If you have established trees in your yard, why would you want to remove them as long as they're healthy and growing well? If the trees are not invasive species, then you wouldn't need to remove them. However, if your home is old with a well-established yard, whoever designed the landscaping and installed the trees might have done so before some species were recognised as invasive. Unfortunately, there's really no grandfathering-in of invasives — they don't get a grace period that allows them to be considered non-invasive. As such, if you're thinking about redoing your yard, you need to start by removing invasive tree species.
These Things Can Spread
An invasive plant can spread quickly, choking out other plants. Even if you've been diligent about controlling suckering and cleaning up seedy messes, you shouldn't take the chance that you might miss something. If the trees in question have been a pain to take care of, here's your chance to remove a lot of work from your gardening schedule. Have a tree service evaluate what removing the tree would entail. Remember the stump and roots will need to be removed as well. The tree may have to wait until it's dormant so removing the tree doesn't drop seeds all over the place, but at least you'll get an idea of what needs to happen.
They Can Contribute to Pathogen Infestations
Invasive trees may carry pathogens that decimate local plants. Or, they may provide shelter to local pests, allowing the pests to proliferate and destroy local greenery. While careful observation of your trees and immediate treatment can stop a lot of problems before they ruin the tree, that's not always possible. Get the invasive trees out and look for either local species or non-natives that will not be detrimental to other plants in the area.
They May Not Provide the Same Nutrition or Shelter for Other Native Species
While invasive tree species might provide shelter for local pests, they may also not provide needed nutrition or shelter for animals that would normally nest in or eat from local trees. For example, a bird that relies on fruits from a certain local, non-invasive tree may find it harder to get food if the local trees are pushed out by invasives that don't produce the right types of fruit.
You might think that having only one invasive tree that's in good shape won't be a problem. However, issues will occur if the tree spread or if something happened to the non-invasives around it. Instead of increasing the risk of problems, have the invasive species removed, and plant local species that support wildlife and grow in harmony with the local climate. To learn more, contact a tree removal service.