentions and level of love given by the homeowner to their landscape sometimes it can take the forms of guying, stabilizing or rigging up leaning or falling trees. The problem is the monitoring of these braces ….most of the time they get forgotten about and the good intentions and the helping hands become a threat to the tree. I’d like to remind folks that support is just that Check it regularly to prevent situations like this from occurring. 

Red Thread

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June 21, 2018 – Have you noticed strange melting red tinted patches in your lawn? This almost appeared overnight throughout my territory particularly during the cool and heavy rainy period we have just experienced. My phone didn’t stop ringing. This is a turf fungal pathogen called Red Thread. Left unchecked, this can develop into large, irregular patches leading to die back and possibly an entry point for other fungal disorders, like patch disease. We have been treating this disease throughout my territory after our heavy rainy season with a regime of staggered curative and preventive approaches. With the help of my lawn specialist, Zachary Taylor, we have been both chasing this issue down. It’s been a challenge.

Skink Amphibian

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June 19, 2018 – Sometimes during Arbor Patrol you find some of the best friends helping you out in the garden; for example, the Eastern Two Lined Skink. This little behemoth is a garbage can monster who will eat beetles and many other insects that haunt and destroy our customers’ properties. So if you see my friend, make way and make room for he’s a helper and not an enemy.

Checking for Ambrosia Beetle

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June 14, 2018 – Have you checked for Ambrosia Beetle on your property ? this insect waits for no man. But Misha the Wonder Ambrosia Beetle sniffing dog is on the case and she’s currently looking for her arborist father to get on it and start searching your property.

Territory List:

Montgomery County
Cabin John
Chevy Chase
Chevy Chase Village
Glen Echo
Martins Add
North Chevy Chase