Philadelphia and its surrounding areas are home to many different types of trees, shrubs, and other plant life. Although many of the trees in the city are not privately owned, there are still many instances where tree service in Philadelphia is left up to individual homeowners. Those lucky enough to have trees on their property will, from time to time, need to have them examined and cared for to keep the trees healthy and their property safe.
Common Philadelphia Tree Services
Even a tree that doesn't appear to have anything wrong with it should, ideally, be examined once a year (and sometimes more often for younger trees). Just like an annual check-up for people, a tree's yearly examination is important to find small problems before they become large ones.
With the icy, snowy weather that is common in Philadelphia, tree service is necessary because the weighed down winter branches can pose a potential hazard to the property the tree is on. If you have a tree large enough to branch out over your home, its annual check-up will likely include some trimming and pruning.
A large tree that is having obvious problems is even more of a safety risk. If a tree falls in the forest, it probably doesn't matter too much where it lands (or, of course, if it makes a sound). A tree falling in an area as densely populated as Philadelphia will cause a lot more commotion, and probably some property damage, as well. If you can tell that a big tree on your property is having stability problems, this is considered a "tree emergency", and you should call for service ASAP.
Certified Arborists
When choosing a tree service, there are a few things to consider. First and foremost, you should make sure that you are dealing with a certified arborist. Becoming an arborist requires a fair amount of schooling, and to be certified, it must all be completed. Trees are living organisms, and when they need treatment, you want to hire someone who has had the necessary training to identify the sickness, understand the options available, and, ultimately, help you make the best decision about what the treatment will be.
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The Importance of Local Experience
In addition to being certified, the arborist you hire should have experience with local tree species. While all arborists must understand many things about many different types of trees, for Philadelphia tree service, Philadelphia arborists will probably have a better understanding of both potential problems and the treatments for them. Whatever is ailing your tree will most likely be something a local arborist has dealt with many times before.
Tree Service Costs and Duration
Since there are so many different situations that trees can present, the amount of time it takes to fix the problem and the money it will cost varies greatly (some situations cost $100 to fix, some cost 20 times that). In most cases, however, an estimate is free. You may want to get several estimates before you decide (in Philadelphia, tree service providers might charge very different amounts for the same service). Most tree issues can be resolved in only a few days, but some problems could require months of work. Make sure you get an estimate on how long the job will take in addition to how much it's going to cost. 
Jon Nunan is a freelance writer who draws on his experience in construction, ranging from landscaping to log home building, for his articles on home improvement.